Both cost $20/mo. The difference is what they do.
OpenAI's coding agent: CLI + autonomous cloud PRs
AI-first IDE, multi-file agent edits
Both start at $20/mo, but you are buying different things: Cursor sells the editor and lets you spend its usage pool on any model, while Codex sells OpenAI's agent inside your ChatGPT plan and rides along in whatever editor you already use, including Cursor.
| Attribute | Codex | Cursor |
|---|---|---|
| Entry price | Free tier, then $20/mo ChatGPT Plus | Free Hobby, $20/mo Pro |
| Top individual tier | $100/mo Pro 5x, $200/mo Pro 20x | $200/mo Ultra |
| What the top tier buys | 5x or 20x the Plus allowance: roughly 200 to 2,000 GPT-5.6 Sol messages per 5-hour window on Pro 20x, plus Codex-Spark | The largest included usage pool on both model pools, then on-demand usage at each model's API rate |
| Where it runs | CLI, web, cloud, iOS, and an IDE extension for VS Code, Cursor, Windsurf, Xcode and JetBrains | Its own VS Code fork, plus a CLI, cloud agents and iOS |
| Model choice | OpenAI only: GPT-6 Astra, GPT-5.6 Sol, Terra and Luna, plus GPT-5.3-Codex-Spark on Pro | Cursor Grok 4.6, Grok 4.5 and Composer 2.5 in the first-party pool, plus Claude, Gemini and GPT in the third-party pool |
| ChatGPT plan inside Cursor | Yes: install the Codex extension in Cursor and sign in with ChatGPT | No: Cursor's own agent bills to a Cursor plan or your own API key, not to a ChatGPT subscription |
| Team pricing | $20/user/mo Business billed annually, $25 billed monthly | $40/user/mo Teams Standard, $120/user/mo Teams Premium |
Both start at $20/mo, but you are buying different things: Cursor sells the editor and lets you spend its usage pool on any model, while Codex sells OpenAI's agent inside your ChatGPT plan and rides along in whatever editor you already use, including Cursor.
Neither at the first paid tier: Codex comes with $20/mo ChatGPT Plus and Cursor's first paid plan is $20/mo Pro. Codex also runs on the ChatGPT Free plan, and OpenAI currently includes it in the $8/mo ChatGPT Go plan for a limited time. At the top the order flips in Codex's favour again: ChatGPT Pro starts at $100/mo for 5x Plus usage, where Cursor's highest individual plan is $200/mo Ultra. For teams Cursor is the pricier side, at $40/user/mo against $25/user/mo for ChatGPT Business billed monthly.
They meter differently. ChatGPT Pro 20x at $200/mo buys 20x the Plus allowance, roughly 200 to 2,000 GPT-5.6 Sol messages per rolling 5-hour window, and when you run out you buy credits or wait for the window to reset. Cursor Ultra at $200/mo buys the largest included usage pool and then keeps going on on-demand billing at each model's API rate, so it never hard-stops but the bill can pass $200. Pick Codex Pro if you want a predictable ceiling on OpenAI models, Ultra if you want model choice and are willing to pay overage.
Yes, for Codex itself. OpenAI ships a Codex IDE extension that installs into Cursor as well as VS Code and Windsurf, and it prompts you to sign in with your ChatGPT account or an API key, so Codex work bills against your ChatGPT plan while running inside Cursor. It does not make Cursor's own features free: Tab, inline edit, Composer and Bugbot still draw on a Cursor plan or your own API key. Practically, a $20 ChatGPT Plus plan plus free Cursor Hobby gets you the Codex agent in the Cursor window without a second subscription.
Codex meters messages per rolling 5-hour window and varies them by model: OpenAI estimates 10 to 100 GPT-5.6 Sol local messages per window on Plus, 50 to 500 on Pro 5x and 200 to 2,000 on Pro 20x, with weekly limits also possible and cloud chats drawing from the same allowance. Cursor meters money, not messages: every plan includes an amount of model usage across a Cursor Models pool and an Other Models pool, and once that is consumed you either add on-demand usage at API rates or upgrade. Cursor's own guidance puts daily agent users at $60 to $100/mo of usage and power users at $200+.
For most people the honest answer is that they are not substitutes. Cursor is an IDE and Codex is an agent, and the Codex extension runs inside Cursor. Choose Cursor when the editor experience matters, when you want Claude or Gemini on the same task as GPT, or when you are buying seats for a team. Choose Codex when you already pay for ChatGPT, when you want the same agent in the terminal, the browser and your editor, or when you want OpenAI's deepest reasoning models with a fixed monthly ceiling.
OpenAI's coding agent: CLI + autonomous cloud PRs. It sits in the coding agents category, and ships in 1 tested stack here.
AI-first IDE, multi-file agent edits. It sits in the ai ides category, and ships in 6 tested stacks here.
They are alternatives at the same step, so most stacks pick one or the other. No aistack.sh stack uses both today, though nothing prevents a custom workflow.
Beyond each other, Codex's closest alternatives are Claude Code, GitHub Copilot, Windsurf. Cursor's closest alternatives are Claude Code.
