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 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.
Smart Reply feature is coming to both Android and iOS platforms. Google also announced that in future there will be more languages in which the smart replies suggestions appear in the app. To Use this feature you should download the latest version of Gmail App from Play Store.