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Claude Fable 5.1 and Claude Mythos 5.1 launched

GAVerifiedAdded Sep 22, 2026

Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1, described as its most advanced models for coding and knowledge work.

Topics: LLMs

Anthropic's release notes

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Also shipped on Sep 1, 2026

Anthropic in September 2026

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