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The new version of the model from OpenAI brings a series of improvements that —as the company reports on its blog — will further facilitate developers’ work. GPT-5-Codex can independently write long sections of code, debug, add new features and tests, and thoroughly improve existing code.
Key updates
A key element is intelligent code review. The model can analyze repositories, run tests and point out potential errors before they appear in subsequent project iterations. Importantly, according to tests involving experienced software engineers, comments now generated by GPT-5-Codex are significantly more accurate than those by GPT-5. Inaccurate comments constituted only 4.4% of the total, while in the previous version, this percentage reached 13.7%.