Codex is OpenAI's coding agent for working on software projects. It helps read code, make changes, and verify work, giving builders assistance with implementation and investigation across a repository.
Move a feature forward
Use the agent to implement a defined change, work through errors, and run relevant checks. It is useful when the task extends beyond a single code suggestion.
Understand what needs changing
Explore a codebase or review a proposed change to identify the files and behavior involved before editing a product you already maintain.