Gt is no longer a part of the story it's out now. There is no longer a Ssj4 which I'm glad lol, but now goku can go ssj god which originally he needed 5 people for but as a saiyan, his body adapted to the power and he can now go into on his own. He trains with whis the god of destruction ' assistant/trainer and him along with vegeta have a new super saiyan transformation called super saiyan god super saiyan which is stronger than ssj god