Codex2API

Modern OpenAI compatible API powered by ChatGPT. This project converts Codex quota to OpenAI format API interface, allowing users to use API with just a Plus or Pro account without needing a developer platform account.

Prerequisites

• Python 3.11+
• uv (recommended) for dependency management
• ChatGPT Plus/Pro account for authentication

Quick Start

Installation

uv is a fast Python package manager that provides better dependency resolution, faster installs, and modern Python project management.

# Clone the repository
git clone https://github.com/FF-crazy/Codex2API.git
cd Codex2API

# Install uv if you haven't already
curl -LsSf https://astral.sh/uv/install.sh | sh

# Install dependencies and create virtual environment
uv sync

# Activate virtual environment (optional - uv run handles this automatically)
source .venv/bin/activate  # On Windows: .venv\Scripts\activate

Authentication Setup

Before running the server, you need to set up authentication with your ChatGPT Plus/Pro account: Using Codex, after logging in your account, then run the following command:

1. Run the authentication script to get your token:

   uv run get_token.py

2. Follow the prompts to authenticate with your ChatGPT account

3. The authentication information will be saved to auth.json

Run the Server

Option 1: Quick Start Script (Recommended)

# Make the script executable and run
chmod +x start.sh
./start.sh

The script will automatically:

• Install uv if not present
• Install dependencies
• Check for authentication
• Create .env file from template
• Start the server

Option 2: Manual Start

# Development mode
uv run main.py

The API will be available at http://localhost:{PORT}

Docker Deployment

Using Docker

# Build image
docker build -t codex2api .

# Run container (make sure auth.json exists)
docker run -d \
  --name codex2api \
  -p 11451:11451 \
  -v $(pwd)/auth.json:/app/auth.json:ro \
  -v $(pwd)/models.json:/app/models.json:ro \
  -v $(pwd)/.env:/app/.env:ro \
  -e HOST=0.0.0.0 \
  -e PORT=11451 \
  -e KEY=your-secure-api-key \
  codex2api

Using Docker Compose

The project includes a docker-compose.yml file for easy deployment:

# Start the service
docker-compose up -d

# View logs
docker-compose logs -f

# Stop the service
docker-compose down

Docker Compose Configuration

The docker-compose.yml file includes:

• Port mapping: 11451:11451 (external:internal)
• Environment variables: Pre-configured with sensible defaults
• Volume mounts:
  • auth.json (required for authentication)
  • models.json (model configuration)
  • .env (optional environment overrides)
• Health check: Automatic container health monitoring
• Restart policy: unless-stopped for reliability

Environment Variables in Docker

You can override environment variables in several ways:

1. Modify docker-compose.yml (recommended for permanent changes)

2. Use .env file (mounted as volume)

3. Command line override:

   KEY=your-api-key docker-compose up -d

Note: Make sure you have completed the authentication setup and have auth.json file before running Docker containers.

Testing Docker Setup

To test your Docker configuration:

# Make the test script executable and run
chmod +x docker-test.sh
./docker-test.sh

This script will:

• Build the Docker image
• Run a test container
• Test the health endpoint
• Clean up automatically

Usage

API Authentication

The API requires authentication using the KEY environment variable. By default, it's set to sk-test, but you should change this in production:

• Development: Use sk-test (default)
• Production: Set a secure API key in your environment variables

The API key should be provided in the Authorization header:

Authorization: Bearer your-api-key

OpenAI Client Compatibility

Use any OpenAI client library by changing the base URL:

import openai

# Configure client
client = openai.OpenAI(
    api_key="sk-test",  # Use the KEY from your environment variables
    base_url="http://localhost:11451/v1"  # Note: Docker uses port 11451
)

# Use as normal OpenAI client
response = client.chat.completions.create(
    model="gpt-4",
    messages=[
        {"role": "user", "content": "Hello, world!"}
    ]
)

print(response.choices[0].message.content)

# For reasoning models (o1), you can specify reasoning parameters
reasoning_response = client.chat.completions.create(
    model="o1",
    messages=[
        {"role": "user", "content": "Solve this complex problem step by step..."}
    ],
    reasoning_effort="high",  # User controls reasoning effort
    reasoning_summary="detailed"  # User controls summary format
)

print(reasoning_response.choices[0].message.content)

Available Endpoints

Chat Completions

• POST /v1/chat/completions - Create chat completion
• GET /v1/chat/models - List chat models

Models

• GET /v1/models - List all models
• GET /v1/models/{model_id} - Get model details

Reasoning Parameters

For o3-like models, you can control reasoning behavior using request parameters:

• reasoning_effort: Controls reasoning intensity ("low", "medium", "high")
• reasoning_summary: Controls summary format ("auto", "concise", "detailed", "none")
• reasoning_compat: Compatibility mode ("legacy", "o3", "think-tags", "current")

Important: These are request parameters controlled by users, not server configuration.

Chat Completion

curl -X POST "http://localhost:8000/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer your-token" \
  -d '{
    "model": "gpt-4",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ],
    "temperature": 0.7
  }'

Reasoning Models (o3-like)

curl -X POST "http://localhost:8000/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer your-token" \
  -d '{
    "model": "o3",
    "messages": [
      {"role": "user", "content": "Solve this complex math problem..."}
    ],
    "reasoning_effort": "high",
    "reasoning_summary": "detailed"
  }'

List Models

curl -X GET "http://localhost:8000/v1/models" \
  -H "Authorization: Bearer your-token"

Configuration

Environment Variables

You can configure the server using environment variables. Copy .env.example to .env and modify as needed:

cp .env.example .env

Available environment variables:

Server Configuration

• HOST: Server host (default: 0.0.0.0)
• PORT: Server port (default: 8000, Docker uses 11451)
• PYTHONPATH: Python path for imports (default: /app in Docker)

API Security

• KEY: API key for authentication (default: sk-test)
  • Important: Change this to a secure key in production!

Reasoning Configuration

• REASONING_EFFORT: AI reasoning effort level (default: medium)
  • Options: low, medium, high
• REASONING_SUMMARY: Enable reasoning summary in responses (default: true)
  • Options: true, false
• REASONING_COMPAT: Reasoning compatibility mode (default: think-tags)
  • Options: think-tags, openai-o1

Optional Configuration

• CHATGPT_LOCAL_HOME: Custom directory for ChatGPT local files
• CODEX_HOME: Custom directory for Codex files

Example .env file

# Server Configuration
HOST=0.0.0.0
PORT=8000

# API Security - CHANGE THIS IN PRODUCTION!
KEY=your-secure-api-key-here

# Reasoning Configuration
REASONING_EFFORT=medium
REASONING_SUMMARY=true
REASONING_COMPAT=think-tags

Authentication

The server uses the authentication information stored in auth.json. This file is created when you run get_token.py and contains your ChatGPT session information.

To refresh your authentication token:

uv run refresh_auth.py

Development

Project Structure

Codex2API/
├── codex2api/          # Main package
│   ├── __init__.py
│   ├── server.py       # FastAPI server
│   ├── models.py       # Data models
│   ├── request.py      # Request handling
│   └── utils.py        # Utility functions
├── main.py             # Entry point
├── start.sh            # Quick start script
├── docker-test.sh      # Docker testing script
├── get_token.py        # Authentication setup
├── refresh_auth.py     # Token refresh
├── auth.json           # Authentication data (created by get_token.py)
├── models.json         # Available models configuration
├── pyproject.toml      # Project configuration
├── .env.example        # Environment variables template
├── .dockerignore       # Docker ignore file
├── Dockerfile          # Docker image definition
├── docker-compose.yml  # Docker Compose configuration
└── README.md           # This file

Health Check

The server provides a health check endpoint at /health that returns the server status and timestamp.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Test your changes
5. Submit a pull request

Support

If you encounter any issues or have questions, please open an issue on the GitHub repository.