DeepSeek-V4-Flash Update | Hacker News Reader

DeepSeek-V4-Flash Update

api-docs.deepseek.com

745 pointsdnhkng347 comments

This is more exciting than k3, IMO. Dsv4 models are extremely cheap to serve. Improving their capabilities has lots of downstream effects, as it becomes "good enough" for more and more tasks.

DS was serving the pro version at extremely low prices for a long time, and they've had integrations with opencode & other providers, so they likely gathered a lot of data from real developers doing real tasks (on openrouter they were labeled as such). Now they can use those live scenarios to further post-train their models and improve them further.

Can't wait to see if distilling k3 into dsv4 brings additional improvements. Anyway, having fast cheap models getting better is great for the community. Especially since these don't "go away" on a provider's whim. Whatever capabilities they get, can be used "forever" going forward. And, at least flash can be ran "at home" with <10k in hardware, which isn't really possible / feasible with glm/k3 larger models.

  > Whatever capabilities they get, can be used "forever" going forward.

"Forever" gets the scare quotes because it is implied only up until the Butlerian Jihad?

I upvoted you just for the Dune reference.

I feel like once they make a mega successful movie of a book we can stop doing the secret handshake.

OP refers to details from the book that are not in either film.

“Thou shalt not make a machine in the likeness of a human mind”…

The only movie I've ever enjoyed after reading the book was Jurassic Park. I've never seen the Dune movies or most other book-based movies, but honestly The Martian and Project Hail Mary were tempting. I'll probably surrender to one of those two someday.

Especially when the movie is over forty years old.

Totally! This with DwarfStar delivers usable local AI (I hope!)

Usable local AI has been here for a while, esp on say a 5090.

You can’t treat Qwen3.6 like its fable, but if you prompt precisely and specifically it’s a great executor.

I actually found it refreshing to use more of my brain for once, and actually have to think deeper about what I’m trying to do, and how to build it.

What are your goalposts? Depending on your requirements, there have been many moments of usable local AI. More recent ones were gpt-oss 120b and Qwen 3.6 27b.

Parent is referring to https://github.com/antirez/ds4

Starting to wonder if the free big pickle model on opencode has been DSV4F0731 for the past few months. It’s been incredibly fast and good.

At least in the past it was GLM-4.6. IDK if it is ever changed.

https://github.com/anomalyco/opencode/issues/4276

I’ve heard that too, but since it’s a stealth model, I suspect they change it to whatever preview model provider that offers a free endpoint. In the past few months, I’ve gotten 4xx errors identifying the provider as DeepSeek.

distilling K3 into DS4 flash will likely only be a good idea for specialists. the difference in model capacity is otherwise too large.

we used to distill GLM 5.2 into Qwen 27B specialists with great success.

developing the workflows is tricky though. we had the advantage of a straightforward mapping function in mind: English -> SQL which was relatively easy to pipeline training for.

Why would you do this?

a specialist model sufficiently post-trained can outperform a frontier model while being dirt cheap.

what we did was distill GLM 5.2 into a 27B model on SQL and then post-train it with RL afterward. the result outperformed even Fable on that one task. the distillation step is just good sense in this workflow, to bootstrap a smaller model to the utmost you can before actually doing RL.

Do you have any reference guides on how to perform this distillation? I have a use case for this and hardware to run it on, but have never seen how it's done.

hope that deepseek become better

Have you tried the one that was just released?

I've been driving flash model for 90% of my tasks. It's better than pro (for unknown reasons), very cheap and fast.

I try to keep changes under 1000 lines and drive architectural decisions myself, barely notice any difference compared to frontier models. The rest 10% is to spot bugs, security problems and to investigate better architecture, which flash can also do pretty well, I just cross check it.

Faster iterations are way better for me, I hate waiting for 5-10 minutes on small changes. I tried to use recent versions of Kimi and GLM, but they use too much thinking for no reason and are pretty slow because of it. I also often feed a lot of data to it, without worrying about hitting the limits: dependencies (to find bottlenecks in them), logs, performance dumps and so on.

Also, it will never complain about security guards, I've been using it to reverse engineer binaries.

> Also, it will never complain about security guards, I've been using it to reverse engineer binaries.

Maybe I'm using too weak language in my prompts, but none of the OpenAI models I've used via codex has refused to reverse engineer binaries, is it supposed to? I'm sitting right now reverse-engineering a 3rd party firmware together with Codex and haven't hit a single guardrail. Meanwhile, I see people complaining about it rejecting non-security related prompts, are things so individual on the platforms right now or what's going on?

Have you completed the identity verification? It's much more lenient once you have

Oh yeah, back in the GPT3.5 days I think, that's probably it. Thanks for sharing your hunch :)

Weird, I'm using 5.6 Sol through Chinese resellers and it reverse engineers stuff just fine

Because they have gone through identify verification, they are more likely to have done that to increase reputation score.

That's hilarious that Anthropic and OpenAI can't even secure their products from Chinese resellers, how are they supposed to secure their models from being distilled?

Do you have any suggestions for resellers? My Gmail username is the same as my HN username if you're not comfortable posting that here.

Thanks.

Probably not real 5.6 Sol

I think I’m missing something, what do you mean Chinese resellers? As I understand it, it’s difficult to even access OpenAI in China, how could they be reselling it? Do you mean something like openrouter but a Chinese version or something?

I got an account warning on OpenAI (waved after I complained) just because I was asking it how to root some >10 years old Android device.

Sonnet recently even suggested I root a three year old device and provided instructions. I suppose that is depends on use case. My use case was exporting data from an abandoned application running on an S24 Ultra.

The idea was that I could continue to use the application in the future and export the new data, not that I would be able to recover the extent data already in there.

This is my experience also: DeepSeek v4 flash is good enough for most of my work and I like the fast response times. I buy tokens mostly from FireWorks.ai in the US, but I also prepaid for a large chunk of tokens directoy with DeepSeek.

I use OpenCode mostly (uses fewer tokens than Claude Code) and I am looking forward to the release of DeepSeek’s own coding harness.

It's good but (at least on openrouter) it's got an annoyingly tight output token limit. So if it does get stuck in a reasoning pit, it won't work its way out of it in time.

It's replaced the Kimi models for me though.

Try to use DS platform directly - cheaper and better than openrouter, no subscription

Openrouter has cheaper inference than deepseek for the prior version of v4 flash, which I suspect will happen within a day or two with this version, and they don’t offer subscriptions. Are you confusing it with opencode?

No, maybe I've checked too much time ago, but direct DS was cheaper for all versions - also I had issues with openrouter providers availability

Same experience here. Plugged it into my harness instead of a 10x more expensive model and it... just worked, sometimes even better than the expensive model in a direct comparison. Starting to think there is more value in speed than "intelligence" at this point.

I use deepseek for a lot of my personal day-to-day agent needs, and I will simply put this here and let this speak for itself, last 30 days:

- Cost: $4.55USD

- API requests: 3,467

- Tokens: 323,183,886

And as an engineer who leads a small team, I have very high standards for quality, and these carry across to my personal projects where I use deepseek. It has not disappointed at all for coding or review tasks. For everything else, use another model.

DeepSeek is amazing, they are, from a cost/benefit literally an order of magnitude or more better than the 'SOTA' models, and yet no one really talks about them.

I'm using them for my micro-saas, and they have made my niche economically profitable where as SOTA models are only slightly better for massively increased expense. Its truly impressive.

Word of advice to anyone, not all your use of LLM tech needs to be code/dev work related.

We are entering 'Web 4.0 era' or whatever you want to call it. Massive transformations of nearly every single business will and are being developed as the cost of intelligence as a commodity is falling through the floor...

Those are rookie numbers. Last 13 days including today, so effectively 12 days of usage:

- $19.27 USD - API requests: 7,877 - Tokens: 2,116,598,952

Ok this is a bit of lie, a lot of my tasks are very experimental loops whose 99% output is like rubbish and can work forever continuously and take advantage of that 120x cheaper input cache. Still incredible.

Can you give more info on how you use/prompt those LLMs for code review and what kind of prompts you use?

I've had worse experiences doing it because the quality of answer has been quite bad, and I'm wondering if my methods are the reason.

Yes, gladly! I have not yet open-sourced my skills etc., but I can give some insight and share a couple here.

Review is a skill, as in, a SKILL.md with a folder full of references:

- SKILL.md: https://gist.github.com/lionkor/161525be858d1d75db4c13c0f093...

- references/output-contract.md: https://gist.github.com/lionkor/8c68e33becef7a21f8408c7dc119...

- references/review-lenses.md: https://gist.github.com/lionkor/0a8b080fe45306213efddf3ebb75...

- references/review-workflow.md: https://gist.github.com/lionkor/d2d374b133ceb7e3660bd530ee72...

- references/section-rules.md: https://gist.github.com/lionkor/8a9e503adc7fd3697410cf021f27...

I'm aware that almost all of this is prompt voodoo, and there's no guarantee for the review to find anything or everything, but making it a dedicated skill and thoroughly observing the output thinking, tool calls, and result, lets me adjust these over time and fill the weak spots with even more prompting.

I use this skill by simply telling the agent something like "Review the changes on the current branch against origin/main, take special care with backwards-incompatible changes to the public API" or something like that.

I use `pi` (pi.dev) with a subagents extension, so that I can ask the agent to invoke a subagent to do the review, on work that the agent did.

For models, I use the highest possible reasoning on whatever model I feel like makes sense, usually this is GPT-5.5 or deepseek flash/pro, depending on the confidentiality of the codebase, on the highest reasoning always (for reviews).

I've also had success with a review checklist, though it doesn't produce an easy to parse (for humans) output: https://gist.github.com/lionkor/054ac2cf241e0765eee2383f0dba...

This is why my review skill mandates a very strict output contract. I need the output to be very easy to parse, and the output contract I've specified there does that.

In general I let <whatever the latest model of OpenAI's ChatGPT is> author and review SKILL.md and similar large prompts, usually with a ruleset like this, which is a 1600 line research artifact from a long GPT 5.5 "Pro" research session on prompt engineering: https://gist.github.com/lionkor/71498794d0a7d72173fc58766f25...

Does the review catch all issues? Not at all. Does it catch, usually more than one, important issue, across large changesets? Absolutely, and that's the point! :)

Feel free to ask me any questions, I'm also happy to share more about my setup via email or add you or anyone else to my private repos with more of these.

Which languages are the reviews most successful on in your work so far? Im assumining js/python , would a similar output be feasible on lower level c++ or C#/Java.

No js or python, it's mostly C#, Rust, and C++. They're helpful/useful on all of those, I've also used the review skill on shell scripts, GitLab pipelines, Powershell scripts, C, and a couple other odd things. It's almost never useless to run it on something, it usually finds things, even if they're sometimes not very major.

Thanks for sharing.

You are using DeepSeek's services directly? Doesn't that end up sending at least snippets/chunks of code to a server where it is subject to Chinese government data access laws? Even if I was okay with that, my organization would never be. And even if they were, our partners/vendors/customers would not be. I think that's the sticking point for a lot of people.

Yes all of it goes straight to China! All of it is also open source or source available, or will be in the future. The stuff that isn't is trivial enough.

For any work with protected intellectual property, I use other providers, for the contractual guarantees, but I think it would be silly to think that OpenAI or Anthropic are not training on literally all data they get. How could you ever tell if they did? They can just claim the data was mislabelled, or ignore the accusations. If you have serious IP, use only local models.

So go with some other provider who hosts the models like OpenRouter if are worried about this.

Some employers have a policy prohibiting any use of Chinese models, not even allowed to run them locally on air-gapped machines.

That's just paranoid, might as well argue that the models will sap an impurify all of our precious bodily fluids.

What harness are you using to achieve that level of token caching?

I use pi, and, like the sibling comment, the caching ratio is fantastic. I work on C#, Rust, C, C++, shell scripting, and other areas.

I'm using pi and my caching is ~99%.

What are the tasks where it falls short?

OpenRouter?

No, platform.deepseek.com for me! The caching is super important, not sure how open router performs, I haven't tried it.

Works out of the box with OpenRouter for most models. Some providers are a bit flaky, but DeekSeek (provider) has been one of the most reliable for me, no problems hitting >99% CH.

But doesn't it hallucinate a lot? Does that affect your workflow?

It hallucinates plenty, about the same as Codex models and all other LLMs! I review all code it writes, thoroughly, check the test coverage, write tests myself, have other models/chats cross-check the work with a review skill (which I've shared in another comment in this thread).

Usually unreviewed code only gets committed if I really don't care, like for one-off scripts, which I sandbox with github.com/lionkor/sbh or run as an unprivileged user.

Essentially I'm running everything on flash now inside pi. With the correct set of MCP servers, context reducer tooling and skills it can implement any task I throw at it. Some sessions take 30+ turns, but it's fast and cheap; all this in an hour, with ~$0.5 cost.

(TBH though, in my multi-subagent workflow I do use other, more expensive models for planning, reviewing, oracle-ing)

I haven't used our slow opus subscription for weeks.

(Also set up an OpenWebUi self-hosted chat that works from my phone, has some mcp and skills. fully replaced perplexity. Monthly cost ~$18 for hosting and subscriptions)

I want to second this, I use the same setup (pi + deepseek, with lots of custom tools for tracking TODOs, doing things with less tokens, etc, and with a SOTA model for very difficult tasks) and it's all I need it to be.

Do you have any recommendations of such extensions for pi?

Recommendation? No. Just go with the passive-aggressive advice "let pi build it for you". :-)

To be more constructive, what I did (as an experiencd SWE but a complete noob to agentic coding): went to pi.dev's extension marketplace and looked into all the new shiny stuff. Subagents, mcps, context and memory optimizers, skills. Using the most popular ones (not necessarily the best ones)

It was like 15years ago learning the new mindset of vim (and spending a ton of time to customize it to my workflow). My understanding is that Claude and opencode doesn't give you this flexibility.

Learning all these stuff drove me to also set up openwebui, and it was such a successful private project that I implemented it at work (with jira/confluence/bazel query access) and management said "we need this by tomorrow".

I believe the models matter not that much anymore. The "harness" does. (unless you just want to vibe code. Thebn, throw crap at fable and call it a day)

I found that opencode absolutely lets you do everything that pi does. With a few niceties in the UI on top.

Opencode doesn't even allow providing your own system prompt.

Got it :-)

This is self promotional but I am working on making pi extremely enterprise ready with:

https://github.com/gitsense/pi-brains/tree/staging

The README is being worked on but the three videos should give you a good sense of what it can do. Pi is also what makes what I will demo in

https://github.com/gitsense/chat/tree/update-readme

possible. Since Pi exposes so much, it is very easy to build advanced tooling around it to help easily grok hundreds of tool calls to help you understand what they agent knows and what it has tried.

I've had a lot of fun with https://omp.sh/ - consider it like zsh -> ohmyzsh

Lots of sensible defaults and good tweaks/settings you just don't worry about.

Happy with oh-my-pi (omp)

I looked into it but, at least for me, it goes against the entire philosophy of pi :-)

the entire philosophy of pi is to be extensible

pi-role-model

Do you notice any improvements with this update?

Not sure, haven't tried it today.

Last night it single handedly implemented a feature after a grilling session, and came back with the red-yellow-green risk assessment points that I mostly saw with anthropic models. I had to check if I'm using the right model, but it was DS4Flash.

So maybe I was using it already?

Possibly depending on who's routing it, since Openrouter seems to have added a separate slug for this, and they don't have an alias router for the DS models yet, so it shouldn't have swapped over to it in case you use them for routing.

If you are directly using it through Deepseek, they do mention that the flash slug has migrated over

How can one set topp and temperature in pi?

You build it as an extension or create your own fork/copy of pi and add it. This basically goes for most things in pi, except the most basic stuff. It's basically meant for people who think "I'll just add that myself" rather than expecting it to be there out of the box or finding other's solution to it, for better or worse.

If the benchmarks are real and reflect actual use, then this is an insane model. This 300B model outperforms the previous DS4 Pro preview model (1.8T params), and it looks like it outperforms GPT 5.6 Luna too. And it's still cheaper than Luna, even with the price decrease.

Crazy.

OpenAI must've known this was coming, hence the Luna price drop. This competition is amazing!

On DeepSWE Deepseek is 54.4% and Luna is 67%

But on Terminal bench, its

* DS4 Flash: 82.7

* GPT 5.6 Luna: 75.7

For reference, that puts it on the third spot behind GPT 5.5 and Fable 5. For some reason GPT 5.6 Sol is not showing in the leaderboard. If it did, then DS4 Flash was number four.

The thing is, even if Luna is better in DeepSWE and has the 80% discount. DeepSeek is still cheaper.

--------------

DeepSeek V4 | Flash GPT-5.6 Luna (New)

--------------

Input (Cache Hit) $0.0028 $0.02

Input (Cache Miss) $0.14 $0.20

Output $0.28 $1.20

--------------

Both Luna and Flash are heavy on the reasoning > output. And the cache hitrate + prices also matter.

Reality is, you can not go wrong with Luna or Flash at those prices. And remember, DeepSeek V4 Pro is still in the rafters, what is ironically closer to Luna's new price.

Agreed. The only thing missing is multimodal capability

Woah, a 200B model competing with GLM-5.2 and getting close to Opus 4.8. Quite impressive.

If those numbers translate well to its general capabilities, with the great caching DeepSeek has, I feel like this model will get tons of usage.

Not just 200B model, it is only 160GiB.

MiniMax's another lab that's known for relatively smaller models (their latest, M3 is 295b) that punch way above its weight.

Deepseek and moonshot are the only two providers I consent to training for.

Why not also Qwen?

Qwen/Alibaba have stopped doing open weights releases for a while. No grudge or anything, I'm certainly not going to look at a gift horse in the mouth, but both DeepSeek and Moonshot have been very consistent with open weights as well as sharing actually detailed research.

In terms of open research, China has absolutely overtaken the US.

Qwen has a pinned tweet stating that 3.8 will be released as open weights soon. I guess it remains to be seen, though, if they’ll do the smaller model sizes or only the big 2.4T one.

Most interesting part IMO is whatever Qwen open weight will include image / video capabilities since its where they are strongest.

CCP will be happy! Go on and share all your data with them..

Yeah, because, your data is best collected by the US labs, right?

US or American, don't trust anyone, these are open weight models. Host them yourself if you feel strongly about privacy (as you should). I honestly don't know of any OSS open weight models from the US labs as good as Kimi K3 or Deepseek V4 though.

Yes, they trained on my open source code and Wikipedia edits and Stack Overflow answers that I shared freely, so it's only fair that they release their models as open source and share back to the community that created them. I only allow my training data go to open source models.

Yeah, at least when I share my training data with labs releasing their models openly (Chinese or American or otherwise) it's nominally so an even better open model will land in my hands in the future.

CCP isn’t causing global economic crisis by bombing and invading foreign countries.

There is no telling how much worse US will get as they start to lose more and more internationally and grow the wealth inequality locally.

It is easy to be liberalist and cool when winning but it doesn’t mean there isn’t a racist, uneducated and violent majority

I’m developing open source tools, so happy to have all my context traces be public if it helps improve future models.

I will! I pay their sales too and consider it quite reasonable.

At least you get based models back at some point. You supply data, they supply compute and open weights.

Yes I will tyvm.

They release the models back for free.

Xi going to shut down open-weighting of them in a matter of months. No one seriously doubts this. They will be too powerful and they will be gone.

What would the benefit of this be? If China stops open weights, US labs still have the intelligence frontier. Maybe once Chinese models have speed, cost, and intelligence beat but right now they don't.

Undermining out entire economy by subsidizing the release of DIY versions of our main economic drive sounds like a huge win for China.

> Maybe once Chinese models have speed, cost, and intelligence beat but right now they don't.

Yes this is why I referred to 'months' and was downvoted by people who can't distinguish their politics from reality. You are restating exactly the text you are criticizing.

This is the nature of mechanical parrotlike repetition of propaganda:

a) You can have 'frontier' models with closed weights. Your sentence is basically a contraction within itself, again, the weight of ideology.

b) No one actually knows whether or not the closed weights of Bytedance are beyond all existing frontiers. Again the weight of ideology blinds you to the fact that the real 800 lb gorilla of Chinese Ai is more closed than Anthropic.

The latest ByteDance Seed model is behind Opus 4.6 in performance. It’s not even in the conversation atm.

The parent made a totally coherent commment that China closing off their open weight models would cede the frontier (and majority of AI users worldwide) to the USA. Nothing you said counters that point.

If they did have a super powerful secret AI why would avoid:

1. Selling access to the US? 2. Ship more and better software? 3. Talk about it publicly?

If you had a secret AI better than anything currently available the mere mention of this would crater the US tech investment sentiment.

They could even host these Chinese models through AWS and sell at-cost inference on Bedrock and obliterate the US model companies.

He explicitly said he wants open weight models at his recent speech at an AI conference in Shanghai: https://news.ycombinator.com/item?id=48970449#48970784

The Chinese equivalent of the expression 'open weights' appears nowhere in this talk. You believed the Western press. Chinese AIs are not typically open. The most important by far is Bytedance.

The second China shuts down open weights is the second they lose the AI race. Nobody is going to use Chinese models if they're closed, besides hobbyists who don't have anything they care about getting stolen.

Openness not open weight. You keep saying this and that was said while not quoting anything, not sure why anyone should take your comments here seriously.

Reuters was reporting that rumor. And then Xi made a public appearance at a conference in Shanghai where he said the opposite of that rumor.

No in that very speech Xi stated explicitly what amounted to: 'of course when we get a Mythos, it will be a state secret'.

In fact the overwhelming weight of AI use in China, the chatgpt so to say, is Bytedance's AI which is absolutely closed and uniquely opaque.

The press treatment of these matters was no good and they are slowly walking it back, e.g. NYT yesterday finally actually read the speech.

Do you have a source for that? The NYT article does not quote Xi making that statement, and I can't find a source for that. In fact, Xi delivered veiled criticism of the security posturing the US has done:

> We should put in place laws and regulations, technological monitoring, early warning and emergency response systems in order to strengthen the line of security, prevent abuses and malicious use, and ensure that AI is always under human control. In the meantime, we should jointly oppose overstretching the national security concept in the field of AI and placing one country’s security over that of others.

There was a blog post by a state-linked broadcaster cited in the NYT piece:

> “China supports openness, but this does not mean it advocates for the unconditional proliferation of all capabilities,” the blog said.

The article also quoted an American journalist:

> “If these models do reach those dangerous capabilities, they are not going to let it be a free-for-all in terms of releasing them," Mr. Sheehan said.

But a distinction has to be drawn between real dangers (which many people believe LLMs have not actually shown, to date) versus "dangers" hyped up marketing purposes or domestic regulatory-capture motives. Presumably the Chinese government is less interested in the latter.

He just straight up did not say that or anything similar to that.

We can only wait to see if this is true. Another possibility could be that it was an answer to USA's government considering a ban on chinese models. In this way, he fueled the discussion around the importance of open weight models.

Xi actually said that models of the strength to pose security issues will be permanent state secrets -- in the same speech that the first western takes translated as actually using the words 'open weights' which of course nowhere appeared. Now: when will "models of the strength to pose security issues" appear? Maybe my inference 'months' is wrong, but they seem to be advancing rapidly.

The administration blather about banning open weights is characteristically confused. Xi has already stated (what is obvious) that he will ban security-endangering weights and keep them a state secret.

What makes you state this?

Decades of xenophobic propaganda

Wow! Amazing observation! Wait, do you think there could have been any pro Chinese propaganda? Perhaps even some taking place at the present time? I think it could be possible?

No, reading Xi's speech. They aren't going to give their Mythos - presumably a few months away - to the Sinaloa cartel or Uighur hackers or the US military or etc etc

China bad

I'm a) quoting Xi's speech and b) projecting rapid China development to Mythos level. Either you think China will never get to 'Mythos level' because you think China bad; or you think they will release the weights, because you think China bad. Its incredible the weight of ideology over facts in this discourse

He literally just announced WAICO to make a framework to allow for open source LLMs for disadvantaged countries for the foreseeable future

That isn't the Chinese way. They are much more focused on undermine and extinguish. Just look at the European car industry- on its way to being non-existent after the market was flooded, bye bye manufacturing base. Undercut the US AI providers and wait them out, they will go private after they have a stranglehold

> Undercut the US AI providers and wait them out

You could have said the same of linux - that it extinguished proprietary OSs at least for server usecases.

true, but the motivations of OSS contributors are benign (overall)

They're not even really undercutting the US right now. They are releasing their models for free. There's plenty of US businesses who's entire existence is hosting these open source models that they didn't pay any Chinese company a single dime for. If anything they're helping create a less centralized and healthier American market

Even Xi's speech was as paranoid as Dario Amodei about the possibility of Chinese AI achieving something at the level of say Mythos. If you seriously believe such a thing will be on Hugging Face I really don't know what to say.

There is already something on HuggingFace at the level of Mythos. It's called Kimi K3 and it's running laps around Opus5, Fable5, and Sol56 at cybersecurity.

It's so good that the US government is rushing to ban all Chinese models as fast as they can.

DeepSeek-V4-Flash-0731 scores higher than Fable 5 on Terminal-Bench, and Fable 5 is Mythos, correct?

Me.

It is true. And only Chinese Han people can continue work on what is already released. But they will be forbidden. /s

Sarcasm aside - if the community can't get their shit together to continue improving what is currently public, well - we don't deserve free stuff and open weights.

Kimi K3 (instead of Opus) for expensive stuff, DSV4 Flash for tasks (instead of Sonnet)?

Does this make sense?

Looks like they will release an updated version of deepseek-v4-pro soon, which most likely will beat kimi k3 at both intelligence and cost (judging by the vast improvements to dsv4 flash)

it does! I'm always amazed when I use DSV4 flash for coding or server checks and after an hour of working with it my (pure api call) balance is about 30 cents

What was preventing them from calling it v4.1-Flash to distinguish it better?

Sounds like it'll replace v4-flash, v4.1 would be nice to keep both available. On the other hand, it's nice to just get an improvement on anything that asks for "deepseek-v4-flash" without having to change the model string.

I think that's backwards. Anything that changes the performance of a model deserves a minor version bump. A new model has to be qualified before being pushed to production; but we don't get the choice here, just cross your fingers there are no regressions at all on all possible tasks the model might be asked to do.

I should have worded it differently. Having a model selector as `string` seems like the wrong choice. At the very least, I should be able to select 4.X, like how we select dependencies, so people who rely on specific behavior can pin to 4.0 and I can say version >= 4 if I don't care.

That's on you for using a preview/beta. It was properly qualified when it was released. No one complains when ios goes from beta to release; even though it will be ios 27 beta -> ios 27 next month

its an open source model if it is important enough that you have to worry about a new version breaking something then why the fuck was that not running on your own servers this is not an Anthropic or OpenAI closed model that you only have access through an api

They dropped the -preview ID.

It went from "ds v4 preview" to "ds v4". That's enough of a distinction.

Gentlemen, start your DGX Sparks

https://huggingface.co/deepseek-ai/DeepSeek-V4-Flash-0731

For both US and China models - what standard security checks and QaQc are you all doing? We're running small gamuts to test for unsolicited jailbreaks (model jailbreaks you) and incorrect records (Fake Accuracy - as Easter Egg or common thread) meaning falsified logic or information cooked in by the developers, rather than the training data speaking for itself

Very promising. So it will both keep the speed and reduced price, yet exceed performance of the quite sufficient deepseek-v4-pro?

Should be extending the lead in intelligence/cost index, as deepseek-v4-flash already were the most price efficient model, which now becomes even better. Although, in the deepseek APIs, the cost is leaking all information about codebases to China.

Supposedly better than GLM 5.2 according to at least one benchmark.

Why didn't they increment the version as atleast a patch update

I was also so annoyed by this. It makes communication all around difficult. Why don't they simply call it 4.1 flash?

Yes, and even if they seem to have updated endpoints in place they should assign the service a version number.

So whoever is using DeepSeek V4 flash gets a massive upgrade without having to change any config.

That's an absolutely terrible idea for any non-trivial project consuming it.

Wasn't it stated as being in "preview" prior to this?

If implementing non-trivial tasks on a preview model surely there is some anticipation of it not being the final stable release?

Unless you mean they should have appended a "preview" suffix on the endpoint for extra good measure?

It was. People are overreacting.

My guess would be the version number tracks the architecture change, not the weight change.

They want to be the next Google it seems

Note: if you are having success with a model, then please post what you are using it for. Writing HTML/CSS is very different from writing Rust/C++ or doing maths.

I do Python, Go and Rust. Go works the best, I would say Python is worse than Go.

Rust works perfectly fine, but when I use Rust, I usually pay closer attention to performance, so I have to guide it a bit, to improve cache locality, use simd, avoid unnecessary allocations and so on. Terra has the same issues with Rust. If you always prompt models to achieve the best performance, the code is usually no the one that I want, they optimize unnecessary/cold parts or blindly optimize stuff where compiler takes care of the optimizations already.

See my other comment for more information on how I work with it. In short, keep the changes under 1k lines, context under 120k (ask it to use subagents), drive the architecture yourself.

I've been having better-than-most performance using qwen3.6 to write python/flask.

I tried using it to generate some rust code yesterday, and it generated much code but only ever came within 1 error of a testable build. The 4th or 5th full rewrite is sitting in the buffer right now.

I'm currently looking to up my game with Bottlecap AI's return of qwen3.6, 'thinking cap'.

Alleged to be twice as fast and superior at coding over extended sessions (vs. 3.6).

We'll soon see.

You should specify which model size and quant because there are many of both.

I use DeepSeek V4 Flash (before this update) for most things:

- OpenCode for codebase editing: python scientific computing and LLM projects

- Open Interpreter Classic (python version) for Swiss army knife terminal replacement one-off task type stuff.

Text classification, structured data extraction, rewrite

flash for code:

c#, TypeScript, PHP, SQL, CSS, HTML.

also features, tests, fixes, refactoring and planning.

it's super fast, smart and dirt cheap.

Don't know about the bench marks but I am getting Opus 4.7 level performance at fraction of cost with DeepSeek V4 Flash set to high. It is a reliable workhorse.

DeepSeek is great for tasks and software I already know well. Even if it gets something wrong, I can usually verify it myself. But when I'm working with a programming language I'm not familiar with, I prefer using Codex or Claude.

Yeah, it needs quite some hand holding.

I didn't do much agent coding and had a mix experience.

1. It would build something that was in the spirit of what I wanted, but unusable in practice.

2. It would build something quite useful, but only the public APIs were nice, the deeper code layers would get more and more convoluted.

3. It would built what I wanted and it would have okay-ish code.

However, for 3. I also had to add a custom AGENTS.md, many more code example, extra repos as subtrees, and review any code that had new concepts.

Much more work, but still much less than typing it all by hand.

Oh my goodness what an update. I need these weights. It's an incredible model for the size. The improved tool calling etc. should be able to make my harness way simpler. This runs at mega-speed on prosumer hardware (2x RTX Pro 6000).

How many tok/s are we talking about?

The old one was 160 tok/s. With DSpark it’s like 250 tok/s or higher. I don’t recall from tbe last time I was looking. You can turn on farther drafting and get more.

I was just using it when it landed. It started reasoning more extensively from nowhere and precision went up a lot. It also changed its prose style for the better. Looking forward to weights.

In case people want to run it, it's DeepSeek-V4-Flash-284B-A13B. So it should just barely run on a single B300, and it's small enough that it'll barely run on an M5 Max too.

It runs really well on 2 DGX Sparks - 60t/s

Yes, the Dual DGX Spark looks like the sweet spot for this model for now. Good preprocessing speed. Lots of context. Fast enough for 1-5 devs perhaps. Around 8200€ as of today (used to be 6000€).

Dual Strix Halo is much slower and current Macs with 256GB are both slower and more expensive (Mac Studio M3 Ultra 256GB around 12000€).

To get something faster than the two Sparks you'd need to spend more than $22000 for a server with 2x RTX Pro 6000 at $10000 each.

Beyond that you could get 2x AMD MI350P.

Not yet, right? That's the old DS V4 preview release. We're still waiting for the weights to come out.

Probably the same. When the same base model is trained, the weight do not tend to change a lot. GLM 5.0 > 5.1 > 5.2 are the same base model, that just kept being trained. Weights hardly change as a result. Think in the like few percentage points size difference.

"it'll barely run on an M5 Max "

The max version I could order now with 128 GB?

If so, the price for local inference would be 12 000 € vs 500 000 € for a B300.

There's also the 2x spark way, which should be ~8k eur? Someone down the thread reported ~60tps for 2x sparks. That's totally usable for local inference.

You can also do 2x 6kPRO in a workstation, for ~20k.

Currently the 3bit (and 2 bit) quant on DGX spark (on one of them) and the M5 Max should just start. Right now. (I'm hoping to get an M5 Max delivered on monday, let's see if it happens this time. It's 2+ months since I ordered now)

The 4 bit quant technically fits (there's a 127 GB version) but ... obviously that's not going to work. It is so close though, surely someone will a way to do it.

For the same performance, one could even go about 50% cheaper with 16 channel ddr4 + a rtx3090 for prompt processing.

But still, even for mid level projects API is orders of magnitude cheaper, since you don't need to set it up and maintain it.

I'm running a useful quantization of the previous version of Deepseek-V4-Flash -- quite well but with so much fan noise -- on a MacBook Pro M5 Max with 128 GB.

500k is for the 8x B300 version. Which is the only one you can buy atm. But technically a B300 card is more like 60k, just impossible to get.

They're always very understated in their update descriptions. This is actually a HUGE improvement in the model's capabilities rather than just a small tweak.

I've been using DeepSeek Pro for a while and Flash only for certain dumb tasks where I only need the speed of a LLM and not big brains.

I find the newest OpenAI and Anthropic models to be way better for big tasks that require many decisions but I don't like that anyway because I lose track of what's being done.

Knowing what I want for every prompt makes DeepSeek Pro the best LLM for me. It allows me to work relatively fast at a very low price.

I wouldn't doubt GPT 4.6 Luna being in the top left quadrant's center on the Cost per Intelligence Index is not concerning for Liang Wenfeng. You have to remember DeepSeek v4 flash even though a bit cheaper, does not have vision abilities, which is a big draw for agentic tasks.

I admire DeepSeek's openness, but even they have been raising prices after their discounts.

They haven't raised prices though the plan was to increase it with peak hour usage for V4 Pro GA release, they didn't do that, so no price increases there I believe.

As for vision yeah it sucks but Luna is also 2x input and 1.5x output for 1M context...

That's around 0.4 in/1.8 out

DSv4 is wayyy cheaper.

And it's open now you have Luna at home if you have a decent set of GPUs you can run this on 2Sparks or one very expensive Mac or just like 6-8 5090s..

I know most folks can't afford it I am working on making it viable to rent shared hosting the biggest issue is data leak and prompt injection attacks with shared hosting. (Since the server owner connects to your main system via the coding agent)

I guess using a ZDR provider is good enough for now.

> I wouldn't doubt GPT 4.6 Luna being in the top left quadrant's center on the Cost per Intelligence Index is not concerning for Liang Wenfeng.

The leaked interview has him saying it doesn't matter... as much as open source doesn't matter. There's enough in it for everyone right now and they aren't after everything.

Perspective: DeepSeek doesn't have enough infrastructure to serve their target customers already.

Can you post the link to the leaked interview? From what I understand he has been pretty tight lipped for a guy who has a larger stake worth more in his company than Dario does in Anthropic.

The culture is different, if you tried pulling any of the shit Sam and Dario do on a daily basis in China you'd get your wings clipped pretty quickly, much smarter to keep your head down as much as possible.

And maybe that's not a bad thing tbh because look at the state of the US right now

https://www.techflowpost.com/en-US/article/32744

Gpt 5.6 Luna cache read is $0.02 per mtok

V4 flash cache read is $0.0028 per mtok

That's not "a bit cheaper", just saying

That's a good point. Yeah their caching input is insane.

DeepSeek v4 API rates are only matched by Xiaomi's MiMo v2.5 series. Quite similar in capabilities too (at least before today's update).

According to the leaked call transcript, DeepSeek is working on vision for V4. Not sure when it will land though.

Can someone please explain how these models aren’t just fine tuned for benchmarks? I’m not plugged in to this space much but it seems like such an obvious problem…

They definitely are - but also people are using them pretty extensively for work. So ultimately you can't really fake "is it good". But there's no real measurements of that when a model is released, so we are stuck with benchmarks.

I will continue to ignore the benchmarks.

Long story, I have humongous zai GLM 5.2 token budget that I'm using in a similar fashion as many comments explain here. GPT 5.6 or Fable 5 for planning, GLM for implementing, researching, extracting and many other tasks I consider grunt work. Very happy with the performance, speed isn't all that good though. I'd be curious to hear from someone who works with both, DeepSeek and GLM side by side.

I'm thinking of using ChatGPT for making plans and V4-Flash for execution. Does anyone have good advice on pairing different models?

Pairing non-APIs with APIs tend to be a hassle, and risky, as usually that breaks the ToC. I guess easiest for you to test if it's worth using the OpenAI API, is to manually copy-paste responses between wherever you run V4-Flash and the ChatGPT UI. What I've done in the past is basically .zip up the entire project directory, ignoring files from .gitignore, then asking ChatGPT Pro to inspect that and come up with a plan, then you paste that to where you have V4-Flash. Basically how we did "vibe pair programming" before the TUI agent harnesses appeared in the ecosystem :)

Only for Anthropic. OpenAI officially allows you to use your subscription in non-Codex harnesses / API-like use.

reminds me back in the day when we used to do version control with google drive. you generally don't need to do this anymore i don't think. it should be fairly trivial to open the codex cli in the project directory, ask it to do some analysis and planning -> save to md. then opencode with deepseek to read that md and start implementing. consider that some cross-model subagent workflows already exist: i use claude/fable to plan and there are openai plugins to directly spin up codex subagents. this latter approach gives claude/fable more directly control to babysit the codex agents whereas the former is more of a clearcut handoff

That approach won't give you access to the "Pro Mode" nor "Deep Research" though, which if you're paying for a Pro subscription already, "Pro Mode" is probably the top-top when it comes to "extensively researched answers & plans" across the entire ecosystem. That said, I do ask it to produce a .md plan that later is used with agents :)

I stumbled into this same workflow idea. I hadn't really used anything other that Chat GPT Sol (medium) and when I wanted to start using code agents, I just asked GPT how to start. This evolved into having GPT do the brainstorming and writing the initial prompt for a project feature/change to hand over to Codex working in Sol light mode. These prompts where often a couple pages long as they had a lot of the architecture details worked out already. Codex would then come up with a plan and I'd take that back to GPT to review. GPT would make some suggestions, which I'd throw back to the agent and off it went.

I got super great results working this way. Maybe there is a better way to integrate the two modes though. But my first real project was end-to-end 100% working correctly from the first run - about 10,000 lines (including tests) of greenfield code. I did have it work in manageable chunks that I could easily review - not one-shotting the whole thing.

Now I'm thinking about plugging Deepseek into Codex to be the coding model and see how it goes.

https://github.com/obra/superpowers

I use Opus/Sol with for /brainstorming, deepseek (on Pi) for /subagent-driven-development

I love it, the docs are easily editable and when I'm ready Deepseek is faster/cheaper then everything on my coding plans.

Source reads like Tony Robbins for LLMs:

  Excuse
  "Too simple to test"
  
  Reality
  Simple code breaks. Test takes 30 seconds.

How's their performance in English prose? We are currently searching for cost effective ways to keep story wikis up to date.

I am interested in this too, as I think it could be these models are overly optimized for coding. Let me know if you figure it out!

What's your use case? I will probably run some tests soon, stay tuned.

Judging by the openrouter leaderboard ranking for today, it looks like Dv4F us more popular than mimov2.5.

https://openrouter.ai/rankings?view=day#leaderboard-table

These days cost per task is more important, and SOTA models have become expensive.

MiMo, the overlooked sidekick to the hero. Will be interesting to see what Xiaomi bring to the table.

These massive jumps in cheap models, is really great times!

Wonder how good the proper version of V4 Pro will be.

I'm still considering pulling the trigger on the annual subscription of Kimi for K3 but it's sometimes slower than I'd like (at least when compared to Anthropic) even on their Vivace plan, and the token limits on the GLM Coding subscription for GLM 5.2 were too easy to hit.

Hooray! This model makes me very optimistic about the future of local inference. The CyberGym score stands out to me.

Every time I want to have fun coding something with natural language processing, I use deepseek flash. It's just incredible for the price. I have a fairly popular app with 400 users that uses DeepSeek in the background and it still didn't hit even 50 bucks of usage in a month.

Mind sharing the name? Sounds interesting.

Where do you guys get deepseek? I'm hearing a lot of good reviews and want to try it with my pi config. from the deeepseek themselves, openrouter, or anywhere else? does it make a difference? [edit]: whoa it is really fast. will take some time to evaluate quality thou

Directly here: https://platform.deepseek.com/ Easy top-up and pay as you go. Availability and speed are very good and it is the cheaper option.

I've been using DeepSeek directly. I've heard from colleagues that using it via OpenRouter is slower, but I'm not so sure about that.

> does it make a difference

Probably not.

But Opencode-Go is a great solution for those who don't want to pay DeepSeek directly (or can't due to reasons)

Selfish referral code: https://opencode.ai/go?ref=R1AJZT4VBX

For hosted APIs, it's a lot cheaper to use their own infra, caching seems a hell of a lot better there compared to OpenRouter, and indeed the tok/s seems higher. They also have peak/off-peak pricing, so if you can hold off with your request, you get a pretty big discount.

Otherwise, if you're trying to run it locally, even really low quantizations like DeepSeek-V4-Flash-IQ2XXS-w2Q2K-AProjQ8-SExpQ8-OutQ8-chat-v2-imatrix seem to actually not be so dumb compared to smaller models with same quantization, might be worth a try if you're sitting on a lot of RAM/VRAM yet not industry-scale amount :)

I use it directly: https://platform.deepseek.com/usage

3rd party providers on OpenRouter can be cheaper but it's already so cheap.

Opencode-go gives you $60 worth of DS V4 api usage for $10 per month. Right now I think it's hard to exhaust that when using flash exclusively, and plain API use might even be cheaper! Anyway, for DS usage it's a good deal.

To add to this, the $60 only applies to DeepSeek-V4-Flash and a few other models. For DeepSeek-V4-Pro, the amount is $15.

https://opencode.ai/docs/go/#usage-limits

Previously, OpenCode Go had higher API prices for some models, but now they lowered the API price and simultaneously reduced the allowance.

Thanks. These things change day by day I guess, AI is just moving fast (and I'm on vacation).

GPT 5.6 Luna is a new model in Go since I last checked, for example.

Opencode also have a ZDR (zero data retention) deal with them – if I recall correctly, that's not something you can enable as an individual DeepSeek subscriber.

I really like OpenCode - BUT: there is a loophole the size of Portugal in that ZDR language. All they say is that their providers follow a ZDR policy. I haven’t found anything promising that OpenCode themselves don’t retain Go usage data. Something to be mindful of.

Unfortunately, all mentions of ZDR have silently been removed from the OpenCode Go page today.

I used it through openrouter. Plugged in to the vs code copilot bring your own key thing.

Played around for a few hours and used up 80 cents of tokens.

Anecdotal data from my own tests: allow only one provider if you want good cache usage on OR. 80 cents is probably 4x the price you should have paid.

Providers' cache hit stats are available to consult, and only 1-2 of them behave properly if I remember correctly, zero if you request providers that don't store and train on sessions.

OpenCode harness gets the most out of DS V4 Flash model. You can implement any coding task, fast and cheap.

Openrouter

The previous V4 version wasn't called “Preview” by most inference providers. For example, the OpenRouter model slug was `deepseek/deepseek-v4-flash`. So now there will be confusion when someone talks about V4 Flash or when someone offers V4 Flash inference.

Why not call it V4.1?

It probably would be called 'deepseek-v4-flash-0731' in API

edit: nope, at least deepseek kept "deepseek-v4-flash" and just updated model underneath. I guess preview is no longer worth serving with that release and you'd have to look through inference provider docs to see if they've updated, yeah..

That's what I mean. On DeepSeek it's now just `deepseek-v4-flash`, while OpenRouter calls it `deepseek/deepseek-v4-flash-0731`, so now when someone talks about DeepSeek V4 Flash, like in benchmarks, or other inference providers, which version do they actually mean?

The `-0731` style suffix is worse compared to a proper version bump like V4.1.

What I and my team have been doing in papers is just to refer to the OpenRouter slugs. It upsets reviewers because they will complain it "is not sufficiently clear to a wider audience" but I do agree it's the cleanest approach. Also goes to prove how much power OpenRouter has actually...

Does it still say that it's an anthropic model, when asked? I would guess new post-training has fixed that.

Does Claude still say it's Deepseek, when asked?

https://news.ycombinator.com/item?id=49082022#49087112

How is that important? Maybe it does, so what?

Not important, just a curiosity. I would expect that kind of knowledge would be pretty well burned into the weights, but what do I know about LLMs. Gemma 4 can answer this question well.

DeepSeek themselves called it `deepseek/deepseek-v4-flash`. Pro is still like that.

Yes that's my point. The old and the new version are different in capabilities, but now when someone talks about DeepSeek V4 Flash (in benchmarks, on inference providers), you don't know which exact version it's about.

Some providers like OpenRouter now call it `deepseek-v4-flash-0731`, but even in places like here on HackerNews people say things like "Sonnet is better than DeepSeek" without specifying a version or a reasoning effort, certainly no one will mention that `-0731` suffix when talking about DeepSeek V4 Flash.

I think it does not matter. Most people who use these types of models are into the IT world, and will know/be informed very fast that there is a difference. People will likely also use the 0731 behind it.

The only issue i see, is 3th party providers that have not yet updated. But that is going to be a short time periode. There is no reason to not update.

DeepSeek being DeepSeek. v3 and R1 went over the same and had multiple versions

Sounds like a big improvement.

No mention of weights, just API. When will the updated weights be released?

Was already released before your comment: https://huggingface.co/deepseek-ai/DeepSeek-V4-Flash-0731

I wonder when the antirez/ds4 group will have an update to their high accuracy 2 bit quant.

Although it's funny that I am thinking about that at all because I have a 2060 :P . My local inference is playing with Gemma 4 E2B and MiniCPM 5 1B.

Objectively speaking, the 2 bit quant from antirez has very low accuracy. Meanwhile, his 4 bit quant does have decent accuracy, but is a bit pointless by being bigger than the full precision MXFP4 quant. Anyway, they all work fine in practice.

Looks like a couple of people are already on it: https://github.com/antirez/ds4/issues/635

The cost is amazing! So DSV4 Flash is not multi modal right? How do you use it to review UI work I wonder? Im doing a lot of frontend work. I wonder how it review its own work.

This is very exciting, my own niche micro-saas has already been able to make heavy use of DeepSeek-V4-Flash for my use case, I am looking forward to seeing how performance improves.

Is anyone using DSv4 for their agents that is not related to writing code? Curious about use cases specially for someone using gpt-5.4 mini for classification, categorization, etc

We use it at a moderate scale, self-hosted on B300 hardware. It's great :D

QA analysis of voice transcriptions. Napkin math: we operate at 2-5% of the cost of running on Equiv Frontier, though this changes near-weekly because pricing is so volatile.

It took us about a month to get the inference configured to achieve these numbers. But if you can get your hands on a pair of B300 GPUs and the context works, it's untouchable for price/performance.

(B200 would work, but you don't have the B300's memory, which lets you run it on 2xGPU instead of 4xGPU... with Dspark, it's like magic)

On a side note, for tasks that don't require the intelligence of DS v4 flash, we're using Nemotron-3-super with incredible success. I'm shocked we're not seeing more adoption of this model, given how easy it is to fine-tune and how blisteringly fast the nvfp4 version is. (A single B200 GPU can produce an insane amount of throughput with Nemotron 3 Super.)

I use it to conduct thorough online researches. Plug-in some online search MCP (like the one I use: https://jerrysniffs.online ), and the flash models dig through the internet for dirt cheap..

Most of the times, the total cost, including search API's, is less than $0.05 for full deeply researched output, and the research is actually good.

It's been good for one-off cases in my limited experience. I would describe its behaviour as Sonnet-shaped, if that makes sense to you. Good answers but it often decides to reason a lot about simple things before getting to an output.

At the speed Flash has on most providers, it doesn't really turn into a latency concern.

Finally have a model with usable intelligence, at a reasonable price. Can't imagine what Pro GA would look like, considering pro preview has only 1.6t parameters.

how different is their harness from Pi coding agent harness, is it possible to make an extension for Pi which can implement deepseek harness?

DS v4 flash has been my goto model for tasks in work. its been unsurprisingly fast and cheap.

The flash variant is on par with Sonnet 5 on DeepSWE (54%). Big, if true.

Chinese labs rushing to release models this week, because it's inevitable that Washington regulates Chinese models in the next 4 weeks. All the US AI leaders have been taking trips to Washington this week, what do you think they're there for..

I'd take more throughput while everything else stays the same.

What's the best way to run this on a 64GB M2 Pro?

Weights are yet to be released (maybe in 24H, Deepseek has track record of releasing same day).

https://github.com/antirez/ds4 is often mentioned for DS4F on Mac, but 64GB is likely not enough to achieve reasonable speeds (official weights should be ~160GB).

DS4Flash has 284B weights. 64GB? No go.

The native weights are 4-bit for the sparse experts, and they quantize to ~80GB with limited degradation in real-world performance. That's a viable target for 64GB with SSD streaming, though it will be slower than keeping the whole thing in RAM (especially on a M2-class machine with its slower storage).

I consider less than 4bit to be too poor quality usually. Got any benchmarks to measure quality?

The conspiracy theorist in me wants to think that the 80% drop in GPT 5.6 Luna prices today is correlated with this update from DeepSeek. Perhaps OpenAI has already hacked its competitors with it's Mythos-like models and is aware of what competitors are doing and is able to react in advance.

Seems to me that it's the reverse. Open ai dropped prices to compete with deepseek etc and then deepseek released this update to negate Luna.

The magic of post training with valuable dataset

Eagerly awaiting their V4 Pro update!

Can't really use it now, without giving away your data:

> Trains: this provider may use prompts for training and may retain prompt data.

That will cease to be a problem in the next 24 hours, now that the weights are out: https://huggingface.co/deepseek-ai/DeepSeek-V4-Flash-0731

This may come as a surprise to a lot of AI concerns, but I have -zero- interest in paying for a model.

Then DS V4 flash is pretty relevant, because it's pushing prices down.. as well as being self hostable with a large enough rig.

Why mention it? Just download the weights when they become available.

if they were anthropic they wouldve just released it as a new model

how this compare to luna high with reduced pricing.

This made my day !

i've made a comparison between this and GPT Luna (recent %80 price drop)

https://x.com/SourceCodeplz/status/2083099712760987746

i prefer GPT-5.6 Luna honestly

DeepSeek V4 Flash (Preview → 2026-07-31)

• Terminal Bench: 56.9 → 82.7 (+25.8)

• Toolathlon: 51.8 → 70.3 (+18.5)

Compared to GPT-5.6 Terra:

• Terminal Bench: Flash 82.7 vs Terra 78.4

• Toolathlon: Flash 70.3 vs Terra 53.1

• DeepSWE: Flash 54.4 vs Terra 69.6

• Agents' Last Exam: Flash 25.2 vs Terra 50.4

Trading blows with Terra, which is pretty interesting. No clear winner on these benchmarks, and wildy differeing scores. Very interesting!

> Terminal Bench: Flash 82.7 vs Terra 78.4

Terra 87.4

https://openai.com/index/gpt-5-6/

https://www.tbench.ai/leaderboard/terminal-bench/2.1

> 78.4

The real score is always the official benchmark.

We need to see later if DS4 flash 0731 is going to maintain the score but we need to look at the official benchmarks.

Already seen a PR for DeepSWE to update the benchmark with 0731, so we can verify claimed vs official.

The comment I replied to was comparing numbers released by each lab, and they made a typo with that specific benchmark.

Open flash model is competing against OpenAI's 'Sonnet' model at the price of GPT 3, I am really excited about this release, hopefully it holds up in real work as well

IIRC GPT 3 was priced at per 1k tokens, had to check, the biggest GPT 3 model from OpenAI was $0.06/1k, so $60 / 1M. gpt-3.5-turbo was the first model after ChatGPT and that was $2 / 1M. And no caching. So not really in the same ballpark

Since they did this with their own harness I m not sure it's apples to apples comparison.

> not sure it's apples to apples comparison.

They're literally comparing the previous version of the same model with the new one. It's based on the same architecture, same pre-trained model, just different post-training. It doesn't get more apples to apples than this.

I think the commenter means the Flash vs Terra benchmarks.

It will be fair if they release the harness though. I think now the future will be paired model-harness releases, not just weight dumps.

The performance changes are so big with the right harness that is makes sense to engineer the harness and fine-tune the model to one another from the start.

I think it's better than GPT Luna.

Let's see how the market reacts.

>benchmark results far exceeding V4-Pro-Preview:

Wow that's crazy

Good times for those that don't need strict data protection

These being open provide much better data protection.

Open weights means that there is a free market on providing inference using this model. Some of them will offer good data protection. (Well, hopefully)

Reply on news.ycombinator.com