AI Models

About this model

Claude Fable 5 is Anthropic's Mythos-class model built for autonomous knowledge work and coding. It targets long-running, complex, and asynchronous tasks that previously required frequent human check-ins, excelling at end-to-end work that would otherwise take a person hours, days, or weeks. It executes well-scoped tasks with few mistakes, automatically self-correcting through verification loops, and ships with robust safeguards.