Jokes aside, why not include MIT or UChicago? The former is arguably a bigger Caltech, and the latter is extremely rigorous, even if not focused on engineering.
...How many schools do you think can fit in the #1 spot?
Additionally, if you want to learn something academic that isn't technology, I'm not sure MIT or Caltech would win (or even be applicable), hence UChicago as a possibility for a general "best at academics" university.
And by that measure, Caltech is significantly outperforming in "academics".
Very true. In fact, at colleges like Harvard and Columbia, higher grades are often easier to achieve than at the mid-tiers like Boston University and NYU.
With that said, there are colleges that force you to absorb copious amounts of information and fail you otherwise. UChicago is known for this. Is that not symbolic of being top in "academic excellence?".
What you're implying seems more like the "prestige" category, in which Harvard was mentioned as the winner above.
All of this aside the point, this doesn't explain how Caltech would be #1 in academic excellence for a college, above UChicago, and Caltech's larger equivalent, MIT.
In terms of academic excellence? Cal Tech.