Anthropic Launches Claude Fable 5.1 and Claude Mythos 5.1.They’re the world’s most advanced models for coding and knowledge work — and their research capabilities offer an early glimpse of how AI models will contribute to scientific progress.
Claude Fable 5.1 and Claude Mythos 5.1 are the same model, but with different levels of safeguards. Fable 5.1 is generally available, while Mythos 5.1 is available only through our trusted access programs; its safeguards are specifically designed to support work in cybersecurity and the life sciences.
Fable 5.1 can now be used to discover software vulnerabilities — though not to develop exploits for them. In biology, Anthropic has established an access program, developed in partnership with the US government, to enable access to Claude Mythos 5.1’s advanced biology capabilities.
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