Based on Naruto's feats from the manga, movies, and novel he has made vast improvements since the war. Base Naruto is easily High Kage level.
Spoilers warning
Kakashi novel feats:
- Naruto learn how to perform hand seals with one hand. This was before he received his new arm.
The Last feats:
- Base mode Naruto can create a FRS with one hand, throw it, and control it's trajectory.
- Naruto can create any rasengan with one hand.
- Created the Rasengan blast. That's the name I have given to the new Rasengan he used at the end of the movie. It shoots out like a blast of energy, similar to how the beast ball can be shot out in a wave form.
- Created a new 9 tails seal or altered the current 9 tails seal. Naruto released the 9 tails from his body and the 9 tails can use chakra mode. This shows improvement in sealing jutsu skills.
- Overall improvement in speed, strength, taijutsu and agility.
- Partial chakra mode. This shows huge improvement in chakra/9 tails chakra control/manipulation.
Gaiden feats:
- Body flicker jutsu mastery and incredible speed.
- wind claw
Bolt Movie feats:
- swordmanship mastery (during the Bolt movie Naruto proficiently used Sasuke's sword against Momoshiki)
- Super Rasengan. The rasengan used at the end of the movie. That rasengan is the strongest base rasengan ever. It was stronger that Momoshiki strongest attack. It launched Momoshiki into space before it exploded.