Siri still works fine, I guess. I almost never use it (Android user) but got exasperated with Apple CarPlay's menus and asked it to play something in my wife's car.
Dunno about AI, it works quite a bit like the old Siri, although she's got an iPhone 16 with a current iOS. Worked just fine when I asked it to play some artist other than the annoying YT Music playlists.