Claude Fable 5.2 (Global)

Claude Platform documentation lists Claude Fable 5.2 with a 1M-token context window, 128K max output, adaptive thinking always on with high default effort, and a June 2026 knowledge cutoff. On Amazon Bedrock its model ID is anthropic.claude-fable-5-2, priced at $8 per million input tokens and $40 per million output tokens. The model status is active as of its November 9, 2026 release, with retirement not sooner than November 9, 2027, and it is distributed across the Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry, and Claude Platform on AWS. Guidance notes that temperature, top p, and top k should be omitted, and forced tool use returns an error.

Anthropic released Claude Fable 5.2 and Claude Mythos 5.2 on November 9, 2026, upgrading the same underlying model with better coding, reasoning, and vision performance. Anthropic says output is generated up to 30% faster than Fable 5.1 and Mythos 5.1, with pricing lowered to $8 per million input tokens and $40 per million output tokens. An optional fast mode accelerates token generation by up to 2.5 times at $16 per million input tokens and $80 per million output tokens. Fable 5.2 keeps strong cybersecurity and biology safeguards but produces fewer unnecessary blocks, while Mythos 5.2 is restricted to organizations verified through Anthropic's Cyber and Life Sciences programs.

Anthropic released Claude Fable 5.2 and Claude Mythos 5.2 on November 9, 2026, describing them as its most capable models for the hardest technical challenges. The two versions share one underlying model, with Fable adding cybersecurity and biology safeguards so it can be offered broadly, while Mythos 5.2 access is limited to vetted cybersecurity and life-science organizations. The report says pricing falls to $8 per million input tokens and $40 per million output tokens from $10 and $50, with an optional fast mode at double the rate, and output up to 30% faster than the prior generation. Anthropic reports 49.1% on FrontierCode 2.0 at its highest effort setting, though the article notes most figures are vendor-reported or from early testers rather than independently verified.

Anthropic's system card for Claude Fable 5.2 and Claude Mythos 5.2, dated November 9, 2026, describes both as two configurations of a single new large language model. Claude Fable 5.2 is released for general use with additional safeguards in high-risk dual-use domains such as biology and cybersecurity, while Claude Mythos 5.2 uses more permissive safeguards and is restricted to vetted organizations through trusted access programs. The card reports pre-deployment evaluations across seven areas, including improved capability for novel mathematical and scientific reasoning and advances in coding, knowledge work, and problem-solving. It finds the RSP autonomy threat model 1 applicable to Mythos 5.2 but assesses residual risk as low per the August 2026 Risk Report, states the model does not appear to substitute for research staff on automated R&D, and applies CB-1 protections after finding the model does not cross the CB-2 threshold.

Anthropic announced Claude Fable 5.2 on November 9, 2026, describing it as the next generation of intelligence for the hardest knowledge-work and coding problems, with a new bar in coding, finance, and the sciences. It supersedes Claude Fable 5.1, which had been introduced on September 1, 2026, and the API identifier is claude-fable-5-2. Claude Fable 5.2 is priced at $8 per million input tokens and $40 per million output tokens, down from $10 and $50 for Fable 5.1, with cache reads at $0.20 per million tokens. It is available on the Claude Platform natively and through Amazon Web Services, Google Cloud, and Microsoft Foundry, with an optional fast mode delivering up to 2.5x faster speed at $16 per million input and $80 per million output tokens.