Fable 5 is a nerfed version of Anthropic's Mythos model. Turns out it was actually too nerfed, and the company is sorry.

Claude Fable 5 brings Mythos-class AI coding power to general users, but with cybersecurity guardrails, fallback models, and pricing that could make developers think twice.

Anthropic is releasing Claude Fable 5, its first Mythos-class model available to the public. The model comes with guardrails that block responses in high-risk areas like…

‘Fable 5’ is the same system as controversial Mythos but comes with safeguards

Company also changes data retention policy