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Claude Fable 5.1 vs Opus 5: Which One Earns Its Price

This story is from 2026-09-02. It is preserved in the archive; the latest stories are on the live feed.

Fable 5.1 costs twice what Opus 5 does on input and output, and the benchmark gaps do not justify that for most work On single hard questions the two are within 1.4 points, so Opus 5 is the value pick On long unattended agent runs the gap is 23.6 points and the argument flips completely Cache reads…

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  1. 2026-09-02 00:45 · DEV Community — AI
    Claude Fable 5.1 vs Opus 5: Which One Earns Its Price

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