Anthropic has introduced Claude Fable 5 for general users and Mythos 5 for approved partners. Here's what the new AI models do and how they differ.

Anthropic has disputed allegations of a prompt-based jailbreak affecting its recently launched Claude Fable 5 AI model.

Anthropic Fable 5 delivers its biggest gains on the kinds of coding and analytical work that require sustained effort over time.

It isn’t because Fable doesn’t know the answers. It’s because Anthropic won’t let it, by design. Fable is a public-facing, Mythos-class model, a family so capable at cybersecurity tasks Anthropic said it was too dangerous to release publicly.