9router/gitbook/content/en/integration/codex.md

OpenAI Codex CLI Integration

Integrate 9Router with OpenAI Codex CLI to route your OpenAI API requests through 9Router's intelligent routing system.

Prerequisites

• OpenAI Codex CLI installed
• 9Router running locally or cloud endpoint configured
• API key from 9Router dashboard

Setup

1. Configure Environment Variables

Set the following environment variables in your shell configuration file (~/.bashrc, ~/.zshrc, or ~/.bash_profile):

# Base URL for 9Router
export OPENAI_BASE_URL="http://localhost:20128/v1"

# API Key from 9Router dashboard
export OPENAI_API_KEY="your-9router-api-key"

2. Reload Shell Configuration

source ~/.zshrc  # or ~/.bashrc

3. Verify Configuration

Check that the environment variables are set correctly:

echo $OPENAI_BASE_URL
echo $OPENAI_API_KEY

Available Models

9Router provides the following Codex models:

Model ID	Description
cx/gpt-5.2-codex	GPT-5.2 Codex - Latest version
cx/gpt-5.1-codex-max	GPT-5.1 Codex Max - Extended context

Usage Examples

Basic Usage

# Use GPT-5.2 Codex
codex --model cx/gpt-5.2-codex "Write a function to sort an array"

# Use GPT-5.1 Codex Max
codex --model cx/gpt-5.1-codex-max "Explain this complex algorithm"

Code Generation

codex --model cx/gpt-5.2-codex "Create a REST API endpoint for user authentication"

Code Explanation

codex --model cx/gpt-5.1-codex-max "Explain what this code does: $(cat myfile.js)"

Configuration File

You can also configure Codex CLI using a configuration file. Create or edit ~/.codex/config.json:

{
  "baseUrl": "http://localhost:20128/v1",
  "apiKey": "your-9router-api-key",
  "defaultModel": "cx/gpt-5.2-codex"
}

Troubleshooting

Authentication Errors

If you encounter authentication errors:

1. Verify your API key is correct in 9Router dashboard
2. Check that OPENAI_API_KEY environment variable is set
3. Ensure the API key has not expired

Connection Issues

If you encounter connection errors:

1. Verify 9Router is running: curl http://localhost:20128/health
2. Check environment variables are set correctly
3. Ensure no firewall is blocking port 20128

Model Not Available

If you get "model not available" errors:

1. Verify the model name matches your 9Router configuration
2. Check that the OpenAI provider connection is active in 9Router dashboard
3. Ensure the model is available in your connected providers

Cloud Endpoint

To use 9Router cloud endpoint instead of localhost:

export OPENAI_BASE_URL="https://9router.com"

Make sure you have configured your API key in the 9Router cloud dashboard.

Advanced Configuration

Custom Timeout

export OPENAI_TIMEOUT=60  # seconds

Debug Mode

Enable debug mode to see detailed request/response logs:

export CODEX_DEBUG=true
codex --model cx/gpt-5.2-codex "Your prompt"