we don't spit outputs based solely on inputs.

I mean, that depends on what you define as an input, but unless you believe in some magic juice that makes us special (like a soul), then yeah, we are just responding based on inputs.

Now, that doesn't mean AIs work like our brains, responding based on inputs is pretty much applicable to everything, that's simply what determinism is, action leads to reaction. It's the process in between taking an input and giving an output that matters.