In September 2025, Microsoft introduced an automatic AI model - selection feature into the Visual Studio Code editor. This feature is designed to automatically pick AI models based on the principle of "optimal performance." For GitHub Copilot users on the free plan, they have the flexibility to switch among various models, including Claude Sonnet 4, GPT - 5, GPT - 5 mini, and others. On the other hand, paid users of GitHub Copilot mainly depend on the Claude Sonnet 4 model. The head of Microsoft's developer division mentioned that according to the company's internal benchmark tests, Claude Sonnet 4 has emerged as the recommended model for GitHub Copilot. This decision is rooted in the model's ability to deliver top - notch performance in a range of coding scenarios, aligning with Microsoft's commitment to providing developers with the most efficient and reliable tools.