Prompt Caching in Practice: From 7% to 74% Hit Rate(Inference in Production Series)

Prompt caching is the highest-leverage cost and latency optimization most teams haven’t fully exploited. The mechanics, the economics, and the step-by-step path from single-digit hit rates to 60–80% — with a first-hand DigitalOcean serverless benchmark and the one layout mistake that ruins caching.