https://www.techradar.com/news/android-9-pie-is-now-rolling-out-to-the-oneplus-6

We're still waiting for the OnePlus 6T, but in the meantime the OnePlus 6 has just got a little bit better, as the company has announced that Android 9 Pie is now rolling out to the handset.

The update brings a new interface, Android Pie's gesture navigation, and adaptive battery life, which uses on-device machine learning to predict which apps you're likely to use and leave them open in memory, while closing those that you're unlikely to use for a while, thereby extending life.