🤖 Qwen Code OAuth Plugin for OpenCode

Authenticate OpenCode CLI with your qwen.ai account. This plugin enables you to use Qwen3-Coder models with 2,000 free requests per day - no API key or credit card required!

🇧🇷 Leia em Português

✨ Features

• 🔐 OAuth Device Flow - Secure browser-based authentication (RFC 8628)
• ⚡ Automatic Polling - No need to press Enter after authorizing
• 🆓 2,000 req/day free - Generous free tier with no credit card
• 🧠 1M context window - Models with 1 million token context
• 🔄 Auto-refresh - Tokens renewed automatically before expiration
• 🔗 qwen-code compatible - Reuses credentials from ~/.qwen/oauth_creds.json

📋 Prerequisites

• OpenCode CLI installed
• A qwen.ai account (free to create)

🚀 Installation

1. Install the plugin

cd ~/.opencode && npm install opencode-qwencode-auth

2. Enable the plugin

Edit ~/.opencode/opencode.jsonc:

{
  "plugin": ["opencode-qwencode-auth"]
}

🔑 Usage

1. Login

opencode auth login

2. Select Provider

Choose "Other" and type qwen-code

3. Authenticate

Select "Qwen Code (qwen.ai OAuth)"

• A browser window will open for you to authorize
• The plugin automatically detects when you complete authorization
• No need to copy/paste codes or press Enter!

Tip

In the OpenCode TUI (graphical interface), the Qwen Code provider appears automatically in the provider list.

🎯 Available Models

Model	Context	Max Output	Best For
qwen3-coder-plus	1M tokens	64K tokens	Complex coding tasks
qwen3-coder-flash	1M tokens	64K tokens	Fast responses

Using a specific model

opencode --provider qwen-code --model qwen3-coder-plus

⚙️ How It Works

┌─────────────────┐     ┌──────────────────┐     ┌─────────────────┐
│   OpenCode CLI  │────▶│  qwen.ai OAuth   │────▶│  Qwen3-Coder    │
│                 │◀────│  (Device Flow)   │◀────│  API            │
└─────────────────┘     └──────────────────┘     └─────────────────┘

1. Device Flow (RFC 8628): Opens your browser to chat.qwen.ai for authentication
2. Automatic Polling: Detects authorization completion automatically
3. Token Storage: Saves credentials to ~/.qwen/oauth_creds.json
4. Auto-refresh: Renews tokens 30 seconds before expiration

📊 Usage Limits

Plan	Rate Limit	Daily Limit
Free (OAuth)	60 req/min	2,000 req/day

Note

Limits reset at midnight UTC. For higher limits, consider using an API key from DashScope.

🔧 Troubleshooting

Token expired

The plugin automatically renews tokens. If issues persist:

# Remove old credentials
rm ~/.qwen/oauth_creds.json

# Re-authenticate
opencode auth login

Provider not showing in auth login

The qwen-code provider is added via plugin. In the opencode auth login command:

1. Select "Other"
2. Type qwen-code

Rate limit exceeded (429 errors)

• Wait until midnight UTC for quota reset
• Try using qwen3-coder-flash for faster, lighter requests
• Consider DashScope API for higher limits

🛠️ Development

# Clone the repository
git clone https://github.com/gustavodiasdev/opencode-qwencode-auth.git
cd opencode-qwencode-auth

# Install dependencies
bun install

# Type check
bun run typecheck

Local testing

Edit ~/.opencode/package.json:

{
  "dependencies": {
    "opencode-qwencode-auth": "file:///absolute/path/to/opencode-qwencode-auth"
  }
}

Then reinstall:

cd ~/.opencode && npm install

📁 Project Structure

src/
├── constants.ts        # OAuth endpoints, models config
├── types.ts            # TypeScript interfaces
├── index.ts            # Main plugin entry point
├── qwen/
│   └── oauth.ts        # OAuth Device Flow + PKCE
└── plugin/
    ├── auth.ts         # Credentials management
    └── utils.ts        # Helper utilities

🔗 Related Projects

• qwen-code - Official Qwen coding CLI
• OpenCode - AI-powered CLI for development
• opencode-gemini-auth - Similar plugin for Google Gemini

📄 License

MIT

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Made with ❤️ for the OpenCode community