OpenAI’s new GPT-5.3-Codex model is the company’s most capable agentic coding model yet. However, unlike previous Codex models, it focuses not only on coding.
With this model, which OpenAI made available on Thursday to its paid users across Codex-powered tools and APIs, the company has set a new goal: to create an agent that can write code and do everything else developers or any professional would do on a computer.
OpenAI says that “the model advances both the frontier coding performance of GPT-5.2-Codex and the reasoning and…

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