[FAQ] Codex Free Tier and Pricing: Is Paying for Go, Plus or Pro Worth It?

Codex is OpenAI’s AI coding agent — it writes code, fixes bugs, and refactors software on its own, working through a command line (CLI, meaning you type commands instead of clicking buttons), a web version, a desktop app, and plugins for VS Code, JetBrains and Xcode. It doesn’t have its own subscription. It rides inside ChatGPT’s existing plans, which makes the pricing question — free tier and pricing and whether it’s worth it — harder to answer than it should be.

We went back to the source to check exactly what each tier gives you, and ran into a wall doing it. Here’s what we found.

What does Codex actually cost?

There’s no standalone “Codex plan.” You get Codex by having a ChatGPT account, and what you can do with it depends on which ChatGPT tier you’re on.

Free: a free ChatGPT account gets you Codex, but access is “Limited.” OpenAI doesn’t publish exact numbers for what Limited means in terms of daily or monthly usage. If you run the CLI version with your own API key (API here means a direct pay-per-use connection to the model, billed by how much you use, not a flat fee), you pay for that usage separately, outside the ChatGPT subscription.

ChatGPT Go — US$8/month: Codex is still Limited here, per OpenAI’s own site menu. Paying US$8 doesn’t unlock full use — it’s grouped with the free tier in terms of Codex capability, just attached to the Go plan.

ChatGPT Plus — US$20/month: this is where Codex opens up. OpenAI’s menu marks Plus as “Codex Yes,” with what they call “Expanded usage.” This is the first tier that gives you full, non-Limited access to the coding agent.

ChatGPT Pro — US$100/month: Codex gets its biggest allowance here. Based on independent sources (more on why we had to rely on those below), Pro at US$100/month gives roughly 5 times the Plus quota, and a second Pro tier at US$200/month gives roughly 20 times the Plus quota.

Codex supports commercial use on all these tiers, including the free one — there’s no “personal use only” restriction in what we verified. There’s also no watermark added to code it generates. What we couldn’t verify: how often the free tier’s “Limited” quota resets. OpenAI doesn’t publish a reset window for it, so if you’re on the free tier, don’t assume a clean monthly or daily reset — we found no stated cycle.

Figure: compiled by AMPM from its verified data (last verified 2026-10-11).

Go vs Plus vs Pro: what changes at each price?

The jump that matters most is Go to Plus. Go keeps you at Limited despite the US$8 fee — functionally close to free, just paid. Plus at US$20 is where Codex becomes usable for real daily coding work, with Expanded usage instead of Limited. Pro at US$100 or US$200 is a multiplier on top of Plus, not a different feature set — you’re paying for volume (5x or 20x Plus quota), not new capabilities.

If your work is occasional — reviewing a PR, generating a quick script — Limited access on free or Go may be enough. If Codex is part of your daily workflow, Plus is the realistic entry point. Pro only makes sense if you’re burning through Plus’s Expanded usage regularly and need the extra ceiling.

Quick answers to what people keep asking

Does the free tier include commercial use? Yes. Our check confirms commercial_use is allowed on the free tier, same as paid tiers.

Illustration: Paying for the entry tier grants the exact same restricted access as the free plan, with no extra capacity unlocked.

Does the free quota reset on a schedule? OpenAI doesn’t say. We found no published reset window — treat the free tier’s Limited quota as unpredictable, not a clean daily or monthly reset.

Can I use Codex without paying anything extra, using my own API key? Yes, on the CLI version. But that routes through separate API billing based on usage, not the free ChatGPT quota — you’re paying OpenAI directly for tokens (tokens are the units of text the model processes, and API usage is billed by how many you use), outside the US$8/US$20/US$100 subscription prices.

Is there a refund policy for annual plans? There’s no annual plan in what we verified — all three paid tiers (Go, Plus, Pro) are billed monthly, at US$8, US$20 and US$100. We found no yearly pricing and no refund terms published for Codex specifically.

Does paying for Go actually unlock more Codex usage than free? Based on OpenAine’s own menu, no — Go keeps Codex at Limited, the same designation as the free tier. The US$8 fee buys other ChatGPT Go features, not expanded Codex access.

🔍 AMPM exclusive check

Here’s the gap between what OpenAI says and what we could actually confirm. When we rechecked on 2026-08-11, all four official entry points for Codex pricing — openai.com/codex/, openai.com/chatgpt/pricing/, chatgpt.com/pricing/, and help.openai.com — returned HTTP 403 errors. That’s a “blocked” response, not a “page doesn’t exist” response, and it held across multiple retry paths.

That means the Pro tier numbers in this piece — US$100/month for 5 times the Plus quota, US$200/month for 20 times the Plus quota — come from independent third-party sources cross-checking each other, not from us reading OpenAI’s own page directly at the time of that check. We’re flagging this because a vendor page returning 403 on a pricing page, repeatedly, across four separate URLs, is unusual, and readers should know these Pro figures carry that asterisk. Everything else in this piece — the free tier’s Limited status, Go’s US$8 price with Limited Codex, Plus’s US$20 price with Expanded usage, commercial use being allowed, no watermark — matches what we could read directly on OpenAI’s site as of our last verification on 2026-10-11, and was re-confirmed as unchanged on 2026-10-14.

☀️ AMO, the budget-minded cat

AMO only cares about one thing: can I get away with not paying. Here’s the honest read on Codex.

Free gets you Codex access tied to a free ChatGPT account, but it’s Limited, and OpenAI doesn’t say how often that Limited quota resets. If you’re writing a script once a week, or asking Codex to fix one bug at a time, free might genuinely cover it. No commercial restriction, no watermark on what it generates — that part’s solid even on free.

Where it breaks down: Go, at US$8/month, doesn’t actually buy you more Codex. It’s still Limited. So if your plan was “pay a little to get past the free limits,” Go isn’t that plan — you’d be paying US$8 for other ChatGPT Go features while Codex stays exactly as restricted as it is for free users.

The real upgrade is Plus at US$20/month, where Codex switches to Expanded usage — full access, not Limited. That’s the first price point where paying actually changes what Codex can do for you. Pro at US$100 or US$200 a month is a volume play (5x or 20x Plus’s quota) for people already maxing out Plus — not a tier AMO would recommend unless you’re coding for a living and hitting real caps.

AMO’s verdict: free is fine for light, occasional use. Skip Go. If you need it daily, Plus is where the money actually buys something.

Verdict: who should use it, who should skip it

Use the free tier if you’re an occasional coder — someone who needs Codex a few times a week for small tasks and doesn’t mind an undefined, possibly tight Limited quota. Commercial use is allowed, so solo freelancers testing it out have nothing to worry about on that front.

Skip Go. At US$8/month it doesn’t unlock anything Codex-specific over free — same Limited access, different plan name.

Go straight to Plus at US$20/month if Codex is part of your regular workflow. It’s the only tier under US$100 that moves you from Limited to Expanded usage, which is the actual functional upgrade.

Consider Pro (US$100 or US$200/month) only if you’re already on Plus and consistently hitting its usage ceiling. Treat the 5x/20x multiplier figures with some caution — they come from third-party cross-checks, not a page we could load directly on OpenAI’s own site at the time of our recheck.

Written: 2026-10-14 Price last verified: 2026-10-11 Tool last health-checked: 2026-10-14

🔗 Related on AMPM

• Codex pricing & free tier

📎 Sources

All prices and quotas in this article come from AMPM’s verified dataset for Codex (last verified 2026-10-11); primary sources:

• https://openai.com/codex/

🐾 Meet the cats: AMO and PIMI

AMPM is a Taiwan-based AI-tool pricing watchdog. Our motto: ask before you subscribe. Two cats argue every tool from two sides:

• ☀️ AMO — the budget-minded cat. Always asks: is the free tier enough, and is paying actually worth it?
• 🌙 PIMI — the performance-minded cat. Cares about whether it works well, fast, and gets your job done.

When they are done arguing, you know whether to pay. Every number is checked by us, with the verification date at the end.

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