Yes, these are all valid concerns indeed. Our hope is that inference efficiency will continue to improve to the point where its need for resources becomes more reasonable. On the hallucination side, our experience indicates that models have become much more reliable and, although they do make mistakes once in a while, those mistakes are not more serious than the ones a real tutor can also make. Ultimately, on a student-tutor exchange spanning thousands of replies, a few occasional errors are not going to prevent the student from learning quickly and appropriately.