Earlier today a well-known community tester of USB devices reported that the 5″ version of Google’s Pixel phones was not able to pull more than 15 watts of power off the stock 18W USB-PD charger, despite Google’s specification site for the Pixels implying heavily that both devices were capable of 18W charging.
Charging
USB Type-C™ 18W adaptor with USB-PD
18W charging
We reached out to Google, and it turns out this was just a marketing materials mistake: the official specification page for the Pixel has been updated to correctly state that the phones support USB-PD charging from 15-18 watts, as opposed to simply 18 watts.
Google clarifies Pixel charging speeds, 5" Pixel peaks at 15 watts, only XL can do 18W was written by the awesome team at Android Police.