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Preview · early version, more releases are being added · early version
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Anthropic · model release

Claude Fable 5 and Claude Mythos 5

Anthropic releases Fable 5, its strongest Claude for general use, plus a restricted twin for security work.

In detail

Anthropic released Claude Fable 5 to the public through its API and subscription plans. Claude Mythos 5, the same model with some safeguards lifted, went only to a small group of cyberdefenders and infrastructure providers.

Sources

  1. Claude Fable 5 and Claude Mythos 5 · Anthropic · Primary source
  2. Claude Fable 5 (model overview) · Anthropic · Primary source

Last checked 11 November 2026.

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