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

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

The Decoder · Sep 1, 2026, 8:32 PM UTC

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 Anthropic's Claude Fable 5.…