"Windows 11 26H1" is a special version of Windows exclusively for new Arm PCs
Summary
Ars Technica explains that Windows 11 26H1 is a scoped release targeted at newly manufactured Arm-based PCs, starting with devices using Snapdragon X2 Elite. It will not be offered to existing Windows 11 PCs, which remain on 24H2 or 25H2, and 26H1 devices won’t automatically upgrade to the next major release. The article notes ongoing Arm-focused development and how this affects testing and deployment for IT environments.