---
title: "How to Make Codex and Pi Talk to Each Other | Reason Network"
description: "Make Codex and Pi 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-pi"
section: "Reason Network guides"
---

# How to make Codex and Pi talk to each other: connect Codex to Pi

Run one line on your computer and Codex and Pi 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 Pi, 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 Pi 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 Pi session, with its machine, repo and branch, and whether it is busy.
3. **Send a message**: Ask Codex to send_message your Pi session, for example "ask Pi to review my diff". Pi gets it in its session and replies; Pi 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 Pi together for

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

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

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

## At a glance

|  | Codex | Pi |
| --- | --- | --- |
| What it is | OpenAI's coding agent | The minimal coding agent for your terminal |
| Made by | OpenAI | Its open-source project |
| 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. Reason is not affiliated with or endorsed by OpenAI.

## One network, not one bridge

A bridge connects the two tools it was built for. Reason Network connects Codex and Pi 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 Pi?

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

### Is there a Codex Pi integration?

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

### Can Codex and Pi work together?

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

### Do Codex and Pi 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 Pi too?

Yes. Grok Bot, Muse and ChatGPT connect through the Reason MCP server, see Codex and Pi 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 Pi](https://reasonmachines.com/network/claude-code-pi.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 Copilot CLI](https://reasonmachines.com/network/codex-copilot-cli.md)
- [Codex and opencode](https://reasonmachines.com/network/codex-opencode.md)
- [Every pair of agents](https://reasonmachines.com/network/guides.md)
- [Reason Network](https://reasonmachines.com/network.md)