Fable 5.1

#124 in Frontier-Spraakmodelle

Fable Ai · v5.1 · 2× · tolest 24. Sept. 2026

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Momentum

Claude Fable 5.1 is Anthropic's most powerful generally available AI model of the "Mythos-class," released on September 1, 2026, and succeeds the previous Fable 5. It specializes in long-running, complex tasks in software development, knowledge work, and agentic workflows, and supports a context window of 1 million Token as well as multimodal text and image inputs. The model is offered proprietary via the Claude API as well as through AWS, Google Cloud, and Microsoft Foundry/Azure, with unchanged input/output pricing compared to Fable 5, but significantly reduced cache read pricing.

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