Claude Fable 5.1 and Claude Mythos 5.1
Anthropic has released Claude Fable 5.1 and Claude Mythos 5.1, advanced AI models designed for coding and knowledge work. The update includes improved pricing, enhanced data privacy through Enterprise Frontier Safeguards, and refined safety protocols for sensitive fields like cybersecurity.
Why it matters
These updates reflect the industry's push toward more specialized, secure, and cost-effective AI models for enterprise and scientific research applications.
We’re introducing 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.
Alongside its increased capabilities, Fable 5.1 takes important steps towards addressing the feedback we’ve received from customers on price, data retention, and safeguards.
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