https://wccftech.com/download-oneplus-8-and-8-pro-get-hydrogenos-11-developer-preview/

The HydrogenOS 11 went official only a few hours ago and OnePlus has already released the Developer Preview for both the OnePlus 8 and the 8 Pro. These builds are obviously based on the Android 11, and you can download them in this article.

For those who don't know, HydrogenOS 11 is basically the OS for OnePlus devices that are sold in China, and since both HydrogenOS and OxygenOS share the same codebase, users can cross-flash these packages on international or Chinese variants to see how the experience is going to be. However, if you do install HydrogenOS 11 on international variants, you will lose access to Google Play Services along with the pre-installed Google apps.