Jules vs Codex Cloud
Two cloud coding agents that plan, edit, and open pull requests for you — compared across models, limits, and workflow.
Updated August 28, 2026 · Independent comparison — Jules, Codex Cloud are separate products.
Jules
Google's asynchronous cloud coding agent
Jules is Google's asynchronous coding agent. It clones your repository into a secure cloud VM, writes a plan, executes multi-file changes, and opens a pull request — well suited to bug fixes, version bumps, test coverage, and small features you can hand off. It has a free tier (about 15 tasks/day and 3 concurrent tasks, on Gemini 2.5 Pro); higher limits — roughly 100 tasks/day and 15 concurrent, and up to 300 tasks/day and 60 concurrent on Gemini 3 Pro — come bundled with Google AI Pro and Google AI Ultra subscriptions rather than as a standalone Jules plan. There is no bring-your-own-model option. Jules added MCP server support in February 2026, ships a Jules Tools CLI and a public Jules API, and can automatically analyze and fix a failing CI pipeline on a pull request and re-push.
Codex Cloud
OpenAI's cloud coding agent, part of Codex
Codex Cloud is OpenAI's cloud-based coding agent — the delegated, background side of Codex. It runs multi-step software tasks in isolated cloud sandboxes and can work in parallel across many projects, driven by GPT-5-Codex from the GPT-5 family. Crucially, it is not a separate SKU: cloud tasks are launched from the ChatGPT and Codex surfaces and draw on your existing ChatGPT usage quota, so access comes with the plan you already have (Go, Plus, Pro, Business, or Enterprise) rather than a Codex-specific subscription. You can delegate to it from the Codex CLI, IDE extension, web, or mobile, and it offers GitHub integration, automatic pull-request code review, and Slack integration.
Bottom line
Two cloud coding agents that plan, edit, and open pull requests for you — compared across models, limits, and workflow. Choose Jules if you want a fully async agent that turns work into GitHub pull requests; choose Codex Cloud if you already pay for ChatGPT and want cloud tasks on the same quota, no new SKU.
What It Is
| Feature | Jules | Codex Cloud |
|---|---|---|
| Type | Async cloud coding agent | Cloud coding agent (part of Codex) |
| Vendor | OpenAI | |
| Runs in | Cloud VM per task | Isolated cloud sandbox |
| Output | Opens a GitHub pull request | PR / diff for review |
Access & Limits
| Feature | Jules | Codex Cloud |
|---|---|---|
| Free tier | ~15 tasks/day, 3 concurrent | Included in ChatGPT plans |
| Paid access | Higher limits via Google AI Pro / Ultra | Uses your ChatGPT plan (Go/Plus/Pro) |
| Separate SKU? | No — bundled with Google AI subscriptions | No — same ChatGPT quota |
| Concurrency by tier | 3 (free) → 15 (Pro) → 60 (Ultra) | Parallel tasks across projects |
| Tasks/day by tier | ~15 → 100 → 300 | Not stated |
Models
| Feature | Jules | Codex Cloud |
|---|---|---|
| Default model | Gemini 3 Pro (paid); Gemini 2.5 Pro (free) | GPT-5-Codex (GPT-5 family) |
| Model family | Gemini | GPT-5 |
| Bring-your-own key | ✗ | ✗ |
| In-tool model choice | Not stated | GPT-5 family |
Cloud Agent Workflow
| Feature | Jules | Codex Cloud |
|---|---|---|
| Plans before editing | ✓ | ✓ |
| Multi-file changes | ✓ | ✓ |
| Opens pull requests | ✓ | ✓ |
| CI failure auto-fix | Auto-fixes failing CI and re-pushes | Not stated |
| Automated code review | Not stated | Automatic PR code review |
Integration & Extensibility
| Feature | Jules | Codex Cloud |
|---|---|---|
| GitHub integration | ✓ | ✓ |
| MCP support | Yes (since Feb 2026) | ✓ |
| CLI companion | Jules Tools CLI | Codex CLI (delegates to cloud) |
| Public API | Jules API | Not stated |
| Slack integration | Not stated | ✓ |
The Verdict
Choose Jules if...
- ✓You want a fully async agent that turns work into GitHub pull requests.
- ✓You prefer Gemini models and Google's ecosystem.
- ✓You want a genuinely free tier, then higher limits via Google AI Pro or Ultra.
- ✓You value the CI auto-fix loop that repairs failing pull requests.
- ✓You want up to 60 concurrent tasks and a public API to script against.
Choose Codex Cloud if...
- ✓You already pay for ChatGPT and want cloud tasks on the same quota, no new SKU.
- ✓You prefer GPT-5-Codex and OpenAI's model family.
- ✓You want to delegate from the Codex CLI, IDE, web, or mobile into the cloud.
- ✓You want automatic PR code review and Slack integration.
- ✓You run many parallel cloud tasks across projects in isolated sandboxes.
Frequently Asked Questions
What is the difference between Jules and Codex Cloud?
Jules is Google's asynchronous coding agent. Codex Cloud is OpenAI's cloud-based coding agent — the delegated, background side of Codex.
Should I choose Jules or Codex Cloud?
Choose Jules if you want a fully async agent that turns work into GitHub pull requests. Choose Codex Cloud if you already pay for ChatGPT and want cloud tasks on the same quota, no new SKU.
1DevToolKeep a local cockpit for cloud agents
Jules and Codex Cloud both do their work in the cloud and hand you a pull request. 1DevTool complements that with a local cockpit: run Claude Code, Codex CLI, Gemini CLI, Cline, and OpenCode in persistent terminals to prototype, review, and follow up on what the cloud agents ship. Bring your own keys or subscriptions, no lock-in, plus a built-in HTTP client, 13-engine database client, and embedded browser wired into Send-to-AI. One-time $29, no subscription.