Microsoft is ending its Claude Code licenses because it no longer wants to rent the intelligence inside its own products. Instead, it is pushing developers onto a homegrown coding model built for Copilot, a shift that signals where the company believes power in AI will actually accrue. In San Francisco this week, at its Build developer conference, Microsoft will show off that model — a coding system it build for one purpose: to sit at the center of GitHub Copilot. For two years Copilot was the default AI coding assistant, bundled into the platform most of the world’s developers already use. Then the market moved. In the nine months after Anthropic released Claude Code in May 2025, developers followed it, and in one major survey nearly half of respondents named it a favorite. The incumbent got overtaken. Here is the part worth slowing down on. Microsoft lost on model quality. Instead of putting the better model inside Copilot, Microsoft is building its own. That choice only makes sense if you believe the thing that decides this market is not the model. Microsoft is betting that distribution beats the best model, and the early enterprise data says the bet is reasonable.