The Nexus 6P and 5X are compatible with major carriers in the U.S -- full radio band listings.

[VW Maverick]

The Nexus 6P and 5X are compatible with major carriers in the U.S. — here are the full radio band listings | Android Central

Mav.

 

[Zendroid1]

Looks like no band 30 on 5x is the only difference. This may upset a few AT&T folks.