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

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📅 Last updated: December 27, 2025

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1 min read • 54 words

AI Builds Itself: The Codex Revelation

“The vast majority of Codex is built by Codex,” OpenAI told us about its new AI coding agent.

Key Implications

This statement highlights a significant shift in how advanced AI systems are developed and improved.

  • Self-improving AI systems can accelerate development cycles.

Source: Ars Technica. Image: BoliviaInteligente / Unsplash