Also couldn't get o1 to fail. I tried the following with o1:
"Which is heavier, a solid titanium box weighing 9.9 flubs, or an empty wooden box weighing 10.1 blobs, where 1 flub = 1 kg, and 1 blob is 1kg".
The answer:
"Since 1 flub = 1 kg and 1 blob = 1 kg, the titanium box’s mass is 9.9 kg and the wooden box’s mass is 10.1 kg. Therefore, the wooden box (10.1 kg) is heavier."
"Which is heavier, a solid titanium box weighing 9.9 flubs, or an empty wooden box weighing 10.1 blobs, where 1 flub = 1 kg, and 1 blob is 1kg".
The answer: "Since 1 flub = 1 kg and 1 blob = 1 kg, the titanium box’s mass is 9.9 kg and the wooden box’s mass is 10.1 kg. Therefore, the wooden box (10.1 kg) is heavier."
Thought that was pretty impressive.