Feature Request: BYOK (Bring Your Own Key) Support for Custom AI Models like xAI

[ArkaBattiato25]

Problem Statement

GitHub Copilot CLI currently only supports models provided through GitHub Copilot subscription. Users who have access to other AI models (like xAI's Grok) through their own API keys cannot use them.

Proposed Solution

Add BYOK support to allow users to configure custom AI model providers.

Use Cases

• Cost optimization with personal API keys
• Access to specialized models (xAI Grok, etc.)
• Enterprise flexibility
• Regional compliance

Implementation Ideas

1. Extend /model command to add custom providers
2. Config file like mcp-config.json for model providers
3. Environment variable support for API keys