o3 solves this correctly and produces a great table illustrating the solution to always keep the cabbage safe.

If you enter:

A farmer has a boat that can transfer up to 500 people or animals. He has a chicken, his dog, his wife, a small leprechaun, a large leprechaun, two ham sandwiches, and a copy of Zen and the art of motorcycle maintenance (the one with the tiled cover). How can he get them all across the river?

You will get a very detailed answer that goes on for several paragraphs that totally misses the point that there is no challenge here.