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On November 19, 2025, OpenAI introduced its latest Agentic coding model, the GPT-5.1-Codex-Max. This cutting-edge model is meticulously crafted to excel in long-duration computational tasks. Leveraging the innovative 'Compaction' technology, it possesses the remarkable ability to seamlessly operate across multiple context windows and adeptly manage million-scale Tokens within a single task framework. In terms of performance, the model showcases substantial enhancements. It optimizes Token utilization, resulting in a more streamlined and efficient processing speed. Currently, this advanced model is integrated into a variety of products, including the Codex CLI, IDE extensions, cloud-based platforms, and code review systems. Moreover, it is accessible to users who have subscribed to the premium tier of ChatGPT.
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