Codex vs Cursor: which AI coding agent should you pick?
Two AI coding agents are fighting for the same budget line. The choice comes down to where your team already lives and how much of the workflow you want the AI to own.
Codex: for teams already inside the ChatGPT ecosystem
OpenAI Codex is a coding agent that runs inside the ChatGPT desktop app, the CLI, an IDE extension, and the web. It’s included in ChatGPT Free and Go plans, with cloud agents available on Plus, Pro, and business plans.
The standout capability is parallel execution: multiple agents can run simultaneously, which matters when you’re juggling several tasks across a larger codebase. Codex also reviews pull requests automatically, which cuts one manual step from the review cycle. It extends through plugins and supports MCP and Skills for customization. Models are limited to OpenAI’s own lineup.
Cursor: for developers who want AI inside the editor
Cursor is an AI-first code editor. The agent, chat, and completions all live inside the place you write code, not in a separate app or browser tab. It runs on its own app, CLI, cloud, and mobile.
Cursor’s free plan includes limited requests. It supports several models, including Grok models, which gives you more flexibility on the underlying engine. Customization comes through Rules and MCP. AI code review is listed as a feature, though the automatic PR review workflow is more prominent in Codex.
The quick comparison
| Codex | Cursor | |
|---|---|---|
| What you get | OpenAI’s coding agent | AI coding agent and editor |
| Where you use it | ChatGPT desktop, CLI, IDE extension, web | Cursor app, CLI, cloud, mobile |
| Free access | Included in ChatGPT Free and Go | Free plan with limited requests |
| Cloud agents | Codex Cloud on Plus, Pro, business plans | Cloud agents listed |
| PR reviews | Automatic | AI code review listed |
| Models | OpenAI models only | Several, including Grok models |
| Extending it | Plugins, MCP, Skills | Rules, MCP |
Which one fits your situation
Pick Codex if your team is already paying for ChatGPT and wants parallel agents plus automated PR reviews without switching editors. Pick Cursor if the editor itself is the product and you want AI completions, chat, and agents in one place with more model flexibility.
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