GitHub Copilot eyes in-house coding model

Microsoft is trying to regain control of the AI coding narrative, and the bigger signal is strategic: Copilot can’t stay dependent on rivals forever if Microsoft wants margin, speed, and product differentiation. GitHub Copilot has been squeezed by tools like Cursor and Claude Code, which have set the pace for agentic coding workflows. An in-house model could reduce Microsoft’s reliance on OpenAI and Anthropic while giving it tighter product integration. Investors are treating AI ownership as a valuation lever, which helps explain the stock reaction. The key question is whether this becomes a genuinely better coding experience or just a cheaper internal substitute. If Microsoft shows real gains at Build, the pressure shifts to whether Copilot can compete on depth, not just distribution.