Copilot in VS Code Partially Open Source | Generated by AI
Question: Is Copilot in VS Code open source?
Answer: Partially. The frontend and client-side integration of GitHub Copilot in VS Code are open source, but the actual AI models and backend services remain closed source.
Microsoft and GitHub transitioned the extension’s codebase to an open-source model under the MIT license, migrating the code directly into the main open-source VS Code core repository.
Here is exactly what is open source versus what remains closed:
What is Open Source
- The UX and Client Extension: The client-side code responsible for the user interface, chat windows, inline edit interfaces, and prompt management in VS Code is completely open source.
- Prompt Engineering Logic: You can inspect the repository to see how your context is gathered, how prompts are structured before being sent to the AI, and what telemetry data is being collected.
What is Closed Source
- The AI Models: The actual underlying Large Language Models (LLMs) used by Copilot—such as those from OpenAI, Anthropic, and Google—are proprietary and closed source.
- The Backend Services: The cloud infrastructure and proprietary backend systems that process the AI requests and return data to your editor remain completely closed source.
- Subscription Model: Even though the client software is open source, using the official service still requires a GitHub Copilot account (though a limited “Copilot Free” tier is available).
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