Last week, while everyone was paying attention to CES, OnePlus finally introduced the first Nougat-based update for the OnePlus 3 and 3T handsets, dubbed OxygenOS 4.0. Now, OxygenOS 4.0.1 is already available.
http://www.notebookcheck.net/OxygenOS-4-0-1-rolls-out.190735.0.html