Google has shipped the largest overhaul of its Search box in more than 25 years, pairing it with Gemini 3.5 Flash as the new default model in AI Mode for all users worldwide. The company confirmed both changes at I/O on May 19, 2026, alongside a milestone it quantified directly: AI Mode has surpassed one billion monthly users one year after launch, with queries more than doubling every quarter since debut. Queries hit an all-time high last quarter, according to Google's own figures.

The new Search box is rolling out now in every country and language where AI Mode is available. It dynamically expands to give users room for longer prompts, offers AI-powered suggestions that go beyond autocomplete, and accepts text, images, files, videos and Chrome tabs as inputs. Google says users will still receive a standard range of Search results alongside the AI features. Google framed this as a confirmed, shipped change, not a test.

The announcements move Search deeper into three areas publishers and SEOs should watch closely: background agents, on-the-fly generative UI, and expanded personal context.

Search agents run 24/7 in the background

Google is introducing what it calls information agents — AI agents users create, customize and manage directly in Search. These agents run continuously in the background, monitoring blogs, news sites, social posts and Google's real-time data on finance, shopping and sports, then sending synthesized updates when conditions the user defines are met. Google's examples include an agent scanning apartment listings against a user's stated requirements, or alerting a fan the moment an athlete announces a sneaker collaboration.

Information agents launch first for Google AI Pro and Ultra subscribers this summer.

Agentic booking is also expanding. Search will aggregate live pricing and availability for local experiences and services — Google's example is a private karaoke room for six on a Friday night that serves food late — with direct links to complete the booking through a chosen provider. In select categories including home repair, beauty and pet care, users can ask Google to call businesses on their behalf. These booking capabilities roll out to everyone in the U.S. this summer.

For local businesses and service providers, this is the most concrete signal in the announcement: Google is positioning itself as an intermediary that assembles pricing, availability and even phone contact, which could compress the click path to merchant sites in affected verticals.

Agentic coding builds custom UI on the fly

Google is bringing Antigravity, its agentic development platform, together with Gemini 3.5 Flash's coding capabilities directly into Search. Instead of a static answer, Search can assemble custom generative interfaces — interactive visuals, tables, graphs and simulations — built at query time. Google's examples include visualizing astrophysics concepts or the mechanics of a watch.

Beyond one-off answers, Search can build persistent custom dashboards and trackers for recurring tasks such as wedding planning, a home move or a fitness routine. Google describes these as "mini apps" that draw on real-time sources including reviews, live maps and local weather data. Generative UI capabilities will be available to everyone in Search this summer at no charge, while building custom experiences with Antigravity arrives in the coming months, starting with Google AI Pro and Ultra subscribers in the U.S.

For site owners, generative UI represents a further shift away from the ten blue links model: the answer itself becomes a bespoke application assembled by Google, sourced from data that may include third-party reviews and local information.

Personal Intelligence expands to nearly 200 countries

Google also expanded Personal Intelligence in AI Mode to more users across nearly 200 countries and territories in 98 languages, with no subscription required. Users can securely connect Gmail and Google Photos, with Google Calendar support coming soon. Google emphasized that the feature is opt-in: "You're always in control — you choose if and when you want to connect apps like Gmail and Google Photos."

What is confirmed versus what to watch

Everything announced at I/O is a confirmed Google statement: the Search box redesign, Gemini 3.5 Flash as the AI Mode default, conversational follow-ups from AI Overviews (live today on desktop and mobile worldwide), information agents, agentic booking and calling, generative UI, and the Personal Intelligence expansion. Google did not publish traffic, click-through or publisher impact data, so any claims about how these features will reshape referral traffic remain speculation — the one-billion-user and quarterly query-doubling figures come from Google itself.

The staggered rollout creates a monitoring schedule. The intelligent Search box starts today; conversational AI Mode flows are live now; information agents, agentic booking, U.S. business calling and generative UI arrive this summer; Antigravity-built mini apps follow in the coming months for paid subscribers first. Publishers in local services, shopping, travel and real estate should track how agentic booking and information agents surface their listings, and whether Google's synthesized updates and direct booking links change referral patterns once the summer rollouts reach full availability.