Microsoft is rolling out new Windows 11 Insider Preview builds for version 26H1, landing on the Beta and Experimental channels today, 31 August 2026. The announcement came straight from the Windows Insider Program team, with two distinct builds aimed at testers looking to poke around the upcoming feature update.
What’s in today’s release
Two builds shipped today, one for each channel:
- Beta Channel: Build 28020.2818
- Experimental Channel: Build 28120.2824
Both builds belong to Windows 11, version 26H1, the next major feature update Microsoft is developing for Windows Insiders. The Beta and Experimental channels sit higher up the testing ladder than the Canary Channel, meaning these builds are generally more stable than daily Canary flights but still far from the general public.
For the exact list of changes, fixes, and known issues bundled into each flight, Microsoft points testers to the official release notes for each channel. Those notes spell out what was added or repaired in today’s build, along with any remaining bugs you might run into. Today’s announcement itself is a routine weekly flight rather than a milestone release, so the real substance lives in those linked release notes.
Understanding the Beta and Experimental channels
If you’re not deep in the Insider Program, the channel names can be a bit confusing. Here’s how they fit into the broader testing structure.
The Experimental Channel is designed for testers who want to try the latest features as early as possible, but with a bit more stability than the Canary Channel. Builds here roll out to a larger share of testers and tend to include features that are still being refined. It’s the channel for people who want to see where Microsoft is heading without living on the absolute bleeding edge.
The Beta Channel is aimed at testers who want a slightly more polished experience. Builds here are expected to be relatively stable, and Microsoft typically uses this channel to gather feedback before features move toward release. If a build on the Beta Channel starts showing widespread problems, that’s usually a sign that something isn’t ready for the broader public yet.
Both channels are part of the Open Channel, the testing track most everyday users should consider if they want to try new features ahead of the general public while keeping their system reasonably reliable. This is distinct from the Dev Channel, which is the most volatile track and best suited for enthusiasts who don’t mind frequent breakage.
Windows 11 version 26H1 in context
Version 26H1 is one of Microsoft’s annual feature updates. Following Microsoft’s typical cadence, major feature updates ship in the first half of the year, with the “26H1” naming indicating the update is targeted for broader availability in 2026. Insiders on the Beta and Experimental channels are effectively the first wave of testers working through this update before it reaches the wider public.
Because 26H1 is still in active development, today’s builds are part of an ongoing testing cycle. Microsoft uses feedback from Insiders on these channels to catch bugs, refine features, and tune performance before the update ships to everyone. That’s why each weekly flight tends to include a mix of new work, fixes, and occasional regressions.
What This Means for You
For most Windows users, nothing changes immediately. The general public won’t see version 26H1 until Microsoft pushes it out through normal update channels, which typically happens months after Insiders start testing it. If you’re on the stable release of Windows 11, you have no reason to jump on these builds.
However, if you’re an Insider enrolled in the Beta or Experimental channels, today’s update is simply the next step in the testing cycle. You should review the release notes before installing, particularly the “known issues” section, so you know what to expect and what might break on your machine.
How to Get It
To receive today’s build, you’ll need to be enrolled in the Windows Insider Program and set to the Beta or Experimental channel. Here’s the general path:
- Open Settings and head to Windows Insider Program.
- Make sure you’re enrolled and switched to the Beta or Experimental channel.
- Go to Windows Update and check for updates. Your PC should download and install the appropriate build for your channel.
If the new build doesn’t show up right away, don’t worry — rollout is gradual, and it can take a day or two for the update to reach every tester. A quick check a few days later usually does the trick.
Once installed, you can verify your build by going to Settings > System > About and checking the version and build number against 28020.2818 (Beta) or 28120.2824 (Experimental).
Source: Windows Blog
Over to you: Are you testing the 26H1 builds on the Beta or Experimental channel, or keeping your system on the stable release?
