Prompt Cache Diagnostics is now generally available in the Responses API for GPT-5.6 and later supported mode…
OpenAI · developers.openai.com/api/docs/changelog#2026-09-08-1
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Prompt Cache Diagnostics is now generally available in the Responses API for GPT-5.6 and later supported models. Compare cache reuse against a previous response, identify reasons for cache misses, and follow troubleshooting guidance to imp…