GPT-5.3-Codex System Card
OpenAI Blog
February 5, 2026
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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Originally published on OpenAI Blog on 2/5/2026