AI search in 2026, in numbers.

AI search is mainstream in 2026. ChatGPT has more than 1 billion weekly active users, Google says AI Overviews reach over 2.5 billion people a month and AI Mode over 1 billion, and 49% of US adults use AI chatbots. Yet Google still sends websites far more visits than any assistant, and when an AI summary appears, people click a regular result about half as often.

Every number below is dated and linked to its source. Company figures are self-reported. A vendor study comes from a firm that sells SEO, analytics or PR tools, and we say which firm and how it measured. Where good studies disagree, we show both.

01How many people use AI search?

More than a billion people use the big AI search tools, by the companies’ own counts, and about half of US adults use AI chatbots. These are the headline usage numbers as of September 2026.

Independent surveys cover fewer people, but the numbers do not come from the companies themselves. Pew Research Center asked 5,119 US adults in February 2026, and the full report is on Pew’s site.

Checked on September 28, 2026:

Big user counts do not mean most searches go through AI. In a vendor analysis of Similarweb’s US clickstream panel, SparkToro found that only 0.34% of Google searches from January to April 2026 went to AI Mode. Both can be true: a monthly user may try AI Mode once and keep searching the usual way.

02How often do AI Overviews appear?

Somewhere between about one in five searches and half of all queries, depending on who counts and how. The three best-documented figures measure different things.

Checked on September 28, 2026:

The gap is mostly about counting. Pew counted searches as people actually made them, so frequent short searches weigh a lot, while the SIGIR study counts each query in its sample once. SparkToro does not say how it got its figure. The studies also span a year of rapid change.

03What happens to clicks when AI answers appear?

People click regular results about half as often when an AI summary appears, according to the largest independent study. Vendor data points the same way, and Google disputes the gloomiest readings without publishing numbers.

Checked on September 28, 2026:

On the other side is Google. In August 2025, Liz Reid, head of Google Search, wrote that total organic clicks from Search to websites had been “relatively stable year-over-year”. In July 2026, Sundar Pichai said Google sends “billions of clicks to websites every week through AI features in Search”. Neither statement came with a baseline or a method.

How to respond to the drop is covered in SEO in the age of AI.

04Which sources do AI assistants cite?

Wikipedia, Reddit and YouTube rank near the top of most citation studies, but every engine has its own favorites, and a single engine update can move a domain’s share sixfold or more. These studies measure citations in different ways, so compare them within a row, not across rows.

Checked on September 28, 2026:

Do AI answers follow Google’s rankings? Less than you might expect. In an Ahrefs vendor study of 15,000 long-tail queries (August 2025), 28.6% of Perplexity’s cited pages ranked in Google’s top 10, against about 8% for ChatGPT, Gemini and Copilot.

Google’s own AI Overviews drifted too. Ahrefs found that 37.9% of their cited pages ranked in Google’s top 10 in March 2026 (863,000 results pages), down from about 76% in July 2025, though it also changed its method. What this means for your own pages is covered in our guide to getting cited by AI search.

05Do AI assistants prefer independent sources or brand sites?

It depends on the question, and two large vendor studies point in opposite directions. For general and “best of” questions, studies find a strong lean toward independent sources. For local, location-specific questions, brand-managed pages and listings dominate.

• Independent sources win: Muck Rack’s vendor study found earned media, meaning independent coverage, in 84% of AI citations, with paid content at 0.3%. An academic study by Chen et al. (September 2025) found a “systematic and overwhelming bias towards Earned media” in AI search.

• Brand sites win: a Yext vendor study of 6.8 million citations (July to August 2025) found 86% came from sources brands control, such as their websites (44%) and listings (42%). Forums like Reddit were 2%. Its queries covered retail, finance, healthcare and food service, with location context.

A fair reading: for “open now near me”, a restaurant’s own listing is the likely citation; for “best project management tool”, an independent review is.

06How much traffic do AI assistants send?

Far less than Google, but it is growing fast. For most sites, AI assistants are still a small channel measured in fractions of a percent.

Ahrefs puts the gap at 190 times more traffic from Google than from ChatGPT, using analytics data from the 76,000 sites. Semrush’s clickstream study adds that over 30% of ChatGPT’s referral traffic goes to just 10 domains, and over 20% to Google itself.

How often ChatGPT searches the web at all is another point of disagreement. Checked on September 28, 2026:

The prompt sets differ: Semrush counts all prompts in its panel, while Graphite tested comparison questions only. To measure what assistants send your own site, see our guide on tracking AI traffic.

AI companies also take far more than they send back. Cloudflare, which sells bot management, measured crawl-to-referral ratios in July 2025: pages crawled for every visit referred. Anthropic’s was 38,066 to 1, OpenAI’s 1,091 to 1, Perplexity’s 195 to 1, Microsoft’s 40.7 to 1 and Google’s 5.4 to 1.

By June 2026, Cloudflare says 52% of the crawler requests it sees were for AI training, up from 22% in spring 2025. Which crawlers those are, and how to control them, is in our AI crawlers list.

07Where do the numbers disagree?

The studies above disagree in five places. When you quote one of these numbers, quote its method with it.

Before you reuse any of these in your own work, check the source the way our guide to AI research tools suggests. For turning the numbers into a plan, see our AI marketing playbook.

08FAQ

Next, learn how to get cited by AI search, or track the traffic AI sends you.