At MWC 2017, Google announced the Google Assistant for all Android devices running Android 6.0 Marshmallow and Android Nougat with Google Play Services.
Today, OnePlus on their Twitter handle officially announced that the Google assistant is now rolling out for the OnePlus 3 and 3T, while there's no information on when the Google's AI will be available for the OnePlus Two, OnePlus One and OnePlus X which still runs Android Marshmallow.
Google Assistant, the personal digital assistant for Android phones, once you try it, is incredibly useful. You can get a daily weather reports in your area, traffic on your commute, and what you have on your calendar for the day. You can also have complex conversations with your phone.
Just long press on the Home button or say “Ok Google” to get started!
Via: OnePlus (twitter)