In recent years, Microsoft has established a consistent pattern for naming updates to Windows 11, with versions like 22H2 and 23H2 following a predictable annual rhythm. However, the announcement of Windows 11 26H1 has stirred curiosity, as H1 releases previously held different implications during the Windows 10 era. Microsoft has clarified that 26H1 is a legitimate release, but it is not intended as a feature update for existing PCs. Instead, it will debut exclusively on new ARM devices set to launch in 2026, specifically those powered by the Snapdragon X2 series, and potentially the forthcoming NVIDIA N1X. Users currently operating Windows 11 on Intel or AMD hardware will not encounter 26H1 in their Windows Update notifications.
This release does not replace versions like 24H2 or 25H2, nor does it represent the next step in the upgrade path. Microsoft remains committed to its annual update strategy for existing PCs, with the next expected update, Windows 11 26H2, slated for later in 2026. Essentially, 26H1 resembles the specialized builds that original equipment manufacturers (OEMs) would preload for new hardware generations, now receiving an official version designation from Microsoft to support the latest silicon entering the market.
Windows 11 26H1 runs on a different core built for ARM silicon
The 26H1 release introduces a new internal base designed specifically for upcoming ARM chips, starting with Qualcomm’s Snapdragon X2 lineup, which is currently the only officially supported silicon. Microsoft refers to 26H1 as a “hardware-optimized release,” developed in collaboration with silicon vendors.
“26H1 is based on a different Windows core than versions 24H2, 25H2, and the upcoming feature update.” – Microsoft
The term “core” refers to the foundational platform codebase that enables Windows to function. This includes critical components such as the kernel, driver model, scheduler, hardware abstraction, and frameworks for power and security. Historically, these platform bases have been designated with codenames like Cobalt (21H2), Nickel (23H2), and Germanium (24H2 and 25H2). Reports suggest that the new 26H1 base may carry the codename Bromine.
Each platform release either replaces or significantly evolves this foundation, while enablement packages (eKB) like 23H2 or 25H2 unlock features already present in the same base system. The necessity for a different platform base in 26H1 arises from the distinct architectural requirements of the next-generation ARM processors, which utilize increasingly heterogeneous architectures. This evolution necessitates updates to scheduling logic, power management frameworks, and the overall balance between performance and battery life.
Hands-on with Windows 11 26H1
While 26H1 is not available for conventional PCs, it can be downloaded and tested in a virtual machine. However, users may find the experience largely mirrors that of 25H2, lacking the new features that have gradually rolled out to existing 25H2 installations. The innovations in 26H1 are primarily under the hood, and performance comparisons remain elusive without access to a Snapdragon X2-powered device.
Subtle changes in Windows 11 26H1
Upon booting into Windows 11 26H1, the OS Build number reflects a jump to 28020.1611, confirming the new “Bromine” platform and distinguishing it from the Germanium-based updates.
- Natural Language Search: A notable enhancement in 26H1 is the full integration of semantic, natural-language search within Settings. For instance, typing “my mouse pointer is too small” directly reveals the “Mouse pointer size” slider in the search results, allowing for immediate adjustments without navigating through menus.
- FAT32 Format Limit Increased: The long-standing limitation on FAT32 formatting has been addressed, raising the cap from 32 GB to a substantial 2 TB. This change simplifies the process of formatting large SD cards or drives as FAT32, eliminating the need for third-party tools.
- UI Refinements: Specific areas of the legacy UI have received polish, such as the updated buttons in the Storage Settings menu, which now align with the modern Windows 11 design language.
Additionally, Microsoft has made some notable omissions and safeguards:
- .NET Framework 3.5 Removal: The legacy .NET Framework 3.5 is no longer listed as an optional feature, as Microsoft encourages users to transition to more modern versions.
- Sysprep in Safe Mode: A new safeguard prevents the System Preparation Tool from running in Safe Mode, ensuring it is used only in its intended Normal or Audit modes.
Windows 11 26H1 is not a release that requires immediate attention unless one is acquiring a new device equipped with Snapdragon X2 silicon. Microsoft has positioned this version as a hardware-optimized iteration designed to leverage the capabilities of next-generation ARM platforms, while existing PCs will continue to receive regular updates and the upcoming Windows 11 26H2 feature update in 2026. For the majority of users and businesses, the current Windows 11 installation remains fully supported, receiving the same security fixes and lifecycle commitments as before.
