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Codex vs Jules
Both take coding tasks and work on them in the cloud. Codex comes with ChatGPT and also has an app, CLI and IDE extension; Jules is Google's agent that works on your GitHub repos and opens pull requests.
At a glance
| Fact | Codex | Jules |
|---|---|---|
| Made by | OpenAI | |
| What it is | OpenAI's coding agent for writing, reviewing and shipping code. | Google's asynchronous coding agent that works on your GitHub repos. |
| Price | Included with ChatGPT plans, with limits on Free | Free tier; higher limits with Google AI plans |
| Runs on | macOS, Windows, Linux, Web, CLI | Not stated |
| Open source | No | No |
| Models | Not stated | Gemini 3 Pro, Gemini 2.5 Pro |
| Last verified | October 14, 2026 | October 14, 2026 |
| Official site | openai.com/codex | jules.google |
Where they differ
- Price: Codex is included with ChatGPT plans; Jules has a free tier, with higher limits on Google AI plans.
- Models: Jules runs Gemini; Codex runs OpenAI's models.
- Workflow: Jules takes tasks from GitHub issue labels and shows diffs to approve; Codex runs parallel cloud tasks and reviews PRs.
Which to pick
Choose Codex if you use ChatGPT and want a CLI and IDE tools too.
Choose Jules if you live on GitHub and want an async agent that opens PRs, free to start.
Keep looking
- Codex listing
- Jules listing
- Codex alternatives
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- Codex vs Cursor
- Codex vs GitHub Copilot
- Codex vs Hermes Agent
Facts from each maker's official pages, last verified October 14, 2026. How we verify.