# GPT-5.3-Codex release date

entity: /record/gpt-5-3-codex.md  
predicate: model_release  
page: /record/gpt-5-3-codex/model_release  
as_of: 2026-11-04  

As of November 4, 2026, the AsOf record says GPT-5.3-Codex was released on February 24, 2026 (as gpt-5.3-codex), from a primary source (developers.openai.com). The record holds 1 claim on GPT-5.3-Codex's release, 1 still open and 0 superseded, each dated and sourced; a replaced value is closed with an end date, never deleted.

## Current release date

What the record asserts on 2026-11-04.

- [GPT-5.3-Codex](/record/gpt-5-3-codex.md) | model_release | gpt-5.3-codex | valid 2026-02-24 to present | conf 0.95 | valid | [clm_55F8E9407504](/claim/clm_55F8E9407504.md)
  sources: https://developers.openai.com/api/docs/changelog#2026-02-24

## Every dated value

One claim per line, oldest first. Superseded claims stay visible.

- [GPT-5.3-Codex](/record/gpt-5-3-codex.md) | model_release | gpt-5.3-codex | valid 2026-02-24 to present | conf 0.95 | valid | [clm_55F8E9407504](/claim/clm_55F8E9407504.md)
  sources: https://developers.openai.com/api/docs/changelog#2026-02-24

## Questions this record answers

### When was GPT-5.3-Codex released?

On February 24, 2026 (as gpt-5.3-codex), from a primary source (developers.openai.com) (status valid, confidence 0.95).


## Get this data

- JSON: /v1/entities/gpt-5-3-codex/model_release (this fact) · /v1/entities/gpt-5-3-codex?predicates=model_release (with the entity's coverage; add as_of=YYYY-MM-DD for a date)
- MCP: timeline(entity: "gpt-5-3-codex", predicates: ["model_release"]) for every dated value · fetch(id: "/record/gpt-5-3-codex/model_release.md") for this page
- Entity twin: /record/gpt-5-3-codex.md · timeline: /timelines/gpt-5-3-codex.md

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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.