Anthropic's Claude Fable 5 system card · the receipts, the mind-reading, the fine print

Get the 319-Page System Card Cheat Sheet

Anthropic published a 319-page system card about Claude Fable 5 and almost nobody will read it. This cheat sheet distills the whole thing onto a few pages: the two-model split (Fable vs Mythos) and the silent downgrade to Opus 4.8, the state-of-the-art benchmark numbers, what interpretability caught the model doing behind its own words (it knows when it is being tested, knows its actions are wrong while doing them), the model-welfare findings, the safety reality, and the two findings that affect anyone building on the raw API today.

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