The book called it a "narrow AI"; it was based on AI(s) from his games, just treating Earth as the game world, and recruiting humans for physical and mental work, with loyalty and honesty enforced by fMRI scans.
For another great fictional portrayal of AI, see Person of Interest[1]; it starts as a crime procedural with an AI-flavored twist, and ended up being considered by many critics the best sci-fi show on broadcast TV.
[0] https://en.wikipedia.org/wiki/Daemon_(novel)
[1] https://en.wikipedia.org/wiki/Person_of_Interest_(TV_series)