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Anthropic Ships Claude Fable 5.1 Broadly, Restricts Claude Mythos 5.1 to Trusted Access

This story is from 2026-09-14. It is preserved in the archive; the latest stories are on the live feed.

Anthropic released Claude Fable 5.1 and Claude Mythos 5.1 as two access tiers of what the company describes as the same underlying model, differentiated only by safeguard level. Fable 5.1 is generally available across Anthropic's own platform, AWS, Google Cloud, and Microsoft Azure, while Mythos 5.…

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  1. 2026-09-14 09:31 · DEV Community — AI
    Anthropic Ships Claude Fable 5.1 Broadly, Restricts Claude Mythos 5.1 to Trusted Access

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