UPDATE: Gemini Summary Cards Are Now Default in Gmail Mobile: What to Expect

6/6/25: Google reached out with the following information in an email:

• Users can collapse a Gemini summary card and it will remain collapsed in that email thread. Additional control improvements will be coming soon, for example, if a user frequently collapses Gemini summary cards, future threads will default to a collapsed state until the user expands them again.
• Emails that do not show summary cards will continue to support user-triggered summaries with the "summarize this email" chip at the top of emails or the option to summarize using Gemini in the side panel.
• As with all of our AI features, Gmail remains committed to protecting user data and prioritizing privacy. Refer to our Privacy Hub site to learn more.

Original Story:

You didn't ask for it, but here it is: Gemini's AI summaries are now baked into Gmail on your phone, whether you want them there or not.

The new summary cards, initially announced last year as an optional side panel for Gmail, are now the default for iOS and Android. That means you'll see the AI-generated overviews automatically, right above emails that Google thinks make sense to provide them for, like longer threads, or messages with several replies.

You don't have to tap a little "summarize" button anymore, either; they'll just appear. You'll have to dig deep into the settings to opt out of the "experience." It's part of Google's continuing efforts to go all in on AI, from Search to email.

Google says that Gemini will synthesize all the key points from the email thread and drop it on top of the first email in the Gmail app. New replies will get folded into the synopsis, as well, keeping it all up to date.

So far, the feature is only available for emails in Engliish, and will still allow you to tap a button for email summaries that Google doesn't automatically create for you.

It's available starting now to all Google Workspace users, including Business Starter, Standard and Plus;
Enterprise Starter, Standard and Plus; Google One AI Premium; Customers with the Gemini Education or Gemini Education Premium add-on; and anyone who previously purchased Gemini Business or Gemini Enterprise add-ons. It will rollout immediately to Rapid Release domains and gradually to Scheduled Release domains starting on May 29.

Your Workspace admin can turn the default personalization setting on or off for all their users in the Admin console.