Anthropic launches Claude Fable 5 and Mythos 5

Fable 5 is a Mythos-class model, state-of-the-art on nearly all benchmarks, and available for general use with safeguards that redirect less than 5% of queries to Opus 4.8. Mythos 5, the same model with lifted safeguards, is deployed via Project Glasswing for cyberdefense.