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Comment by Ryan5453 | Hacker News Reader

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Ryan5453·

Pricing for Mythos Preview is $25/$125, so cheaper than GPT 4.5 ($75/$150) and GPT 5.4 Pro ($30/$180)

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For comparison, 5x the cost of Opus 4.6, and 1.67x for Opus 4.1

I think this would be very heavily used if they released it, completely unlike GPT 4.5

Opus 4 & 4.1 are still on Vertex+Bedrock @ $75/1mm out. They were used very heavily and in my subjective opinion are better than 4.5 and 4.6.

Interesting, what makes them better to you?

Opus 4, with enough context, could do most all I wanted in a single shot. More often than not, when I had a bad outcome and was frustrated I would realize that I was the problem (in giving improper direction or missing key context).

I also was in a pretty sweet position having a boat load of credits and premo vertex rate limits so I could 'afford' to dump hundreds of thousands of tokens in context all day.

With Opus 4.5 and 4.6, I find I have to steer very actively.

This is comparing using Opus 4 directly rather than comparing the performance of the models in Claude Code for example, or any 'agentic' setup.

Kinda reminds me of 4o vs 4-turbo.

I would imagine they are smaller models.

Where did you get that from?

From TFA:

> We do not plan to make Claude Mythos Preview generally available

From the article:

> Anthropic’s commitment of $100M in model usage credits to Project Glasswing and additional participants will cover substantial usage throughout this research preview. Afterward, Claude Mythos Preview will be available to participants at $25/$125 per million input/output tokens (participants can access the model on the Claude API, Amazon Bedrock, Google Cloud’s Vertex AI, and Microsoft Foundry).

Key point: available to participants.

permanent underclass has arrived :(

give it a couple months

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