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

OpenAI has developed an AI coding agent called Codex, which is used to enhance and refine itself. Codex, launched in May 2025, is a cloud-based software engineering tool that can perform tasks such as writing code, fixing bugs, and suggesting pull requests. The tool operates in sandboxed environments connected to a user's code repository and can handle multiple tasks simultaneously. OpenAI provides Codex through various interfaces, including ChatGPT, a command-line interface, and IDE extensions. The name "Codex" is linked to a previous OpenAI model that powered GitHub Copilot, showcasing the potential of AI in understanding and accelerating coding tasks.