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Fable 5.1 vs Fable 5 vs Opus 5: It's All in the Cache

This story is from 2026-09-06. It is preserved in the archive; the latest stories are on the live feed.

Fable 5.1 vs Fable 5 vs Opus 5: It's All in the Cache Claude Fable 5.1 shipped on 1 September 2026 as the cheaper Fable. Base rates did not move: input is still $10 per million tokens and output $50, the same as Fable 5. The entire cut is one line, cache reads, $1 to $0.25. That 75% cut is what Ant…

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  1. 2026-09-06 11:33 · DEV Community — AI
    Fable 5.1 vs Fable 5 vs Opus 5: It's All in the Cache

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