OpenAI’s AI coding agent Codex now independently creates most of the code it uses to improve itself. Since its introduction in May 2025, Codex has been performing tasks such as writing functions, fixing bugs and managing change proposals. It can be used via cloud, CLI and IDE extensions. OpenAI treats it as a ‘teammate’ and integrates it into project management and communication tools to assign tasks and review results collaboratively.
Codex speeds up development, as demonstrated by the rapid release of the Sora Android app, while human oversight ensures code quality. The approach increases developer productivity and could enable non-programmers to code in the future.
