# clm_32F477987025

subject: Codex (/record/openai-codex.md)  
predicate: model_release  
value: codex-1  
valid_from: 2025-05-16  
valid_to: null  
published: 2025-05-16  
recorded: 2026-11-03  
confidence: 0.50  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-04  
cite: AsOf. "Codex model release: codex-1", as of 2025-05-16. Claim clm_32F477987025, https://asof.is/claim/clm_32F477987025, accessed 2026-11-08. Source: https://openai.com/index/o3-o4-mini-codex-system-card-addendum.  
checked: 2026-11-04 · its source page states the value and the date (its publisher's feed entry for the page)  

> Codex is powered by codex-1, a version of OpenAI o3 optimized for software engineering.

What https://openai.com/index/o3-o4-mini-codex-system-card-addendum says, word for word.

## Sources

- https://openai.com/index/o3-o4-mini-codex-system-card-addendum (primary, OpenAI, published 2025-05-16)

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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.