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Anthropic's Claude Fable 5.1 promises better coding and research at up to 45 percent less

This story is from 2026-09-01. It is preserved in the archive; the latest stories are on the live feed.

Anthropic launches Claude Fable 5.1 and Mythos 5.1, its most capable AI models yet. Fable 5.1 doubles its predecessor's score on Terminal-Bench-Science and improves agentic coding by over 30 percent. Costs drop by up to 45 percent for long, autonomous runs with many tool calls. The article Anthropi…

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  1. 2026-09-01 20:01 · The Decoder
    Anthropic's Claude Fable 5.1 promises better coding and research at up to 45 percent less

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