OpenAI's coding agent spanning CLI, IDE extension and cloud sandboxes
Codex is OpenAI's family of coding agents rather than a single application. The command-line tool runs in your terminal and edits the local repository; an IDE extension puts the same agent beside your editor; and a cloud version works on tasks in an isolated environment that can be handed back as a pull request. Tasks can run in parallel, and the agent reads the repository, runs tests and iterates before reporting back. The differentiator is that one product spans local and delegated work, so quick edits stay on your machine while longer jobs can be farmed out and reviewed afterwards.
Last updated: 2026-09-20. This site only provides an index; for exact features, pricing, and licensing, see the official website.
delegated tasks, pull request automation, refactoring, test generation
If you're comparing similar products, check the alternatives below, or browse all tools in the AI Coding & Development category.
The local CLI and IDE extension act on your working copy while you watch. Cloud tasks run in an isolated environment, work in parallel, and come back as a reviewable pull request you can merge or discard.
Yes, in practice. Codex is tied to paid ChatGPT subscription tiers or API usage, and each tier carries its own limits on how much agent work you can run in a given period.
It is designed for real codebases and searches for relevant files rather than ingesting everything. Clear task descriptions, existing tests and repository conventions all improve how well it performs.
Anthropic's terminal-based coding agent that edits and runs your project
Open-source VS Code agent that plans, edits and runs commands on your key
AI-first code editor built for working inside a real repository
The most widely adopted AI pair programmer