Claude Fable 5 is designed to tackle complex projects over days or weeks with minimal human oversight, while its unrestricted sibling remains limited to security and critical infrastructure partners

Anthropic said the new version, called Claude Fable 5, will have safeguards to prevent misuse in fields like cybersecurity.

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