Sadly for him he committed his crimes in a country without the death penalty. So he gets everything the state can throw at him for the rest of his life. I still think that a regular life prisoner in a US prison would envy his treatment compared to theirs.
I suspect Breivik would have been allowed to meet more people, and increased interactions with other prisoners if he showed any kind of remorse or repentance for his crimes. But since he doesn’t, and uses these lawsuits to advance his cause, it’s no wonder that Norwegian authorities have chosen to limit his interactions to the absolute legal minimum because screw him.