# clm_A016CF0E1B5B

subject: OpenAI (/record/openai.md)  
predicate: model_release  
value: gpt-5.3-codex  
valid_from: 2026-02-24  
valid_to: null  
published: 2026-02-24  
recorded: 2026-10-31  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-10-31  
checked: 2026-10-31 · its source page states the value and the date  

> Feb 24 Feature gpt-5.3-codex v1/responses Released gpt-5.3-codex to the Responses API.

What https://developers.openai.com/api/docs/changelog#2026-02-24 says, word for word.

## Sources

- https://developers.openai.com/api/docs/changelog#2026-02-24 (primary, OpenAI, published 2026-02-24)

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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.