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Comment by ikidd | Hacker News Reader

And they've hobble Fable and Opus so hard with their safety guardrails, I ask innocuous questions and tasks and they get flagged so often I gave up on it. I can get all the work I need done in GPT5.5 or 5.6 without the hassle.

I just kept a $20 plan going for use on my phone.

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They also made Fable no longer ZDR for businesses which killed tons of demand for it.

what could be the rationale for that...?

They want to be able to zoom in and zoom out as needed while analyzing aggregated user requests to better understand the different kinds of ways (well-resourced) actors use to distill their most capable models.

> "The data will help us defend against complex and novel attacks (including new jailbreaks and attacks that operate across many requests) as well as help us identify and reduce false positives."

From: https://www.anthropic.com/news/claude-fable-5-mythos-5

> "Some attacks only become visible across multiple requests. Best-of-N jailbreaking, for example, sends hundreds of slight variations of a prompt in the hope that one will work. Larger patterns of misuse, such as state-sponsored espionage or data extortion campaigns, only surface when our safeguards classifiers can zoom out across many requests. Detecting these threats requires temporarily retaining prompts and outputs so they can be analyzed together, rather than one at a time."

From: https://support.claude.com/en/articles/15425996-data-retenti...

I had Fable bail on me because I used the word autopilot on a project. Changed to something unrelated, and off we went.

I haven’t hit the Fable guardrails a single time after substantial usage. And I’m working on a ML project (a game AI).

I don’t doubt people are hitting it… shrugs

Yeah same. Multiple 20x max accounts, I typically hit > 50% of the fable usage limit on eace, literally never seen a guardrail. Maybe I’m boring? Maybe they have some kind of account reputation system?

I hit it once when I asked a question about whether butterflies remember anything from their time as caterpillars. I've never hit it for coding, but I also don't really do much related to security.

Doesn't it silently downgrade to Opus for ML work?

You are saying it could say "Fable" in the model description (e.g. bottom left of TUI for Claude Code) when it is secretly Opus?

That would be absolutely insane... I don't think it's doing that?

It appears they rolled it back, but yes that is how it initially worked.

https://readysolutions.ai/blog/2026-06-10-claude-fable-5-sil...

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