OxygenOS 5.0 is now available for the OnePlus 3T.
It contains the latest and greatest in terms of android versions: Android 8.0 "Oreo". It also has some other cool new features, such as a new Quick Settings design, and offers updated security patches for your device.
A really cool feature worth mentioning is "Parallell Apps". Parallell apps allows you to have multiple instances of the same app. This is handy for social (network) apps, such as WhatsApp and Facebook. You can now have both your work and personal account on one phone.
Note for users with a rooted device / custom recovery:
Please note, that automatic update installation using Oxygen Updater might fail, as TWRP recovery currently has some issues on Android 8.0 "Oreo". Be prepared to install the update manually or using the stock recovery mode.
Icon: Android Planet, Image: OnePlus