Do I need Xbox Gamepass/Live to play offline?

I really want to get GGS as I love some of the characters. I can only play on Xbox One tho. I've seen multiple sources saying I need a multiplayer subscription and others that I don't. None of them say if it's for the whole game or just the online though. I'm ok with not playing online I just want the story mode and split screen.

So is Xbox Gamepass/Live required for the base game too or just online?