Anthropic Opens Safer Claude Fable 5 to the Public, Keeps Mythos 5 Behind Guardrails

Anthropic released Fable 5, the public, safety-focused version of Claude Mythos, for broad use with safeguards, while Mythos 5 remains gated for select organizations via Project Glasswing due to cybersecurity concerns; sensitive queries go to the lower-tier Opus 4.8. About 200 organizations in 15+ countries have access, with extensive red-teaming and bug-bounty work, and collaboration with the U.S. government on testing. The model carries a price of $10 per million input tokens and $50 per million output tokens, and compute capacity includes SpaceX/xAI arrangements.