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On October 21, 2026, Tibo announced that the OpenAI API can now opt for 12-hour prompt caching, so shared instructions, tools, and context can be cached for longer, and even when requests are hours apart, they are billed at the lower cached input price. Tibo also added that for logged-in Codex and Work users, caches are retained indefinitely, so returning to an old conversation or continuing hours later incurs no extra cost and cache hits are guaranteed. This information currently comes from the single source Tibo, and there are no subsequent developments or facts yet.
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OpenAI API supports 12-hour prompt caching; caches are retained long-term for logged-in Codex and Work usersDevelopments
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Oct 21
Tibo
OpenAI API supports 12-hour prompt caching; caches are retained long-term for logged-in Codex and Work users
The OpenAI developer account announced that the API can now opt into 12-hour prompt caching, so shared instructions, tools, and context can stay cached longer, and even when requests are hours apart they are billed at the lower cached-input rate. Tibo added that for logged-in Codex and Work users, caches are retained indefinitely, so returning to an old conversation or continuing hours later incurs no extra cost and cache hits are guaranteed.