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Combines improvements in reasoning, coding, and agent workflows, integrating the coding strengths of GPT-5.3-Codex. Upfront reasoning plans in ChatGPT allow users to adjust the model’s direction mid-response. Native computer-use capabilities, enabling agents to operate software, browsers, and workflows across applications. Up to 1M token context window and improved tool use with tool search for complex multi-step workflows. More accurate and efficient, with fewer hallucinations and significantly lower token usage than GPT-5.2. Improved performance on professional tasks like coding, spreadsheets, presentations, and deep web research.