The cached-prefix crossover: when the cheaper LLM becomes the expensive one
This story is from 2026-10-10. It is preserved in the archive; the latest stories are on the live feed.
Most LLM cost comparisons collapse a model to one number: $X per million input tokens . That number is the price of a cache miss . Once prompt caching is on, most of the tokens you send on every request are billed at the cached-read rate instead — and caching does not discount every model equally.…
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- 2026-10-10 20:24 · DEV Community — AI
The cached-prefix crossover: when the cheaper LLM becomes the expensive one