Claude Fable 5.1 and Mythos 5.1
One model with two safeguard levels: Fable 5.1 generally available, Mythos 5.1 only via trusted access programs.
Our most advanced models for coding and knowledge work. Their research capabilities also offer an early glimpse of how AI models will contribute to scientific progress.
Official source
Introducing Claude Fable 5.1 and Claude Mythos 5.1anthropic.com · published