• 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 has announced GPT‑5.3‑Codex, its latest coding model, described as the most capable agentic coding system to date. The release builds on GPT‑5.2‑Codex’s advanced code generation performance while integrating the reasoning and professional knowledge strengths of GPT‑5.2. According to the system card, GPT‑5.3‑Codex can autonomously write, debug, and optimize code across multiple programming languages, leveraging deeper contextual understanding and domain‑specific expertise. The update signals OpenAI’s continued focus on combining high‑accuracy code synthesis with robust reasoning capabilities, positioning GPT‑5.3‑Codex as a leading tool for developers and technical professionals.

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