Four weeks ago, Oreo landed on the OnePlus 3 beta channel. Soon, its successor - the OnePlus 5 - will join it, judging by results found on GeekBench. This is not official mind you, the beta channel for the 5 still distributes Android 7.1.1 Nougat. And even once it hits the beta channel, the final release will be some way off. There's time for OnePlus to launch the Oreo update around New Year's like it did last time. OnePlus was pretty quick with the Nougat update for the 3 - the beta arrived at the end of November, the rollout was on January 1. That said, 3's Oreo is still in beta...
Source: http://www.gsmarena.com/oneplus_5_running_oreo_found_in_geekbench_database-news-27502.php
