After beta version of Android Pie in One plus 3 and One plus 3T, flagship Oneplus6 and Oneplus 6T is rolling out Oxygen OS.
The stable version of OS is OxygenOS 9.0.13 for the OnePlus 6T and OxygenOS 9.0.5 for the OnePlus 6, though they do not offer a lot of features they are stable as it comes with the March 2019 security patches. While the company is not ready to roll out the April security patch. The new feedback tool has Community app and fixes the miscellaneous bugs and provide stability.
It is recommended to download the new update for stability and security. The update is now rolling out in waves, and it will reach a broader range of users within the following days. If you don’t want to wait you can download the update through Oxygen updater to download it.