# clm_D077BF7955E8

subject: OpenAI o1 (/record/openai-o1.md)  
predicate: released  
value: o1-pro  
valid_from: 2025-03-19  
valid_to: null  
published: 2025-03-19  
recorded: 2026-11-03  
confidence: 0.50  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-03  
checked: 2026-11-03 · its source page states the value and the date  

> Mar 19 Feature o1-pro v1/responses v1/batch Released o1-pro , a version of the o1 reasoning model that uses more compute to answer hard problems with better reasoning and consistency.

What https://developers.openai.com/api/docs/changelog#2025-03-19 says, word for word.

## Sources

- https://developers.openai.com/api/docs/changelog#2025-03-19 (primary, OpenAI, published 2025-03-19)

---

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