Google announced the update rolling out on Gmail for Android in which Smart Reply Feature is added. Few mins before Google has announced that Android O Beta is now available for Google Pixel and Nexus devices.
Smart Reply Feature is only available in Inbox by gmail and Google Allo. Now you are keep to read how smart reply feature is working in Gmail App.
Smart Reply suggests three responses based on the email you received. The kind of replies Google is suggesting is things like “Thanks!” or “I’ll send it today” or “Let’s have a phone call on Tuesday.” Once you’ve selected one, you can send it immediately or edit your response starting with the Smart Reply text. Either way, you’re saving time.