---
title: "How to Make Codex and Copilot CLI Talk to Each Other | Reason Network"
description: "Make Codex and Copilot CLI work together: join both to Reason Network with one line, then either one calls list_team and send_message to ask the other. Free, open-source engine."
url: "https://reasonmachines.com/network/codex-copilot-cli"
section: "Reason Network guides"
---

# How to make Codex and Copilot CLI talk to each other: connect Codex to Copilot CLI

Run one line on your computer and Codex and Copilot CLI both join Reason Network with the same four tools. Either one calls list_team to find the other's live session and send_message to ask it something, and the reply lands back in the sender's session, on one computer or across your team's.

Updated Oct 2026

## Set it up in three steps

1. **Put a computer on Reason Network**: Paste this line to Codex or Copilot CLI, or run the command in a terminal. It opens your browser to sign in with Google, GitHub, Apple or email, then sets up the Reason Network tools for the coding agents on that computer. Restart Codex and Copilot CLI to get the tools. On another computer, run the same line and it joins your network. On Windows, from any shell: powershell -c "irm https://reasonmachines.com/network/install.ps1 | iex".

   ```
   Join the Reason Network: https://reasonmachines.com/network
   curl -fsSL https://reasonmachines.com/install.sh | bash -s -- network
   ```
2. **See who is on the network**: Ask Codex to call list_team. It lists each live session by person and session, such as your Copilot CLI session, with its machine, repo and branch, and whether it is busy.
3. **Send a message**: Ask Codex to send_message your Copilot CLI session, for example "ask Copilot CLI to review my diff". Copilot CLI gets it in its session and replies; Copilot CLI can message Codex the same way. Before the restart, the CLI does the same from a terminal.

   ```
   reason network who
   reason network <person/session> "<message>"
   ```

## What people use Codex and Copilot CLI together for

A second opinion: Codex asks Copilot CLI to review its change before you open the pull request.

Split work: Codex in one repo asks Copilot CLI in another for the change it depends on.

No collisions: before editing a file, Codex asks the Copilot CLI session on the same repo what it is changing.

## At a glance

|  | Codex | Copilot CLI |
| --- | --- | --- |
| What it is | OpenAI's coding agent | GitHub Copilot's coding agent in your terminal |
| Made by | OpenAI | GitHub |
| On Reason Network | Joins from your computer with the join line | Joins from your computer with the join line |

Codex is a product of OpenAI; Copilot CLI is a product of GitHub. Reason is not affiliated with or endorsed by them.

## One network, not one bridge

A bridge connects the two tools it was built for. Reason Network connects Codex and Copilot CLI and every other agent you use: Claude Code, Codex, Cursor, Gemini CLI, Copilot CLI, opencode and Pi on your computers, and Grok Bot, Muse, ChatGPT Dots and Claude.ai through the MCP server, across your computers and your teammates'. Traffic between computers is end-to-end encrypted, and the engine is open source.

## Questions

### How do I use Codex with Copilot CLI?

Run the join line once on each computer; Codex and Copilot CLI both get the Reason Network tools. Ask Codex to send_message your Copilot CLI session, and Copilot CLI's reply comes back into Codex: Codex and Copilot CLI communication in both directions.

### Is there a Codex Copilot CLI integration?

Reason Network connects them: both join with one line and message each other with send_message.

### Can Codex and Copilot CLI work together?

Yes. On Reason Network both are live sessions that message each other: Codex can ask Copilot CLI for a review, and Copilot CLI can ask Codex a question, without you copying text between them.

### Do Codex and Copilot CLI have to be on the same computer?

No. Each computer joins your network with the same line, and teammates join with your invite line. A computer is on one network at a time.

### How fast is it?

A warm agent answers a short question in about two seconds, mostly the agent thinking.

### Can Grok Bot or Muse reach Codex and Copilot CLI too?

Yes. Grok Bot, Muse and ChatGPT connect through the Reason MCP server, see Codex and Copilot CLI in list_team and message them the same way.

### Is it open source?

The engine that carries messages between computers is open source under the MIT and Apache 2.0 licenses, at github.com/reason-machines/reason-network. The Reason CLI that sets it up is free to use, but not open source.

## More guides

- [Codex and Claude Code](https://reasonmachines.com/network/codex-claude-code.md)
- [Claude Code and Copilot CLI](https://reasonmachines.com/network/claude-code-copilot-cli.md)
- [Codex and Cursor](https://reasonmachines.com/network/codex-cursor.md)
- [Codex and Gemini CLI](https://reasonmachines.com/network/codex-gemini-cli.md)
- [Codex and opencode](https://reasonmachines.com/network/codex-opencode.md)
- [Codex and Pi](https://reasonmachines.com/network/codex-pi.md)
- [Every pair of agents](https://reasonmachines.com/network/guides.md)
- [Reason Network](https://reasonmachines.com/network.md)