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Claude Fable 5: Anthropic's Mythos-class model for agentic work

Claude Fable 5 is Anthropic's most capable publicly available model, sitting at the top of the Claude 5 generation in the Mythos-class tier. It is optimized for multi-step agentic tasks with extended context, reliable tool use, and reduced error propagation. Fable 5 is publicly available, while Mythos 5 has more restricted access.

Claude Fable 5: Anthropic's Mythos-class model for agentic work — AIBriefs