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On January 15, 2026, OpenAI granted developers access to the GPT-5.2-Codex model via the Responses API. This model, which is constructed on the GPT-5.2 framework, combines terminal operations with 'context compression' technology. It is purposefully crafted to tackle intricate software engineering challenges, facilitating long-duration tasks like code refactoring, feature development, and vulnerability identification. Its top-tier performance in assessments such as SWE-Bench Pro has led to its incorporation into widely used development tools like Cursor and GitHub. According to Cursor's testing, the model autonomously produced over 3 million lines of code in a single week, culminating in the successful creation of a fully functional Rust-based browser.
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