Your system prompt is silently killing your prompt cache
This story is from 2026-10-04. It is preserved in the archive; the latest stories are on the live feed.
A benchmark on DeepSeek. Moving roughly 30 tokens from the top of a system message to the bottom cut steady-state inference cost by 96%. If you run a chat or roleplay app, your system message is probably the largest thing you send to the model. A character card, a lorebook, a memory summary — tens…
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- 2026-10-04 08:33 · DEV Community — AI
Your system prompt is silently killing your prompt cache