Im really not sure, I tried a game against AI just to check it out. I noticed Oak would would stand and let a tower kill him at full life, none of the other AI that I noticed did that.
But I did see improvement with AI runnin when they couldn't win a battle instead of just standing there getting pounded. But alas Rook is still the worst AI demi-god out of all of them, he always goes in to suicide on towers, or go into battles against other demigods with absolutely no chance of winning. There is huge room for improvement but for the most part the AI does run at times when they need too.
Good thing this game is more important for multiplayer but I'd like to see the AI get improved much more.