Answer from Claude 4 Sonnet just now (I copy-pasted your prompt):

> This is a variation of the classic river-crossing puzzle, but with an added complexity - the lion that will eat both the wolf and the goat. Let me work through this step by step: The constraints:

> Goat + Cabbage alone = Goat eats cabbage > Wolf + Goat alone = Wolf eats goat > Lion + Wolf alone = Lion eats wolf > Lion + Goat alone = Lion eats goat

> The solution:

> First trip: Man takes the goat across Left behind: Cabbage, Wolf, Lion (safe - wolf won't eat cabbage, lion won't eat wolf if goat isn't there)

> Second trip: Man returns alone, then takes the wolf across Brings the goat back to prevent wolf from eating it Left behind: Cabbage, Goat, Lion

> Third trip: Man takes the lion across, leaves it with the wolf Left behind: Cabbage, Goat (safe - goat won't eat cabbage if separated properly)

> Fourth trip: Man returns alone, takes the cabbage across Left behind: Goat (alone and safe)

> Fifth trip: Man returns alone, takes the goat across Wait, let me reconsider this more carefully. Actually, there's a fundamental problem: if the lion will eat either the wolf OR the goat when left alone with them, and we need to get all items across, we can never safely leave the lion with either animal.

> The puzzle as stated appears to have no solution, because the lion creates an impossible constraint - it cannot be left alone with either the wolf or the goat on either side of the river, making it impossible to transport all items safely.

It got it right, eventually which is impressive. However, it's ability to retain proper context is still a problem (it took the goat on the first trip, then thinks the goat is still on the same side of the river as the other things.