It’s very tinted. No worries about the sun. I suppose there must still be at least some greenhouse effect but from living in the Northeast, I’ve never noticed any heat from the sun through the roof.

Compared to my Subaru’s sun roof, which has dark tinting but lets in a lot of heat, the Tesla glass roof tinting is much darker and doesn’t

It may also help the perception of heat that I usually have cabin overheat protection turned on. After my car has been parked out in the hot sun, even if I forget to turn on climate control ahead of time, the cabin is never over 100° when I get in, and cools quickly