Your prompt-cache fix is worth 0% if your users only send one message
This story is from 2026-10-05. It is preserved in the archive; the latest stories are on the live feed.
A 30-turn measurement of how the saving amortises — and why the "one-line fix" quietly decays as conversations get longer. Last week I published a benchmark showing that moving a roughly 30-token volatile header out of the top of a system prompt cut steady-state inference cost by 96%. The setup, th…
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- 2026-10-05 11:58 · DEV Community — AI
Your prompt-cache fix is worth 0% if your users only send one message