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How OpenAI is using GPT-5 Codex to improve the AI tool itself

Summary by Ars Technica
With the popularity of AI coding tools rising among some software developers, their adoption has begun to touch every aspect of the process, including the improvement of AI coding tools themselves. In interviews with Ars Technica this week, OpenAI employees revealed the extent to which the company now relies on its own AI coding agent, Codex, to build and improve the development tool. “I think the vast majority of Codex is built by Codex, so it’…

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Ars Technica broke the news in United States on Friday, December 12, 2025.
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