Codex

Also called: OpenAI Codex, Codex CLI, ChatGPT Codex, Codecs, Kodex

OpenAI's AI coding agent. It reads a project's code, makes changes and runs commands to carry out a task a person describes. It runs in the terminal, in code editors, in the cloud and inside the ChatGPT apps. It is the same kind of tool as Claude Code.

For example: A developer asks Codex to find why a signup form fails on phones. Codex reads the code, proposes a fix and the developer reviews it.