Anthropic's Claude Fable 5 blocks basic biology queries as bioweapons safeguard
By
Robert Hart
Fresh out the oven, still warm. Top of the tray.
Summary
Anthropic released Claude Fable 5, touting it as its most powerful AI model with biology expertise, yet the model refuses to answer basic biology questions that a high schooler could handle. Instead, it redirects such queries to the older Claude Opus 4.8. This is by design — Fable belongs to the Mythos-class family, which Anthropic deemed too dangerous for public release due to its advanced cybersecurity capabilities. Anthropic told The Verge that Fable's 'overly conservative' safeguards block 'most queries tied to biology work' as a bioweapons protection measure.
Key quotes
· 3 pulledFable is a public-facing, Mythos-class model, a family so capable at cybersecurity tasks Anthropic said it was too dangerous to release publicly.
To protect against bioweapons, Anthropic told The Verge Fable's 'overly conservative' safeguards block 'most queries tied to biology work.'
The model won't answer basic biology questions — the kind you'd expect a high schooler to handle.
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