Claude Platform – November 9, 2026

What’s in this update

• We’ve launched Claude Fable 5.2 (`claude-fable-5-2`), built for demanding reasoning and long-horizon agentic work. Claude Mythos 5.2 (`claude-mythos-5-2`) offers the same capabilities only to organizations verified through Anthropic’s verification programs, such as the Cyber Verification Program. Both models have a 1M token context window, 128k max output tokens, and always-on adaptive thinking. They cost $8 USD per MTok of input and $40 USD per MTok of output (Claude Fable 5.1 and Claude Mythos 5.1 cost $10 USD per MTok of input and $50 USD per MTok of output). Claude Fable 5.2 is available on the Claude API, Amazon Bedrock (`bedrock-runtime`), Claude Platform on AWS, Claude Models on Google Cloud (Anthropic managed), Claude Models on Google Cloud (Google managed), and Claude in Microsoft Foundry. See [What’s new in Claude

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