Microsoft already supports local AI apps on Windows via Windows Copilot Runtime, which offers various AI features through Windows AI APIs and Windows machine learning ML. The models behind Windows Copilot Runtime on Copilot+ PCs run locally and continuously in the background. At Build 2025, Microsoft is introducing Windows AI Foundry, a unified platform for local AI development on Windows, by bringing together Windows Copilot Runtime and several new capabilities. Windows AI Foundry will offer
