Actually it looks like it has a binary cutoff instead of human like uncertainty. When you ask a hard question it says that it's just a text model not able to answer.
I asked something along the lines of "Given the first box is red, and the second box is blue, what color is the 3rd box?"
The first reply was that there wasn't information to tell. I prompted "Assume there is a simple pattern" and it essentially spent two paragraphs explaining that there was no real way to tell... but also it'd probably be red.