Claude Fable 5.2 is a Mythos-class model from Anthropic and its most capable model for the most demanding technical work, released 2026-11-09. It improves on Claude Fable 5.1 in coding, reasoning, and vision, generates output up to 30% faster, and costs less per token than 5.1. It is built for long-running, ambiguous, or highly multi-step problems: large code refactors, autonomous agentic workflows, research, and analysis that previously required frequent human check-ins.
It supports text, image, and file inputs with always-on reasoning and a 1M-token context window. It executes well-scoped tasks with few mistakes, self-correcting through verification loops, and ships with Anthropic's safeguards, which block noticeably fewer legitimate requests than on Fable 5.1.
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