Hallucinations come up when asking knowledge bases questions, such as "In React’s Canary Fragment refs API, which FragmentInstance method returns a flat array of DOMRect objects for all children?" Or "Over what years did Roubini and Sachs examine 15 OECD countries when assessing trends in tax-to-GDP ratios?" While to me those may seem hyper-specific and unlikely to come up in a real context, students will absolutely ask questions similar to these.

Are you suggesting that it's higher or lower?

IME on real projects you do need to be very careful with prompts about topics that are less likely be common in the training set.