Windows 10 build 21345
| Build of Cobalt | |
 | |
| OS family | Windows 11 (NT 10.0) |
|---|---|
| Version number | 10.0 |
| Build number | 21345 |
| Build lab | rs_prerelease |
| Compiled on | 2021-03-23 |
Windows 10 build 21345 is a build of Cobalt, the 21H2 development semester of Windows as a service. A screenshot of this build was posted to GitHub by a Microsoft employee on 1 April 2021.[1]