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Claude Fable 5.1 Is Here: 75% Cheaper Caching, Insane Agent Benchmarks

This story is from 2026-09-09. It is preserved in the archive; the latest stories are on the live feed.

Anthropic just dropped their latest flagship: Claude Fable 5.1 , alongside the specialized Claude Mythos 5.1 . Both models are rolling out across the Claude Web UI, Claude Code, the API, AWS Bedrock, Google Cloud, and Azure. If you’ve been tracking enterprise AI usage, you might know that Fable 5 a…

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  1. 2026-09-09 15:33 · DEV Community — AI
    Claude Fable 5.1 Is Here: 75% Cheaper Caching, Insane Agent Benchmarks

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