# clm_5B364764E97C

subject: OpenAI o3 (/record/openai-o3.md)  
predicate: model_release  
value: o3  
valid_from: 2025-04-16  
valid_to: null  
published: 2025-04-16  
recorded: 2026-11-04  
confidence: 0.95  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-04  
checked: 2026-11-04 · its source page states the value and the date  

> Apr 16 Feature v1/chat/completions v1/responses Added two new o-series reasoning models, o3 and o4-mini .

What https://developers.openai.com/api/docs/changelog#2025-04-16 says, word for word.

## Sources

- https://developers.openai.com/api/docs/changelog#2025-04-16 (primary, OpenAI, published 2025-04-16)

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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.