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Opus 5.5 is the real deal: same accuracy as Fable 5.1 on my 25 graded tasks, faster, and way cheaper

TL;DR: Opus 5.5 matched the accuracy of every other top model on my graded tasks (only Haiku 4.5 fell short, mostly on the hardest tier) and, overall, was the fastest and cheapest of the models that hit 100%: about $0.09 estimated per passed task vs ~$0.26 for Fable 5.1, and 27s average vs 41s. It…

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  1. 2026-09-23 21:09 · r/ClaudeAI
    Opus 5.5 is the real deal: same accuracy as Fable 5.1 on my 25 graded tasks, faster, and way cheaper

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