"The Alert Slider was created to reduce distractions. With your help, we have improved the Alert Slider on the OnePlus 6, giving you exactly what you need."
Leaked images and specs reveal a 3.5mm Jack and wood-inspired back panel design.
Xiaomi, which said there are already more than 100 "fast apps" in its app store, told Reuters the alliance is aimed at enhancing user experience and is not targeting any particular company.
This update brings with it numerous bug fixes and improvements to the UI, and warns users to uninstall the FactoryMode app.
OnePlus seems to be setting an example for other Android OEMs with its (relatively) timely Oreo updates.