Microsoft's Mu is a cutting-edge 330 million parameter on-device small language model (SLM) that operates directly on the Neural Processing Unit (NPU) in Copilot+ PCs. This integration powers the new agent in Windows Settings, enabling rapid and efficient local AI tasks without relying on cloud processing. By leveraging the NPU's capabilities, Mu enhances the performance and responsiveness of AI features, providing a seamless and efficient user experience.