Microsoft Build 2026: GitHub Copilot Drops GPT-4 for In-House Project Polaris

Starting August 2026, GitHub Copilot's default engine switches from GPT-4 Turbo to Project Polaris, Microsoft's own in-house coding model. This ends Copilot's dependence on OpenAI and gives Microsoft full control over the model roadmap. Separately, the Agent Framework for .NET and Python hit production-ready 1.0 and is now Microsoft's official standard for multi-agent systems on Azure.

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Sources: TechTimes · Engadget Build 2026 Live Blog