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Claude Fable won’t answer basic biology questions

Published 10 June 2026 · tech

Anthropic just released Claude Fable 5, calling it the most powerful AI model it has ever made widely available and praising its skills in biology

Anthropic just released Claude Fable 5, calling it the most powerful AI model it has ever made widely available and praising its skills in biology, among others. But the model won't answer basic biology questions - the kind you'd expect a high schooler to handle.

Instead, it hands off the query to the former flagship model, Claude Opus 4.8. It isn't because Fable doesn't know the answers. It's because Anthropic won't let it, by design.

Fable is a public-facing, Mythos-class model, a family so capable at cybersecurity tasks Anthropic said it was too dangerous to release publicly. But while Anthropic

has spent much of the extended Mythos rol … Read the full story at The Verge.

Read full story on TheBriefWire

Claude Fable won’t answer basic biology questions

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Published: June 11, 2026 • 12:13 AM IST · Updated: June 11, 2026 • 12:37 AM ISTBy TheBriefWire Editorial Team

Claude Fable won’t answer basic biology questions

Key points

  • Anthropic just released Claude Fable 5, calling it the most powerful AI model it has ever made widely available and praising its skills in biology, among others.
  • But the model won't answer basic biology questions - the kind you'd expect a high schooler to handle.
  • Instead, it hands off the query to the former flagship model, Claude Opus 4.8. It isn't because Fable doesn't know the answers.
  • It's because Anthropic won't let it, by design.
  • Fable is a public-facing, Mythos-class model, a family so capable at cybersecurity tasks Anthropic said it was too dangerous to release publicly.

Published June 11, 2026.


📌 Source: The Verge

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