Well, for what I know, modern chess engines are relatevly small AI models that usually work by taking on input the current state of the board and then predicting the next best move. Like Stockfish. Also, there is a game called Supreme Commander 2, where it is confirmed of usage small neural models to run NPC. And, as a person that somewhat included in game development, I can say that indie game engine libgdx provides an included AI module that can be fine tuned to a needed level for running NPC decisions. And it can be scaled in any way you want.
Well, for what I know, modern chess engines are relatevly small AI models that usually work by taking on input the current state of the board and then predicting the next best move. Like Stockfish. Also, there is a game called Supreme Commander 2, where it is confirmed of usage small neural models to run NPC. And, as a person that somewhat included in game development, I can say that indie game engine libgdx provides an included AI module that can be fine tuned to a needed level for running NPC decisions. And it can be scaled in any way you want.