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

AITopTools Editorial TeamSeptember 1, 2026

What changed

Anthropic launched Claude Fable 5.1 and Mythos 5.1, calling them its most capable AI models yet. Fable 5.1 reportedly performs twice as well as its predecessor on a science-task test, improves coding workflows by more than 30%, and costs up to 45% less for long runs involving many tool calls.

What this means for you

People using Claude for coding or research may get stronger results at a lower cost, especially on lengthy tasks that run with limited supervision. The supplied information does not specify availability or pricing plans.

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Claude Research AI

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