Microsoft Tests New Windows 11 Builds in Dev Channel

28 Jan 2026

Microsoft has initiated testing of Windows 11 26300 series builds, aiming to enhance platform stability. The new builds are available in the Insider Dev Channel.

Platform Changes in Dev Channel

The 26300 builds will bring behind-the-scenes platform updates. These builds share features with the 26220 series in the Beta Channel but differ in underlying platform work.

  • 26300 series builds started rolling out in Dev Channel on 2026-01-27.
  • These builds aim to improve Windows 11 platform stability and rollout.
  • Germanium serves as the basis for the current in-market platform releases.

Advanced Features and Impact

Microsoft's recent updates point to improvements in platform robustness. While specifics are yet to be disclosed, the 26300 series may address previous rollout issues. Upcoming releases include new ARM devices on Bromine platform, highlighting Microsoft’s focus on hardware integration.

Participants in the Insider Program can access the Dev Channel and update their systems to test these advancements. The Dev and Beta channels maintain similar known issues and features for consistency.

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