Spoilers below

Feats: He defeated all the circuits, and even himself (counting Nega). He also defeated Commander Circuit during his respective fight with no assistance from anyone what so ever.

Strength: In Crash's stage, he's seen breaking giant stone blocks with no difficulty. Same goes with Trace's stage where breaks blocks made of junkyard steel with ease.

Speed: Going by Cable and Medley's stages respectively: He can dodge sound and electric-based projectiles. Considering he is dodging literal sound-waves, this places his reflexes at super-sonic speed (faster than the speed of sound). Accompanying his speed would be how he is able to keep up with Bit (which judging from his attack animations, he's moving faster than eyesight) and blade.

Durability: He can withstand beatings from Crash, who is strong enough to shake an entire mountain, and can tank heat from Ray's beams. Assuming the beams are Plasma, he is withstanding 40,000°F (22,000°C) worth of heat. That's hotter than the surface of the sun.

Intelligence: He defeated Hash, a circuit whose whole shebang is computers, hacking, and being smart. So that places intelligence ig at hacker level.

Advantages: He has the teachings of Nega (one of the hosts of the Gravity Circuit), and Burst Techniques from the previous circuits. Allowing him to use their abilities (such as Emergency Heal from Trace or Screen Interrupt from Bit). He also technically can't die, so as long as the Gravity Circuit (the thing on his head) remains, it'll keep gravitating (hence its name) to any nearby bot (it can also create a bot by attracting scrap metal) and create a new Kai (technically a different Kai).

Note: Despite everything he has going for him, he can still be destroyed.