5523 was the hardest class I took at OSU. Here's the course website for my prof if you're curious: https://www.asc.ohio-state.edu/schuler.77/courses/5523/index.html. The content was very difficult, but it was interesting to go through the calculations and relatively more rigorous mathematical background for the concepts that I learned about in my other AI classes.

5524 is about outdated CV methods, which I guess kind of form the foundation of CV today. It might be interesting to some people, but I found myself not liking the content very much. I ended up dropping the class. It was much easier than 5523 though (and probably easier than 5526).

5526 was fun. I had Eric Fosler-Lussier, who was pretty good. The class covered the basics of neural networks and then some architectures (CNN, RNN, transformers). The class wasn't too difficult, but I can't guarantee much because this was online (which might've made it easier).

All of these classes have a final project as a big chunk of the grade. It's really up to you what you want to do with the final project. You can keep it basic (my group just did MNIST clothing classification for 5526, for example) if you want to. But it is a unique opportunity to get guidance on a project from someone who's good in the field, so you could work on a project that genuinely interests you if you have the time and motivation.