In a Twitter response Josh Holmes, Studio Head for Halo 5: Guardians, confirmed that Halo 5 will not feature split-screen for co-op campaign or multiplayer (Arena or Warzone).
This comes after the news from Game Informer earlier this month that Halo 5’s campaign would not support split-screen (local) co-op. This was due to the goal of ensuring top framerate and graphical performance at all times.
Frank O’Connor went on to explain further on NeoGaf around the same time, “that 60 fps had to take precedence. It’s not just aesthetics – the entire simulation is built on that frame rate.”