# O05: Prompt caching

- Publisher: OpenAI
- URL: [Primary source](https://developers.openai.com/api/docs/guides/prompt-caching)
- Published: not stated
- Updated/version date: not established
- Accessed: 2026-10-22
- Type: official API documentation
- Verification: opened source, rather than relying on a search excerpt

## Supported finding

Cache behavior and usage accounting depend on model generation and retention settings. Current documentation includes cache-write fields and charges.

## Limits and transfer

Check model-specific pricing, actual cache hits and writes. No universal discount applies to all repeated content.

## Use in the session

Mechanism and decision conditions. Retain the qualifications when translating the finding into slide copy. No source establishes Knauf's savings.