# clm_9B96C875503B

subject: OpenAI (/record/openai.md)  
predicate: feature_added  
value: Prompt Cache Diagnostics  
valid_from: 2026-09-08  
valid_to: null  
published: 2026-09-08  
recorded: 2026-10-31  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-10-31  
checked: 2026-10-31 · its source page states the value and the date  

> Sep 8 Feature v1/responses Prompt Cache Diagnostics is now generally available in the Responses API for GPT-5.6 and later supported models.

What https://developers.openai.com/api/docs/changelog#2026-09-08 says, word for word.

## Sources

- https://developers.openai.com/api/docs/changelog#2026-09-08 (primary, OpenAI, published 2026-09-08)

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