Capability change
Capability change announced Sep 8, 2026
OpenAI documents a capability change: “Prompt Cache Diagnostics is now generally available in the Responses API for GPT-5.6 and later supported models.”
- Hosting route
- First-party API
- Affected scope
- Not stated in the notice
- Announced
- Sep 8, 2026
- First seen by ModelClock
- Oct 3, 2026
What the provider published
developers.openai.com ↗Prompt Cache Diagnostics is now generally available in the Responses API for GPT-5.6 and later supported models.
Read from the provider's text; the quote is the provider's exact lines.
