I'm not sure if this was really "AI", or just some clever programming, but I recall reading that some designers set a computer loose on designing a new antenna.
As I recall, it did a lot of hit/miss type work, trying a maybe random design, and then testing it against some modeling software, and then iterating on the most successful results. It came up with something weird that no human ever designed. See if I can find a link....
Ahh, here is one:
en.wikipedia.org
View attachment 53210
They describe the process as modeling natural selection/evolution.