AI Search Statistics (2026): Adoption, AI Overviews & Zero-Click

Every AI search claim gets thrown around without a source attached. Not this list. Every number below traces back to a primary source — Pew Research, Ahrefs, Semrush, SparkToro, Gartner, Precedence Research — because if you're building a case for AI visibility work, you need numbers that survive a Ctrl+F, not a marketing blog's paraphrase of someone else's paraphrase. The honest read of this data isn't "search is dead." It's messier: AI search is absorbing a real share of clicks, and at the same time creating a smaller, more valuable channel that most brands still aren't measuring.

How many people use AI search?

More than a third of U.S. adults have used ChatGPT, and usage is concentrated in the group that will define buying behavior for the next decade. 34% of U.S. adults have used ChatGPT — roughly double the share in 2023 — and it skews young: 58% of adults under 30 have used it, versus 25% of those 50–64 and just 10% of adults 65 and older (Pew Research Center).

Scale that up across platforms and the totals get large fast:

• ChatGPT: 800M weekly active users, announced at DevDay in October 2025 (TechCrunch).
• Google Gemini app: 750M+ monthly active users, per Alphabet's Q4 2025 earnings (TechCrunch).
• Perplexity: 780M queries in May 2025 alone, growing 20% month-over-month according to CEO Aravind Srinivas (Search Engine Land).
• Gartner predicts traditional search engine volume will drop 25% by 2026 as chatbots and other virtual agents absorb queries (Gartner).

That growth isn't staying locked inside chat windows, either. ChatGPT's outbound referral traffic to publishers grew 206% year-over-year (January 2025 vs. January 2026), based on Semrush's clickstream analysis of a 200-million-user panel (Semrush). AI assistants are sending real people to real websites — just fewer of them, and through different doors than the ones you've been optimizing for.

Read those adoption numbers together and a pattern jumps out: this isn't one company's product, it's a behavior shift happening across ChatGPT, Gemini, and Perplexity at once. If your buyers are under 30, more than half have already used ChatGPT — "does AI search matter for my brand" is no longer a hypothetical for most categories.

Google AI Overviews: the numbers

AI Overviews are the biggest change to the Google results page in a decade, and their reach is uneven by design — they show up far more on questions than on purchases, and their presence changes click behavior in a way that's now well documented.

Trigger rates have been volatile rather than a steady climb. Semrush tracked AI Overview presence rise from 6.49% of tracked keywords in January 2025 to a peak of 24.61% in July, before settling back to 15.69% in November (Semrush). Intent matters more than raw volume: Seer Interactive found AI Overviews trigger on roughly 36% of informational queries versus just 5% of transactional ones (Seer Interactive) — a clear signal about where AEO work pays off first.

The click-through impact is the part that should get a board's attention:

That last row is the whole argument for AEO in one line: being cited inside the AI Overview doesn't just protect your traffic, it can more than double your click-through rate per impression. Being absent does close to the opposite. Notice, too, that the trigger-rate numbers swung sharply within a single year, climbing hard into mid-2025 before pulling back later on. Google is still actively tuning when Overviews show up, which means your exposure to this risk (or opportunity) isn't fixed; it can change month to month without you touching your own site. We go deeper on what this shift means for site owners in AI Overviews and your traffic.

Zero-click search: the numbers

Most Google searches already end without anyone clicking anywhere, and AI Overviews are accelerating a trend that predates them by years. In 2024, 58.5% of U.S. Google searches ended in zero clicks. SparkToro's Datos panel data makes it concrete: out of every 1,000 U.S. Google searches, only 360 clicks reach the open web, compared with 374 in the EU (SparkToro).

We define this pattern in more depth — and what it means for how you should build content — in the zero-click search glossary entry. Here's the opinion part: zero-click search isn't automatically bad news. It's a filter. The searches that used to end in ten blue links and a coin-flip click now end in an AI-generated answer that either names your brand or doesn't. Getting cited is the new getting clicked, and most companies are still measuring the old metric.

What makes this uncomfortable is that a zero-click search isn't a lost search — it's a search where the answer already happened, just not on your property. Your analytics dashboard shows nothing because nothing was clicked, but somewhere an AI Overview or a ChatGPT response used either your content or a competitor's to answer that question. That's the blind spot AEO auditing exists to close.

The LLM market in numbers

This isn't a niche trend with a ceiling — it's a market compounding at roughly a third every year. The global LLM market was valued at $7.77B in 2025 and is projected to reach $149.89B by 2035, a 34.44% CAGR (Precedence Research).

Enterprises are already spending like they believe it. Enterprise generative-AI spend hit $37B in 2025, roughly tripling year-over-year, with Anthropic holding a 40% share of enterprise LLM usage (Menlo Ventures). That's not consumer curiosity — that's procurement budgets, IT departments, and finance teams signing off on AI as core infrastructure, which is a much stickier commitment than an individual downloading an app.

Here's the number that should worry any SEO team relying on the old playbook alone: only 12% of URLs cited by AI assistants also rank in Google's top 10, according to Ahrefs' Brand Radar data (Ahrefs). Ranking well in Google and getting cited by ChatGPT are two different games with two different scoreboards. Winning one doesn't guarantee you're even on the field for the other — which is the entire reason AEO exists as a discipline separate from SEO, not a rebrand of it.

That overlap number is arguably the single most important one on this page if you run marketing at a company that has invested years into classic SEO. It means the skills, content structure, and citations that get you ranked on page one of Google are, for the most part, a different skill set from the ones that get you quoted inside an AI answer. You can be doing SEO well and AEO badly at the same time, and your Search Console dashboard will never tell you.

What these numbers mean for your brand

Put together, these numbers describe a trade, not a collapse: AI search reduces the volume of clicks available, but the clicks that survive are worth noticeably more. The average AI search visitor is 4.4x as valuable as a traditional organic visitor, and Semrush projects AI search traffic will overtake traditional search by 2028 (Semrush). Paired with ChatGPT's referral growth above (the full ChatGPT statistics breakdown covers user and prompt volume), that's a channel that's small today and compounding fast — the kind of channel you want to be early to, not the kind you notice after competitors already own it.

The practical takeaway isn't panic, it's measurement. If you don't know whether ChatGPT, Perplexity, or Google's AI Overview mentions your brand when someone asks a buying question in your category, you're optimizing blind — and the 12% citation-vs-ranking overlap above is exactly why your Google rankings can't tell you the answer. Start by understanding which AI search engines actually matter for your category, then build a habit of measuring AI visibility the same disciplined way you already track keyword rankings — because right now, most brands aren't tracking it at all.

None of these numbers are going to sit still. Trigger rates move, referral traffic compounds, and the market keeps growing faster than most budgets are adjusting for. Bookmark this page if you want the sourced version to send to a colleague who's still skeptical — then go check your own numbers instead of guessing at them.

Want to see where you actually stand? Run a free AEOeye audit and find out whether ChatGPT, Perplexity, and Google AI Overviews are citing your brand — or quietly citing your competitors instead.