How to Use Any OAI-Compatible API with GitHub Copilot — Custom Model Setup Guide

GitHub Copilot now allows users to connect Chat and the CLI to any OpenAI-compatible API endpoint, enabling the use of custom models like Claude Opus or local vLLMs. This 'Bring Your Own Key' functionality supports VS Code Chat/Agent mode and the Copilot CLI, billing users directly via their chosen provider rather than GitHub's quota.