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Cursor Pro vs Codex on ChatGPT Plus (2026): Which $20 Wins?
Cursor Pro vs ChatGPT Plus for Codex at the same $20: usage limits, models, editor vs agent workflow, overage, and which plan gets more coding done per month.
8 min read
Cursor plans and limits from Cursor’s pricing help and usage limits help (verified Oct 24, 2026) and Cursor’s models and pricing docs (verified Oct 27, 2026). Codex on Plus from OpenAI’s Codex pricing page (verified Oct 28, 2026). Every source is listed at the bottom. No affiliate links on this page (how we work).
Two $20 plans walk into a bar. Only one of them is still for sale.
Cursor Pro is a legacy plan. Cursor says its legacy plans “aren’t available to new customers, but existing subscribers keep them” (verified Oct 24, 2026). ChatGPT Plus is still $20 a month and includes Codex on the web, in the CLI, in the IDE extension and on iOS. So “Cursor Pro vs Codex Plus” splits into two answers depending on whether you already have Cursor Pro. This page is only about the two $20 plans; the broader product fight is on Cursor vs Codex.
Quick answer (Oct 29, 2026)
- Buying today, $20 budget: ChatGPT Plus for Codex. Cursor has no $20 plan on its current lineup; it’s Plus at $8 or Premium at $30.
- Already on legacy Cursor Pro: keep it if you like Cursor’s editor and use GPT or Claude inside it. Pro still includes a monthly pool for third-party models, which no new Cursor plan does.
- You want Cursor’s editor and Codex’s limits: Codex’s IDE extension lists Cursor as a supported editor, so ChatGPT Plus works inside Cursor. Add Cursor Plus at $8 only if you want Cursor’s own models too.
- You keep hitting Codex’s five-hour cap: Pro starts at $100 and “currently” has no five-hour limit.
The $20 table
| Plan | Price | Limits | Overage |
|---|---|---|---|
| Cursor Pro | $20/mo, legacy | 2 monthly pools | On-demand |
| Cursor Premium | $30/mo | 4x Plus, weekly | Prepaid credit |
| ChatGPT Plus | $20/mo | Per 5h + weekly | ChatGPT credits |
USD. Cursor: pricing help, verified Oct 24, 2026; “Prices exclude tax”; Premium is $300 a year billed annually. Codex: Codex pricing, verified Oct 28, 2026. Cursor Premium is in the table because it’s the plan Cursor maps legacy Pro to.
What $20 gets you in Cursor
If you have legacy Pro, you get “two monthly usage pools and on-demand usage” (models and pricing docs, verified Oct 27, 2026). One pool is Cursor Models; the other is Other Models, for third-party models “drawn down at each model’s API price”. Pro also includes “unlimited Tab completions, Bugbot, Cloud Agents, Automations, Origin, and the Cursor SDK” (legacy plans docs, verified Oct 24, 2026).
How big are those pools? Not published. The pools reset monthly with your billing cycle, the reset date is on the Spending tab, and “Unused included usage does not roll over” (usage limits help, verified Oct 24, 2026). When you run out, you turn on on-demand usage (off by default on individual plans; set a spend limit) or upgrade.
If you’re buying today, Cursor maps legacy Pro at $20 to Premium at $30 and is upfront that “Comparable means the closest tier, not an identical one.” Each new plan “includes at least twice as much coding usage with Cursor models as the legacy plan it replaces,” but it “drops the included third-party model allowance” (pricing help, verified Oct 24, 2026). On Premium, GPT and Claude bill at API list price from prepaid credit, from the first request.
Premium’s pool is “4x Plus” and refreshes weekly. Plus’s pool size isn’t published, so 4x of it isn’t either. It’s like being told your car does four times the mileage of a car whose mileage is classified.
Switching from legacy Pro is optional, and Cursor warns “the change is permanent”. This is the Highlander rule of plan migrations: once you leave, there can be only one, and it isn’t the old one.
What $20 gets you in Codex on ChatGPT Plus
ChatGPT Plus includes “Codex on the web, in the CLI, in the IDE extension, and on iOS,” plus cloud integrations like automatic code review and Slack (Codex pricing, verified Oct 26, 2026).
OpenAI is the only one of the two that publishes numbers. Its estimates of local messages per five hours on Plus (verified Oct 28, 2026):
| Model | Per 5 hours |
|---|---|
| GPT-6 Luna | 350–3,000 |
| GPT-6.1 Terra | 35–285 |
| GPT-6.1 Sol | 15–160 |
| GPT-6 Sol | 15–150 |
| GPT-6 Astra | 5–45 |
Source: Codex pricing, verified Oct 28, 2026. OpenAI: “These estimates are not fixed message limits.”
GPT-6.1 Terra is the new middle gear. It’s “available in Work and Codex on Plus, Pro, Business, Enterprise, and Edu plans,” and OpenAI says “Overall Work and Codex plan limits are unchanged.” Per OpenAI, the same allowance “covers more tasks than with GPT-5.6 Terra and substantially more than with GPT-6.1 Sol or GPT-6 Astra,” while “For the most complex coding tasks, GPT-6.1 Sol and GPT-6 Astra remain the better choice” (OpenAI, verified Oct 28, 2026). Those are OpenAI’s claims, not our benchmark.
The fine print that shrinks those ranges:
- Weekly limits: “Weekly limits may also apply.” Their size isn’t published.
- Cloud costs more: local messages and cloud chats share one allowance, and cloud tasks “may use more of your allowance than local messages.”
- Fast mode: burns included usage 2.5x faster.
- New chat, same meter: “Starting a new chat does not reset your usage limits” (Codex help, verified Oct 26, 2026).
At the cap, Plus users can buy ChatGPT credits, apply a reset if they have one, upgrade, or wait. The price per credit isn’t published: it “depend[s] on your plan or agreement.” You can also run extra local chats on an API key at standard API rates. Full detail is on Codex usage limits.
Neither company tells you how much $20 actually buys. Cursor hides the pool size completely; OpenAI gives a 15–160 range and an unnumbered weekly cap. I’ll take a range over a blank, but for a product sold to engineers, “it depends, check your dashboard” is a frustrating answer to “how much do I get?”
Which hits limits first?
Honestly, nobody can tell you from public numbers, and anyone who does is guessing. Cursor doesn’t publish Pro’s pool size, so there’s nothing to compare against OpenAI’s ranges. What you can compare is how each one fails:
- Cursor legacy Pro: a monthly pool. Burn it in week two and you’re on on-demand billing or waiting for your billing date.
- Codex on Plus: a five-hour window plus a weekly cap. A heavy morning locks you out for the afternoon, not the month, but a heavy week can still stop you.
- Model choice moves Codex a lot: on OpenAI’s own estimates, GPT-6 Luna’s range tops out at 3,000 messages per five hours versus 160 for GPT-6.1 Sol. Pick the model to fit the task and Plus stretches.
Who should pick which, and when to stack both
- New buyer, one $20 subscription: ChatGPT Plus. It’s the only one of the two you can buy, and it comes with published limits and Terra as a cheaper middle model.
- Legacy Cursor Pro holder who leans on GPT or Claude inside Cursor: stay put. Your third-party pool is the thing every new Cursor plan dropped, and switching is one-way.
- You love Cursor’s editor but want Codex limits: install the Codex extension in Cursor; OpenAI’s IDE page lists Cursor among supported editors (Codex IDE, verified Oct 26, 2026).
- You want both Cursor’s models and Codex: Cursor Plus at $8 plus ChatGPT Plus at $20 is $28 a month, $2 less than Cursor Premium on its own, which bills GPT on top at API list price anyway.
- Codex caps every day: that’s an upgrade question, not a Cursor one. Pro starts at $100; see Codex pricing.
The stacking math is the Everything’s Coming Up Milhouse moment of this comparison: the cheapest way to get “Cursor plus GPT” is to not buy the Cursor plan that includes GPT.
Weighing Claude at the same price instead? See Cursor Pro vs Claude Pro. Cursor’s meter is explained on Cursor usage limits, and the wider field is on AI coding tools compared.
Here’s what I’d do
I haven’t run either plan for a month; this is a read of both vendors’ pages. Buying today with $20, I’d get ChatGPT Plus, default Codex to GPT-6.1 Terra for everyday work, and save GPT-6.1 Sol for the gnarly tasks. If I were already on legacy Cursor Pro, I wouldn’t cancel it on reflex. I’d keep it until the third-party pool stops earning its $20.
Going heavier than $20? Cursor Ultra vs ChatGPT Pro runs the same comparison at the $200 tier.
For the GitHub version of this choice, see Copilot Pro vs ChatGPT Plus for coding.
FAQ
Is Cursor Pro better than Codex? For new buyers it’s not an option, since Cursor Pro is a legacy plan closed to new customers; ChatGPT Plus at $20 is the purchasable $20 choice for Codex (checked Oct 29, 2026).
Cursor Pro vs ChatGPT Plus for coding? Cursor Pro is an editor with two unpublished monthly pools, while ChatGPT Plus gives Codex in the web, CLI, IDE extension and iOS with published per-five-hour estimates.
Which hits limits first? It can’t be measured from public numbers because Cursor doesn’t publish Pro’s pool size; Codex on Plus resets every five hours with a weekly cap, Cursor Pro monthly.
Can I still buy Cursor Pro? No, Cursor’s legacy plans aren’t available to new customers, and the closest new tier is Premium at $30 a month.
Can I use Codex inside Cursor? Yes, OpenAI’s Codex IDE page lists Cursor as a supported editor for the Codex extension, signed in with your ChatGPT plan.
Sources
- Cursor, Pricing help (lineup, annual prices, legacy mapping Pro → Premium, “comparable” wording, dropped third-party allowance, legacy not sold to new customers): https://cursor.com/help/account-and-billing/pricing (verified 2026-10-24)
- Cursor, Legacy Cursor plans (what Pro includes; pool sizes not published): https://cursor.com/docs/account/pricing/legacy-cursor-plans (verified 2026-10-24)
- Cursor, Usage limits help (monthly vs weekly resets, no rollover, on-demand, prepaid credit): https://cursor.com/help/models-and-usage/usage-limits (verified 2026-10-24)
- Cursor, Models & Pricing (legacy pools wording, switching): https://cursor.com/docs/models-and-pricing (verified 2026-10-27)
- OpenAI, Codex pricing (Plus $20, per-5-hour estimates incl. GPT-6.1 Terra, weekly limits, Fast mode, Plus surfaces, Pro from $100): https://developers.openai.com/codex/pricing (verified 2026-10-28)
- OpenAI, Introducing GPT-6.1 Terra: https://openai.com/index/introducing-gpt-6-1-terra (verified 2026-10-28)
- OpenAI Help, Using Codex with your ChatGPT plan (options at the cap, new chat doesn’t reset): https://help.openai.com/en/articles/11369540-using-codex-with-your-chatgpt-plan (verified 2026-10-26)
- OpenAI, Codex IDE extension (supported editors incl. Cursor): https://developers.openai.com/codex/ide (verified 2026-10-26)