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AnthropicDropped Nov 9, 202667 builds50 makers18 prompts
Long-horizon agentic coding, research, and multi-day autonomous workflows with 1M context.

About this release
Claude Fable 5.2 is Anthropic’s generally available model for demanding reasoning and long-horizon agentic work. It improves on Fable 5.1 in coding, reasoning, and vision, with up to 30% faster output, lower pricing ($8/$40 per million tokens), and adaptive thinking always on. The same underlying model powers the more capable Mythos 5.2 variant available only through verification programs. It supports 1M token context, 128K max output, and is positioned for complex engineering, scientific research, and multi-agent projects.
Read the official Anthropic launch pageWorth opening first
Same brief, other models
All challenges →Challenge
Same brief across models — newer takes on the left, older on the right.
Challenge
Same brief across models — newer takes on the left, older on the right.
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