It was in the announcement, too. I’m 99% sure they edited it after they changed their mind, because I knew about it from reading that, and never opened the model card.

On the earliest web archive snapshot I can find [0], I do not see any mention of the safeguard/sabotage under discussion [1].

And to be clear, this isn't the safeguard where the model is explicitly downgraded to Opus, but rather where the Fable/Mythos model's "effectiveness" is transparently "limited" via "prompt modification, steering vectors, or parameter-efficient fine-tuning (PEFT)".

[0]: https://web.archive.org/web/20260609173222/https://www.anthr...

[1]: https://simonwillison.net/2026/Jun/10/if-claude-fable-stops-...