OpenAI built an AI coding agent and uses it to improve the agent itself

Ars Technica
By Benj EdwardsDec 12, 2025, 5:16 pm91 ptsTrending
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’s almost entirely just being used to improve itself,”…

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