Quick answer
Every ChatGPT plan includes Codex, from Free and Go to Plus, Pro, Business, Edu, and Enterprise. Plus and Business get a five-hour window plus weekly limits. Pro has no five-hour limit right now. OpenAI lists message ranges per model on its pricing page.
Codex by ChatGPT plan
| Plan | Price | Codex limits |
|---|---|---|
| Free | $0 | Included, with lower limits than Plus |
| Go | $8 a month | Included, with lower limits than Plus |
| Plus | $20 a month | Five-hour window and weekly limits |
| Pro | From $100 a month | No five-hour limit, weekly limits may apply |
| Business | $20 a user, billed yearly | Five-hour window and weekly limits |
| Edu, Enterprise | Contract | Set by workspace |
From OpenAI's Codex pricing page in October 2026.
What drains the allowance faster
- Bigger models. OpenAI's ranges per five hours differ a lot between models.
- Fast mode, which uses the allowance 2.5 times faster, and Ultrafast at 8 times.
- Cloud tasks, which share the allowance with local messages.
Check what you actually use
Message ranges are wide because tasks differ. Your own numbers are more useful. UsageAtlas shows the Codex windows live and keeps token history by model, so you can see which plan your weeks fit.
Questions, answered
Does ChatGPT Plus include Codex?
Yes. Plus includes Codex with a five-hour window and weekly limits.
Does ChatGPT Pro have a Codex limit?
Pro has no five-hour limit right now. OpenAI says weekly limits may still apply.
Why does OpenAI give a range instead of a number?
A message that reads one file costs far less than one that edits twenty. The range covers both.