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GPT-5.3-Codex System Card

OpenAI releases GPT-5.3-Codex, an agentic coding model combining the coding performance of GPT-5.2-Codex with the reasoning capabilities of GPT-5.2.

Feb 5 · 01:00:00 · primary fetch1 sourceupdated Feb 5 · 01:00:00

GPT‑5.3-Codex is the most capable agentic coding model to date, combining the frontier coding performance of GPT‑5.2-Codex with the reasoning and professional knowledge capabilities of GPT‑5.2.

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openai.comGPT-5.3-Codex System Cardprimary01:00:00