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Sourced model record · Catalog current through July 21, 2026

Codex

A reviewed catalog record from OpenAI, released July 7, 2021. This page reports only what named sources publish about this exact record, with receipts.

API accessClosed weightsLanguage

What the evidence says

Developer
OpenAI
Released
July 7, 2021
Domains
Language
Tasks
Code autocompletion
Access
API access
Weights
Closed weights

Common questions

What is Codex?

Codex is a OpenAI model released July 7, 2021, according to Epoch AI's reviewed catalog record. The record classifies it under language.

How does Codex rank on LMArena?

No board Model Gauntlet mirrors currently lists this exact model revision under a reviewed identity, so no rating is reported here.

What does Codex cost?

No reviewed source carries pricing for this record, so no price is reported here.