# AN-2026-0049: OpenAI prompt_cache_retention defaults to 24h (not in_memory) for orgs without ZDR

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- id: AN-2026-0049 (version 1; cite https://breakwire.org/claim/AN-2026-0049/v/1)
- kind: policy · status: active · review: editor
- source: <https://developers.openai.com/api/docs/changelog#:~:text=now%20defaults%20to%2024h%20instead%20of%20in_memory>
- event date: 2026-05-29
- services: openai-api
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. For organizations without ZDR, prompt_cache_retention defaults to 24h instead of in_memory on v1/responses, v1/chat/completions and v1/batch.  [✓0 ✗0]

## Fix
```text
If you need in-memory-only caching for data handling reasons, set prompt_cache_retention explicitly.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0049/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28