Barring the aged OnePlus 3 and 3T, all OnePlus devices are now running Android Pie. OnePlus has been steadily improving OxygenOS thanks to a regular stream of new Open Beta versions. Today, the OnePlus 5, 5T, 6 and 6T are at the receiving end of yet another wave of OxygenOS Betas. For OnePlus 5 and OnePlus 5T, OxygenOS Open Beta 24 and 26 respectively add a few fixes for the screenshot function, quick reply support when in Landscape Mode, and tweak the Gaming mode. You can download the beta using this link and following the instructions on the device page. Here's the full changelog:

SystemOptimizations for the screenshot functionSupport for quick reply in landscape mode, now easier to reply to new messages when watching videosGaming mode enhancement

For OnePlus 6/6T devices, the Open Beta 12 and four updates add a few more fixes and introduce OnePlus six users to the OnePlus Laboratory. Quick reply in landscape mode is also added for those using the 6 and 6T. It allows you to reply to messages from messaging apps such as the SMS app, WhatsApp, Telegram, etc. while watching a video or gaming and still see the message. The enhanced gaming mode and screenshot optimizations get a few tweaks too. You can download the beta using this link and following the instructions on the device page. Here's the full changelog:

SystemAdded OnePlus Laboratory for OnePlus 6Optimizations for screenshotsSupport for quick reply in landscape mode – now easier to reply to new messages when watching videosGaming mode enhancementClockNow supports world clock with weather information

Any device running the stable Android 9.0 Pie update can enrol to get experimental features and software tweaks that may or may not reach future full releases of OxygenOS via OnePlus Labs. OnePlus has also added support for weather information when using the world clock, which rounds off the entire Open Beta updates for all four devices.