Tibo@thsottiaux
Day 16/ Summary Prompt caching in the API can last 12 hours. Tibo also says cached context is kept indefinitely for signed-in Codex and Work users, so returning to an older conversation or resuming after several hours can still hit the cache without an extra context-processing penalty.
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第 16 天 / 内容摘要 API 支持保留 12 小时的提示缓存。对于登录使用 Codex 与 Work 的用户，Tibo 表示缓存会持续保留，回到旧对话或间隔数小时恢复任务时，仍能命中缓存，不再因此承担重新处理上下文的额外开销。