Google has just released the Factory Firmware Images, OTA Files and Driver Binaries for the Pixel and Pixel XL.
The Firmware Images will help Pixel users to put the Smartphone back to Original Software condition while the you can flash the OTA for doing a manual software update to latest version, without wiping the whole data.
For now there are three Factory Images namely- NDE63H, NDE63L, NDE63P. Note- The Images are different for different carriers and country.
Download:- Factory images | OTA files | Drivers