# Run Codex in ace

OpenAI's coding agent, run from its own command-line tool.

- Sign in to more than one Codex account and choose which one a thread runs on.
- Approvals and questions show as Approve and Answer, on your desktop and on your phone.

## What Codex gets in ace

- [Agent orchestration](https://acehq.dev/features/orchestration/): Delegate from any agent to any provider
- [Computer use](https://acehq.dev/features/computer-use/): Agents read apps through accessibility, then click and type
- [Fleet](https://acehq.dev/features/fleet/): Agents start threads and open browsers on linked machines
- [iPhone and iPad](https://acehq.dev/features/mobile/): Live Activities that end only when the whole agent tree is done
- [Remote access](https://acehq.dev/features/remote-access/): Sign in with email, Google or GitHub
- [Accounts and limits](https://acehq.dev/features/accounts/): Each account signs in through the CLI's own login, kept apart
- [Browser use](https://acehq.dev/features/browser/): One shared browser: the same tabs and logins for you and agents
- [Devices](https://acehq.dev/features/devices/): Live screen, UI tree, logs and recordings
- [Worktrees and review](https://acehq.dev/features/review/): One git worktree per thread, created for you
- [Thread status](https://acehq.dev/features/status/): Working, Approve, Waiting, Failed and Done

## Set up Codex

1. Install Codex and sign in, the way its own instructions say. ace uses that login as it is.
2. Download ace for your computer and open a project folder.
3. Start a thread and choose Codex. Give it its own worktree if other agents share the repository.

## Questions

### Does ace need a Codex API key?

No. ace starts Codex through its own command-line tool, signed in the way you already use it, so your existing plan keeps working. ace never asks for, stores or proxies credentials.

### Can I run Codex beside other agents?

Yes. Run Codex, Claude Code, Codex, Cursor and others side by side, each thread in its own git worktree, and hand a thread from one agent to another with its context.

### Can Codex hand work to other agents?

Yes. Codex can delegate tasks to agents on other providers and on your other machines with ace's delegate tool, and wait for their results.

### Can Codex use a browser and my desktop apps in ace?

Yes. ace gives Codex the same MCP tools as every other agent: a real browser, computer use, phone simulators, and delegating to agents on other machines.

Page: https://acehq.dev/agents/codex/