The beta testing is over - the OnePlus 6 is getting a stable Android 9.0 Pie release. It comes in the form of OxygenOS 9.0 and it brings several improvements (note that the previous OxygenOS version was 5.x). For starters, OnePlus adopted the Android Pie user interface and gestures, support for custom accent colors has been added as well. The new Adaptive Battery feature will learn when you use each app and prevent it from draining your battery when you're unlikely to need it. Some luck users are already downloading Android Pie on their OnePlus 6 Do Not Disturb now supports...
Source: https://www.gsmarena.com/oneplus_6_getting_stable_android_90_pie-news-33396.php