OpenAI's GPT-5.3-Codex: The AI Model That Helped Build Itself
Synthesis4 Sources
•February 5, 2026

OpenAI's GPT-5.3-Codex: The AI Model That Helped Build Itself

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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.