https://wccftech.com/oneplus-7-and-oneplus-7-pro-get-the-android-q-beta/

OnePlus promised that their latest OnePlus 7 and OnePlus 7 Pro would be eligible for the latest Android Q beta shortly after launch. Both devices ship with Android Pie-based OxygenOS 9.5 out of the box. OxygenOS 9.5 is host to a lot of interesting features such as a better screen recorder, Nightscape 2.0 and Zen Mode.

The OnePlus 6 and 6T have already received their build of the Android Q beta and today, the OnePlus 7 and OnePlus 7 Pro are to receive it. As the build is still in beta, a lot of apps may not work as intended. OnePlus was also nice enough to list enough the known bugs with the build.