In my experience asking questions to Claude, the amount of incorrect information it gives is on a completely different scale in comparison to traditional sources. And the information often sounds completely plausible too. When using a text book, I would usually not Google every single piece of new information to verify it independently, but with Claude, doing that is absolutely necessary. At this point I only use Claude as a stepping stone to get ideas on what to Google because it is giving me false information so often. That is the only "effective" usage I have found for it, which is obviously much less useful than a good old-fashioned textbook or online course.

Admittedly I have less experience with ChatGPT, but those experiences were equally bad.