AI news
OpenAI adds a 12-hour prompt-cache option with a higher write price
OpenAI’s Responses API changelog adds a 12-hour prompt-cache retention option. Its pricing guide lists the 12-hour cache write at 2.5 times the ordinary input-token rate, versus 1.25 times for the default 30-minute write; cache reads remain discounted by model. The 12 hours are a minimum retention setting, not a promise of deletion at that mark.
Primary source · OpenAI · October 20, 2026
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