Fable 5.1 costs twice as much as Opus 5, until your cache gets big enough
This story is from 2026-09-28. It is preserved in the archive; the latest stories are on the live feed.
Claude Fable 5.1 shipped on September 1 with the same $10 input / $50 output per million tokens as Fable 5. One number moved: cache reads dropped from $1 to $0.25 per million. On the price sheet it still costs twice what Opus 5 does ($5 / $25). But look at the cache-read column and the order flips.…
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- 2026-09-28 02:10 · DEV Community — AI
Fable 5.1 costs twice as much as Opus 5, until your cache gets big enough