MIT is absolutely harder and more rigorous than UPenn (and, for that matter, HYP). If you compare the GPAs of people from those schools and e.g. MCAT scores, MI

MIT is absolutely harder and more rigorous than UPenn (and, for that matter, HYP). If you compare the GPAs of people from those schools and e.g. MCAT scores, MIT students exhibit a much stronger positive correlation. This is pretty common knowledge, in the same way people know that Berkeley and CalTech have tougher classes than Stanford.