Anthropic flagship model for demanding technical work, released 9 November 2026. $8 input and $40 output per million tokens. Shares an underlying model with Claude Mythos 5.2, which is restricted to vetted organisations.
Claude Fable 5.2 is Anthropic flagship model for demanding technical work, released on 9 November 2026. API pricing is $8 per million input tokens and $40 per million output tokens, with an optional faster tier at $16 and $80.
Fable shares its underlying model with Claude Mythos 5.2. The difference is access and safeguards rather than capability: Fable is available to everyone with stronger cybersecurity and biology safeguards, while Mythos goes only to vetted organisations through a verification programme.
Published results include 69.9% on FrontierSWE v2, 49.1% on FrontierCode 2.0 at Xhigh effort, 74.2% on Humanity's Last Exam with tools, 89.3% on OSWorld 2.1 for computer use and 73.4% on Chartography for chart reading. Anthropic does not publish a context window figure on the announcement page.
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