How hard is it to get into CS graduate program here?

I would really love love to study AI here but I havent been able to find much stats for the CS PhD program.

I am definitely not super genius cream of the crop I imagine caltech is full of so its pretty intimidating. I still have pretty good scores but not perfect. Am I screwened for example if I havent done any research in my field (I have done something else under SURF)?