To output "don't know" a system needs to "know" too. Random token generator can't know. It can guess better and better, maybe it can even guess 99.99% of time,

To output "don't know" a system needs to "know" too. Random token generator can't know. It can guess better and better, maybe it can even guess 99.99% of time, but it can't know, it can't decide or reason (not even o1 can "reason").