The differences are the Hero 5, without a housing is waterproof to 33 ft, deeper requires a dive housing. Hero 5 has video stablization, however it is limited and does not work with any 4K video or 1080P over 60fps video. Has GPS where you are supposed to be able to geo tag your video and photos. Voice recognition, accepts voice commands for taking videos, photos, and turning off the camera. Comes with a simplified touch display which gives easy access to the camera's settings, touch display is an accessory for the GP4 Black. Draw back on the GP5 is it will not accept a battery back pack, which is an accessory for the GP4. When it comes to video and photo capture the specs are the same.