The Forza racing series, from Microsoft, uses AI opponents called Drivatars that are trained on how real people actually drive. Developed by Microsoft’s research studio in Cambridge, UK, the system “sought a way to use machine learning to emulate real player behavior in computer-controlled opponents,” as Microsoft explained in a 2014 Xbox Wire post about Forza Horizon 2.
A player’s Drivatar learns their habits - where they brake, how sharply they corner, how aggressive they are - and then, per that post, “moved to the cloud, ready to be called upon to race other players.” The result is a field of opponents with distinct, human-like styles rather than identical rubber-banding bots: some “brake earlier, some later,” some “corner more sharply.” Having shipped since the first Forza Motorsport in 2005, Drivatars are among the longest-running uses of machine learning in commercial games.