OnePlus 5T and OnePlus 5 owners can now get Android 8.1 on their phones, so long as they're willing to live with beta software.
OnePlus has released beta updates for both the OnePlus 5T and OnePlus 5 that include Android 8.1. The OP5T has received Open Beta 4, while the OP5 is on Open Beta 6.
In addition to the bump to Android 8.1, both phones are getting features like a new gesture that'll let you answer incoming phone calls by raising your phone, more clock styles for the ambient display, and the February 2018 Android security patches.
Here's the changelog for the OnePlus 5T's Open Beta 4 update:
Updated system to Android™ 8.1 Oreo™
Phone
System
Gaming mode
OnePlus Switch
And the changelog for the OnePlus 5's Open Beta 6 update:
Updated system to Android™ 8.1 Oreo™
Phone
System
Gaming mode
OnePlus Switch
If you want to give OnePlus's Android 8.1 beta a try, you can install your phone's beta update right now. Just keep in mind that the software may be a bit buggy.
OnePlus hasn't said when its full Android 8.1 updates for the OnePlus 5T and OnePlus 5 will happen.