Key Points
- New Release Preview builds for Windows 11 (26126.1000) and Windows 10 (19045.4000) are now available.
- These builds arrive ahead of the 26H1 release scheduled for May 14, 2026.
- Targeted at Windows Insiders for testing before wider availability.
What is changing
Microsoft released new Release Preview builds for both Windows 11 and Windows 10 on May 14, 2026. The specific build numbers are 26126.1000 for Windows 11 and 19045.4000 for Windows 10.
Windows 11 version 26H1 is a targeted release designed for specific device hardware and silicon types, as detailed in their IT Pro blog.
Why it matters
This matters most to Windows Insiders participating in the Release Preview channel. They get early access to test features and provide feedback before the final public release.
The impact is currently **limited** to testers, as these builds are for preview and feedback, not general deployment. Insiders may notice new features or fixes, but these builds can still contain bugs.
Have you tried the new build? Share your experience or test results in the comments.