the leveling system goes as follows
Basic Levels
1-112
Master Levels (After 112)
Master 1 - 33
God Levels (After Master 33)
God 1 - 12
Rebirth Stages (After God 12)
Rebirth 1 - 12
Now as it does not cost the player to level up all the way to god 12 when you hit rebirth stages it will cost the player 10,000 contribution points per rebirth stage.
So the Highest level as of now is Rebirth 12
Hope This Helps ^^