OpenAI Prompt Caching: When Is the New 12-Hour Cache Cheaper?
This story is from 2026-10-27. It is preserved in the archive; the latest stories are on the live feed.
Your prompt caching dashboard shows a healthy read hit rate. The inference bill stays high anyway. Then OpenAI ships 12-hour prompt caching , and someone on the team asks whether you should switch. On GPT-5.6 and later, a 12-hour ( 12h ) cache write costs 2.5x the input price, while a write at the…
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- 2026-10-27 21:55 · DEV Community — AI
OpenAI Prompt Caching: When Is the New 12-Hour Cache Cheaper?