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Claude Fable 5.1 Agent Test: Sonnet Tied It at 1/8 the Cost

This story is from 2026-10-30. It is preserved in the archive; the latest stories are on the live feed.

Originally published on RanThis . Cover: AI-generated illustration. Claude Fable 5.1 is not worth its price for a month-end close with tools. We gave Fable, Opus 5.5 and Sonnet 5.5 three exports and ten traps; all three closed the books correctly, and Fable cost the most and took the longest. Anthr…

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  1. 2026-10-30 04:25 · DEV Community — AI
    Claude Fable 5.1 Agent Test: Sonnet Tied It at 1/8 the Cost

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