If you tell it to implement something it will go ahead and implement it, without considering how much complexity it adds to the system or weighing alternatives.

Recently I asked Claude (Fable) to use multiple threads to speed up a computation that could take several seconds to run while the user was waiting. Instead, it found a way to start the computation earlier in the background while the user was doing other things, so that it would be finished by the time the user was ready.

Yes, at the tactical level, AI is able to find better alternatives.