# clm_AD363F5E203F

subject: OpenAI (/record/openai.md)  
predicate: policy_changed  
value: prompt_cache_retention  
valid_from: 2026-05-29  
valid_to: null  
published: 2026-05-29  
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  

> May 29 Update v1/responses v1/chat/completions v1/batch For organizations without ZDR enabled, prompt_cache_retention now defaults to 24h instead of in_memory , enabling extended prompt caching by default.

What https://developers.openai.com/api/docs/changelog#2026-05-29 says, word for word.

## Sources

- https://developers.openai.com/api/docs/changelog#2026-05-29 (primary, OpenAI, published 2026-05-29)

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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.