OpenAI launches GPT‑5.3-Codex as AI race heats up after Anthropic’s Claude Opus 4.6 — all you need to know
Sam Altman-led OpenAI on 5 February unveiled a new Codex model, GPT‑5.3-Codex, which the company claims is the “most capable agentic coding model to date.”
It is the first model to “meaningfully contribute to its own creation.” According to the company statement, early versions have been used to debug training, manage deployment, and analyse test results and evaluations.
