Positioned a tier above the previous Opus models, Claude Fable 5 sets a new benchmark for generally available AI, outperforming rivals like OpenAI's GPT-5.5.

Anthropic has released a full version of its cybersecurity-centric Claude Mythos model—along with a safer version for the general public.

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…