Claude Fable 5 and Claude Mythos 5

Anthropic launches Claude Fable 5, a Mythos-class model with state-of-the-art benchmarks, and Claude Mythos 5 for cyberdefenders. Fable 5 includes conservative safeguards that trigger in less than 5% of sessions. Mythos 5, with lifted safeguards, debuts via Project Glasswing with the US government.