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fable

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SEP 02, 2026

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Tagged fable clear ×

Claude Fable 5.1 cuts the cache price 75%. At max effort, a task still costs more.

Anthropic shipped Claude Fable 5.1 to everyone and the same weights as Mythos 5.1 to vetted US organizations, cutting cache reads 75% to $0.25, but the first independent run found a max-effort task costs 20% more than on Fable 5.