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Anthropic releases Mythos 5.2 and Fable 5.2, saying they are "best for the most ambitious, open-ended technical work", with outputs up to 30% faster than 5.1 (Anthropic)

Source: TECHMEME · NOV 09, 2026

Anthropic : Anthropic releases Mythos 5.2 and Fable 5.2, saying they are "best for the most ambitious, open-ended technical work", with outputs up to 30% faster than 5.1 — We've upgraded Claude Fable and Claude Mythos—models that are designed to tackle the most daunting technical challenges.

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Related on Frontier

  • Anthropic launches new Claude Fable and Mythos 5.2 models Nov 9, 2026
  • Anthropic prices Fable 5.2 and Mythos 5.2 at $8/1M input and $40/1M output tokens, down 20% from 5.1; fast mode costs $16/1M input and $80/1M output tokens (Frederic Lardinois/The New Stack) Nov 9, 2026
  • Anthropic says during prerelease testing Mythos 5.2 and Fable 5.2 formalized the proof of Fermat's Last Theorem and solved two open black hole physics problems (Jay Peters/The Verge) Nov 9, 2026
  • Anthropic releases new Mythos and Fable models amid RSI concerns Nov 9, 2026
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