Build Hour: Prompt Caching
OpenAI. OpenAI's own Build Hour on prompt caching — the 1024-token threshold, the prefix-stability requirement, audio caching at 99% discount for realtime, time-to-first-token impacts at long inputs. Useful when you are sizing the engineering effort to actually hit the cache reliably on your production prompts.
What you should get from this
Use prompt caching only when stable prefixes, latency and cost behavior match the workload.
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