Smart Reply now gives you three quick responses on Gmail1
Google says that the feature is rolling out now in English speaking countries, and will come to Spanish speaking regions in a matter of weeks. It uses Machine Learning to remember if you naturally would respond to an everyday occurrence with hyperbole ("Thanks so much! That is an amazing offer and we appreciate it greatly!), or with a laid back response (Thanks.) and suggest the appropriate answer. Keep in mind that you can always choose one of the Smart Replies and start editing it or adding to it.
Considering that 12% of replies in the mobile Inbox app are a Smart Reply, the move by Google today should greatly expand the feature's use. If you are a Gmail user, be on the look out for the three Smart Reply boxes the next time you're responding to an email.