Went as high as 10 in the old one. Went above 5 in the new one too really.
With that said, and ironically so, despite being the purportedly lower power gameline overall, and though it took a near immediate swift, savage, stupid, pointless retcon through an edition change (that's right, the "new" world of darkness has a second edition now, called "Chronicles of Darkness"), archmages in the NWoD were insanely more powerful past a certain point. Just crazy more powerful.