The Galaxy Note 5 now has root thanks to a pre rooted kernel from developer "Manh_IT". His method for root simply involves flashing a custom recovery to your device and then flashing his prerooted kernel via recovery. The only downside here is that this method will trip Knox which means that you won't be able to use security-relevant services like Samsung Pay. There may be a root method later on from Chainfire that does not trip knox, but for now this is the only way.
To root your device check enable OEM unlock in the developer settings. Next flash the kernel via Odin. Once the kernel is flashed simply install SuperSU from the Play Store. There is also a link for TWRP at the link below. This will not work on ATT or Verizon obviously.
via XDA