# clm_E1B5C1279BA1

subject: OpenAI (/record/openai.md)  
predicate: feature_added  
value: extended prompt caching  
valid_from: 2025-11-13  
valid_to: null  
published: 2025-11-13  
recorded: 2026-11-03  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-04  
cite: AsOf. "OpenAI feature added: extended prompt caching", as of 2025-11-13. Claim clm_E1B5C1279BA1, https://asof.is/claim/clm_E1B5C1279BA1, accessed 2026-11-08. Source: https://openai.com/index/gpt-5-1-for-developers.  
checked: 2026-11-04 · its source page states the value and the date (its publisher's feed entry for the page)  

> GPT-5.1 is now available in the API, bringing faster adaptive reasoning, extended prompt caching, improved coding performance, and new apply_patch and shell tools

What https://openai.com/index/gpt-5-1-for-developers says, word for word.

## Sources

- https://openai.com/index/gpt-5-1-for-developers (primary, OpenAI, published 2025-11-13)

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