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Fable 5.1 cut cache reads by 75%. Cost per task went up 20% anyway.

This story is from 2026-09-04. It is preserved in the archive; the latest stories are on the live feed.

In the same week that Claude Fable 5.1 shipped, two things happened that look like they cannot both be true. Millennium had a piece of code that crashed about one run in a million. Their team had not explained it in four to five years. Every model they tried missed it, Fable 5 included. Fable 5.1 f…

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  1. 2026-09-04 15:34 · DEV Community — AI
    Fable 5.1 cut cache reads by 75%. Cost per task went up 20% anyway.

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