Google Rolls Out Gemini 3 as Default for AI Search Globally

Google announced Tuesday that Gemini 3 is now the default model powering AI Overviews for Search users worldwide, marking a significant expansion of the company's frontier AI capabilities into its core product.

The update, detailed by Google's Robby Stein, also introduces a more fluid transition between traditional search results and conversational AI. Users can now ask follow-up questions directly from an AI Overview and seamlessly enter AI Mode for deeper back-and-forth dialogue—all while preserving context from the initial query.

"People come to Search for an incredibly wide range of questions," Stein wrote. "For complex questions or tasks where you need to explore a topic deeply, you should be able to seamlessly tap into a powerful conversational AI experience."

What's Actually Changing

The upgrade addresses a friction point in Google's AI search experience. Previously, moving from a quick AI-generated summary to a full conversation required multiple steps. Now that handoff happens with a single tap on mobile devices globally.

Google's internal testing found users prefer this natural flow into conversation, particularly when they can retain context from their original search. The company frames it as "one fluid experience"—quick answers when that's sufficient, deeper exploration when needed.

This represents Google's continued push toward agentic search, where the AI doesn't just retrieve information but actively reasons through complex queries. Gemini 3 Flash, the model now running these interactions, can handle long-form questions and issue internal queries through retrieval-augmented generation to pull fresh, real-time data.

Market Context

Alphabet shares traded at $327.93 as of January 28, down 0.64% over 24 hours. The company's market cap sits at approximately $4.03 trillion.

The timing puts pressure on Microsoft's Copilot Search, which has been competing for the same conversational AI search territory. Both companies are racing to transform search from keyword matching into something closer to an AI assistant that can plan, reason, and complete multi-step tasks.

For advertisers and SEO professionals, the shift raises familiar questions about visibility in an AI-mediated search environment—though Google continues emphasizing "prominent links to continue exploring" within the experience.