Copilot API is a server that exposes GitHub Copilot as an OpenAI and Anthropic API-compatible endpoint.
The tool solves the problem of using GitHub Copilot with applications and workflows designed for OpenAI or Anthropic APIs. It works by running a local server that accepts requests in the standard OpenAI and Anthropic API formats, translating them to communicate with GitHub Copilot, and returning responses in the expected format. This allows developers to leverage their existing Copilot subscription with any tool or application that supports these standard API interfaces, including Claude Code.
The project suits developers who already have GitHub Copilot access and want to use it with tools that expect OpenAI or Anthropic-compatible APIs. It is particularly useful for those building applications or integrations that standardize on these API formats but prefer to route requests through Copilot rather than directly to OpenAI or Anthropic services. The approach of reverse-engineering Copilot's communication protocol means users maintain their existing Copilot subscription without needing separate API keys for OpenAI or Anthropic.
The project shows active development with recent commits and ongoing refinement of the API compatibility layer. The codebase is written in TypeScript, indicating a focus on type safety and maintainability for a tool that must precisely match external API specifications. The inclusion of a homepage with usage documentation suggests the maintainers are invested in making the tool accessible to users beyond those reading the source code directly.
