The OEM OnePlus has succeeded in releasing a build of Android 10 shortly after Google formally introduced this fresh version of the OS. It is an Open Beta compatible with the 7 series from the Chinese phone-maker. The ROM updates the UI and contains many long-awaited Android 10 features.
https://www.notebookcheck.net/OnePlus-releases-its-first-version-of-Android-10-for-the-7-and-7-Pro.434388.0.html