One of the best features of a OnePlus device is incredible amount of Root and Rom support. The devices are open and are extremely developer friendly. The OnePlus 3 released with Oxygen OS, but even before the device started shipping there were already beta builds of CyanogenMod 13 available for the phone.
Nighties have officially been released for the OnePlus 3. Of course you will need to be rooted with custom recovery installed. Head to the link below to grab the nightly build for flashing!
via get.cm