I believe there is no system for this either. They are just manually putting the homework pdf you submit into the chatbot and going “grade this paper” one by one; and with no homework context given to the chatbots beforehand.

The reason I say this is that grades still come out a week later, and also if I see a problem is too tedious I am able to just erase the question and submit that pdf with no point loss.

I even had a classmate get 100% on their homework by submitting a blank paper once this semester.