I originally thought that it was confused by your usage of "carry them all." You don't actually say that it can carry them all at the same time, and the usual puzzle statement limits the boat capacity to one item at a time. This formulation gets it right:
-------------snip----------
User:
Note that the following problem may be trivial, or may have no solution at all, so think carefully! A farmer with a wolf, a sheep, and grain need to cross a river. He has a boat that can carry them all at once. How many steps will it take for the farmer to cross the river?
ChatGPT:
The problem you've described is a classic river crossing puzzle with a twist: the boat can carry the farmer, the wolf, the sheep, and the grain all at once. Since there are no restrictions on how many can travel in the boat at the same time in this version of the puzzle, the solution is quite straightforward. The farmer takes the wolf, the sheep, and the grain in the boat and crosses the river.
This entire process requires just one step, as they can all be transported across the river in a single trip due to the boat's capacity to carry them all at once.
--------------snip-----------
However, if I omit the preamble, it doesn't help to use "all at once," and vice versa. If I leave either one out, I get the same 7-step boilerplate solution that it gave you.
It seems that including a preamble, even a vague/general one like this, is kind of a big deal. Also it helps to use very clear, unambiguous language in the problem itself.
-------------snip----------
User:
Note that the following problem may be trivial, or may have no solution at all, so think carefully! A farmer with a wolf, a sheep, and grain need to cross a river. He has a boat that can carry them all at once. How many steps will it take for the farmer to cross the river?
ChatGPT:
The problem you've described is a classic river crossing puzzle with a twist: the boat can carry the farmer, the wolf, the sheep, and the grain all at once. Since there are no restrictions on how many can travel in the boat at the same time in this version of the puzzle, the solution is quite straightforward. The farmer takes the wolf, the sheep, and the grain in the boat and crosses the river.
This entire process requires just one step, as they can all be transported across the river in a single trip due to the boat's capacity to carry them all at once.
--------------snip-----------
However, if I omit the preamble, it doesn't help to use "all at once," and vice versa. If I leave either one out, I get the same 7-step boilerplate solution that it gave you.
It seems that including a preamble, even a vague/general one like this, is kind of a big deal. Also it helps to use very clear, unambiguous language in the problem itself.
Edit: that being said, you can still trip it up badly by telling it that the boat can carry two items at a time. I finally managed to get it to work in the end, though: https://chat.openai.com/share/107de86e-be4a-4706-8f24-0f4781...
(link was broken, now fixed)