Cursor and OpenAI Codex both let you describe a change and have an AI make it across your files. They start from opposite ends: Cursor is an editor with an agent inside, while Codex is an agent that you can reach from several places.
The short version
| Cursor | OpenAI Codex | |
|---|---|---|
| What it is | A code editor with AI built in | A coding agent with a CLI, an IDE extension and a cloud service |
| Where you work | Its own editor, built on a VS Code foundation | Terminal, an editor sidebar (VS Code, Cursor and Devin Desktop, formerly Windsurf, are supported), or the cloud |
| Free plan | Yes, with limited agent and chat requests | Sign in with a ChatGPT account (OpenAI recommends a paid plan) or use an API key. Check which plans include it |
| Open source | No | Yes (the CLI) |
| MCP servers | Yes | Yes |
| Standing instructions | .cursor/rules and AGENTS.md | AGENTS.md |
Check Cursor's pricing and OpenAI's pricing pages for current details.
How they feel to use
Cursor is a full editor. You see your files, the AI's proposed edits and a chat panel in one window. That visual loop is easier to follow if you're newer to code, and it includes fast autocomplete as you type.
Codex is flexible about where you use it. In the terminal you chat with it from your project folder. The IDE extension puts it in a sidebar, and OpenAI's docs say it can also create and track cloud tasks, where the work runs on OpenAI's side while you do something else. You sign in with a ChatGPT account, and some features, such as cloud tasks, may not be available if you use an API key instead.
Safety and control
Both ask before doing risky things. Codex's docs describe two separate controls: an approval setting, which governs when it asks you, and a sandbox, which limits what it can touch. In the IDE extension, the default Agent mode can read, edit and run commands in your working directory, and asks before going outside it or using the network. There are also a Chat mode for planning, and a Full Access mode, which is meant for people who understand the risks.
Whichever you use, keep your work in Git so you can step back. Our Git guide explains how.
Where Cursor is stronger
- A gentler start. One window, a familiar layout and a free plan to try.
- Targeted rules.
.cursor/rulescan limit instructions to particular files. See Give Cursor standing instructions with project rules. - Everything in one place. Editing, chatting and autocomplete live in a single app.
Where Codex is stronger
- Choice of surface. Terminal, editor or cloud, with one account across them.
- Background work. Cloud tasks let you hand off a job and come back to review it.
- Open source CLI. You can read the code, and it installs with
npm install -g @openai/codex. - Fits your editor. If you like your current editor, the extension works inside several, including Cursor itself.
What they share
Both support MCP (Model Context Protocol, a standard way to plug extra tools into an AI) and both read AGENTS.md, so a single file of project instructions can serve both. Both can edit many files from one request, and both need you to review the output.
Who should pick what
- You've never coded and want a visual start: Cursor.
- You already pay for ChatGPT: Codex signs in with that account, so you may not need a separate subscription. Check what your plan includes.
- You like terminals or want to delegate jobs to run in the background: Codex.
- You want both: Install the Codex extension in Cursor and compare them on the same task.
For a terminal-versus-terminal view, see Claude Code vs OpenAI Codex. If your main question is editor versus add-on, read Cursor vs GitHub Copilot.
Our verdict
This is less of a rivalry than it looks. Cursor is the easier way in for most beginners, thanks to its visual editor and free plan. Codex is the better fit if you already have a ChatGPT plan or want to work from the terminal or the cloud. Because Codex's extension can sit inside Cursor, you don't have to choose permanently.