This research asset compiles verified statistics on the adoption of AI search and generative engines, including ChatGPT, Google AI Overviews and AI Mode, Gemini, and Perplexity. It covers consumer adoption, AI Overview prevalence in search results, click-through impact, citation-source composition, and market forecasts. Every number is attributed to a named publisher and date, and figures we could not verify have been excluded.

AI-search data is early, fast-changing, and methodologically uneven. Government and academic survey data (for example, Pew Research Center) is the most reliable; vendor click-through studies (Ahrefs, Semrush, Similarweb, SparkToro) are large but use proprietary panels and definitions that are not directly comparable to one another. We flag those limitations throughout.

Executive Summary

• 44% of U.S. adults reported using ChatGPT in early 2026, up from 18% in 2023, per Pew Research Center (survey fielded February 17-23, 2026).
• About 49% of U.S. adults now use AI chatbots, up from 33% in 2024, per Pew Research Center (2026).
• Google AI Overviews reached more than 2 billion monthly users across 200+ countries by July 2025, per Google (Alphabet Q2 2025 earnings).
• ChatGPT reached 800 million weekly active users by October 2025, per OpenAI CEO Sam Altman (DevDay, October 6, 2025).
• AI Overviews appeared on 20.5% of all desktop SERPs in a 146-million-SERP sample, per Ahrefs (September 2025).
• AI Overviews reduced clicks to the top organic result by 58% in a 300,000-keyword study, per Ahrefs (December 2025).
• Pew Research found users clicked a traditional result on 8% of pages with an AI summary versus 15% without one (March 2025 browsing data).
• Gartner predicted in February 2024 that traditional search engine volume would fall 25% by 2026 as AI chatbots absorb queries, a forecast that remains contested by clickstream analysts.

Key Findings

• 34% of U.S. adults had used ChatGPT as of early 2025, about double the 2023 share, per Pew Research Center (survey February 24 to March 2, 2025, n=5,123).
• 58% of U.S. adults under 30 had used ChatGPT in early 2025, versus 10% of adults 65 and older, per Pew Research Center (2025).
• Information searching was the single most common chatbot use, cited by 42% of U.S. chatbot users in early 2026, per Pew Research Center (2026).
• AI Overviews appeared on 18% of all Google searches in a U.S. browsing study of 68,879 searches during March 2025, per Pew Research Center.
• 88% of AI summaries cited three or more sources, and only 1% cited a single source, per Pew Research Center (March 2025).
• Only 1% of pages with an AI summary saw the user click a link inside the summary, per Pew Research Center (March 2025).
• AI Overviews triggered on 34.3% of “Your Money or Your Life” (YMYL) queries, rising to 44.1% for medical YMYL, per Ahrefs (September 2025).
• 99.9% of keywords that trigger AI Overviews carry informational intent, per Ahrefs (146M SERPs, September 2025).
• Perplexity received 780 million queries in May 2025, per CEO Aravind Srinivas (public statement, 2025).
• Google AI Mode reached more than 100 million monthly active users in the U.S. and India by July 2025, per Google (Alphabet Q2 2025 earnings).
• AI platforms generated more than 1.13 billion referral visits in June 2025, up 357% year over year but still far below Google search referrals, per Similarweb (2025).
• 68.01% of Google searches ended without a click in the first four months of 2026, up from about 60% in 2024, per SparkToro analysis of Similarweb clickstream data (2026).

Consumer Adoption of AI Chatbots and Search

Survey data from Pew Research Center is the most methodologically rigorous source on U.S. adoption because it uses probability-based national panels rather than vendor traffic estimates. Adoption roughly doubled over three years.

44% of U.S. adults reported using ChatGPT in early 2026, up from 34% in 2025 and 18% in 2023. Source: Pew Research Center, “Americans and AI 2026” (June 17, 2026), survey fielded February 17-23, 2026, n=5,119. View source.

About 49% of U.S. adults reported using AI chatbots of any kind in early 2026, up from 33% in 2024. Source: Pew Research Center (2026).

24% of U.S. adults reported using AI chatbots daily in early 2026, including 12% several times a day. Source: Pew Research Center (2026).

By platform, 44% of U.S. adults reported using ChatGPT, 24% Gemini, and 17% Copilot in early 2026. Source: Pew Research Center (2026).

Adults under 50 were about twice as likely as those 50 and older to use ChatGPT (57% versus 28%) in early 2026. Source: Pew Research Center (2026).

In the 2025 measurement, ChatGPT use rose with education: 51% of adults with a bachelor’s degree and 52% with a postgraduate degree had used it, versus 18% of those with a high school education or less. Source: Pew Research Center (June 25, 2025), survey February 24 to March 2, 2025, n=5,123. View source.

Context: adoption is broad but use is shallow for most people. In early 2026, 51% of U.S. adults were non-users, and only 16% used chatbots several times a day or more. AI search has reached mass awareness but not yet daily-habit status for the majority. Source: Pew Research Center (2026).

Platform Scale: Users and Query Volume

Platform user figures come from company executives and earnings calls. They are self-reported, use varied definitions (weekly active, monthly active, queries), and are not independently audited, so treat them as directional vendor claims rather than verified market metrics.

ChatGPT reached 800 million weekly active users by October 2025, up from 400 million in February 2025. Source: OpenAI CEO Sam Altman, reported by TechCrunch from DevDay (October 6, 2025). View source.

Google AI Overviews reached more than 2 billion monthly users across more than 200 countries by July 2025, up from 1.5 billion in May 2025. Source: Google/Alphabet, reported by TechCrunch (July 23, 2025). View source.

Google AI Mode reached more than 100 million monthly active users in the U.S. and India by July 2025. Source: Google/Alphabet, reported by TechCrunch (July 23, 2025).

The Gemini app reached more than 450 million monthly active users by mid-2025, with daily requests up more than 50% from the prior quarter. Source: Google/Alphabet (Q2 2025 earnings, July 2025).

Perplexity received 780 million queries in May 2025, with the CEO citing more than 20% month-over-month growth. Source: Perplexity CEO Aravind Srinivas (public statement, 2025), reported by Just Think AI. View source.

Context: Google reported that AI Overviews drove more than 10% additional search queries for the query types that show them, which the company frames as growth rather than cannibalization. Independent analysts dispute how much of that translates to open-web traffic. Source: Google/Alphabet (Q2 2025 earnings).

AI Overview Prevalence in Search Results

Two independent measurement approaches agree on the order of magnitude: roughly one in five searches now shows an AI Overview, with sharp variation by topic. Vendor crawls (Ahrefs, Semrush) and panel browsing data (Pew) use different samples, so the exact percentages differ.

AI Overviews appeared on 20.5% of all desktop SERPs in a sample of 146,122,391 SERPs. Source: Ahrefs (September 2025). View source.

AI Overviews appeared on 18% of all Google searches in a U.S. browsing panel during March 2025. Source: Pew Research Center (analysis of 68,879 searches by 900 adults). View source.

Semrush tracked AI Overview presence rising from 6.49% of monitored keywords in January 2025 to roughly 25% in July 2025 before settling at 15.69% in November 2025. Source: Semrush AI Overviews Study (2025). View source.

By category, AI Overviews were most common in Science (43.6%) and Health (43.0%) and least common in Shopping (3.2%) and Real Estate (5.8%). Source: Ahrefs (September 2025).

AI Overviews triggered on 24.9% of non-branded queries versus 13.1% of branded queries, a 1.9x difference. Source: Ahrefs (September 2025).

Context: the Semrush time series shows AI Overview prevalence is volatile, not a steady climb. Google adjusts triggering frequently, so any single point-in-time percentage can be outdated within weeks.

Click-Through and Traffic Impact

This is the most contested area. Vendor studies consistently find that AI Overviews reduce clicks, but the magnitude varies with methodology, and Google has publicly disputed the Pew findings. We present the range rather than a single number.

Pew Research found users clicked a traditional search result on 8% of pages that contained an AI summary, versus 15% on pages without one. Source: Pew Research Center (March 2025 browsing data).

Users ended their browsing session on 26% of pages with an AI summary, versus 16% of pages without one. Source: Pew Research Center (March 2025).

Ahrefs found AI Overviews reduced clicks to the top-ranking organic result by 58% in a 300,000-keyword study. Source: Ahrefs (December 2025). View source.

In the same Ahrefs study, click reduction declined with rank, from 58.0% at position 1 to 19.4% at position 10. Source: Ahrefs (December 2025).

68.01% of Google searches ended without any click in January-April 2026, up from 60.45% in 2024 and roughly 45% in 2016. Source: SparkToro analysis of Similarweb clickstream data (2026). View source.

Context and conflict: Google publicly disputed the Pew study, arguing its methodology overstated click loss and that Search continues to send billions of clicks to the web daily. The studies also differ in scope, with Pew measuring real user browsing, Ahrefs measuring keyword-level Search Console data, and SparkToro measuring clickstream panels. They agree on direction (fewer clicks reach the open web) but not on magnitude.

Citation-Source Composition

Which sources AI engines cite determines who gets visibility in the AI era. Findings vary widely by study because each samples different queries, industries, and engines, so the numbers below should be read as competing estimates, not a settled ranking.

Across AI Overviews and standard results, Wikipedia, YouTube, and Reddit together accounted for about 15% of AI summary sources and 17% of standard search results in the Pew browsing study. Source: Pew Research Center (March 2025).

Government websites appeared in 6% of AI summaries versus 2% of standard results. Source: Pew Research Center (March 2025).

A Semrush analysis of more than 10 million AI citations found Wikipedia, YouTube, Google’s own properties, Reddit, and Amazon collectively accounted for about 38% of citations. Source: Semrush (2025). View source.

In a separate 17,551-citation study of the AEO category, Wikipedia (978), TechRadar (908), and Reddit (785) were the three most-cited domains, together about 15.3% of citations, while 54.5% of citations went to domains outside the top 100. Source: SolCrys (2025). View source.

Context: the consistent finding across studies is concentration at the top (a handful of high-authority domains) combined with a long tail (thousands of small sites each cited rarely). The exact ranking is unstable across engines and over time.

Referral Traffic from AI Engines

AI engines now send measurable referral traffic, but it remains a small fraction of Google search referrals. Similarweb clickstream data is the most-cited source here and carries the usual panel-extrapolation caveats.

AI platforms generated more than 1.13 billion referral visits in June 2025, up 357% from June 2024. Source: Similarweb (2025). View source.

Google search delivered roughly 191 billion referrals in the same period, dwarfing AI referrals by more than 100x. Source: Similarweb (2025).

ChatGPT accounted for more than 80% of AI referrals to the top 1,000 domains in 2025. Source: Similarweb (2025).

Context: AI referral growth is steep in percentage terms but starts from a tiny base. For most publishers in 2025, AI referrals did not offset declines in organic search traffic. Source: Similarweb and TechCrunch reporting (2025). View source.

Market Forecasts

Search-behavior and generative-AI market forecasts span a wide range because firms define the market differently. We report the headline figures with their sources and emphasize the spread.

Gartner predicted in February 2024 that traditional search engine volume would drop 25% by 2026 as AI chatbots and virtual agents absorb queries. Source: Gartner press release (February 19, 2024). View source.

Generative AI market size estimates for 2030 range from about $109.4 billion (Grand View Research, CAGR 37.6% from 2025) to $220 billion (ABI Research) to $213.5 billion (Next Move Strategy Consulting, CAGR 46.3% from 2024). Sources: Grand View Research, ABI Research, Next Move Strategy Consulting (2024-2025).

Context and limitation: the Gartner 25% prediction is widely cited but contested. Clickstream analysts at Datos and SparkToro found little evidence by 2025-2026 that total Google search volume was on track to fall 25%; the structural shift is in where clicks go (zero-click and AI summaries), not necessarily in raw query volume. Market-size forecasts vary by more than 2x and should be treated as scenario estimates, not precise projections.

Original Synthesis

The three derived insights below combine the verified public figures above. Each states its formula, inputs, and limitations. They are illustrative ratios, not precise measurements.

1. The AI-to-Google referral gap (scale ratio). Formula: Google search referrals divided by total AI referrals for June 2025. Inputs: 191 billion Google referrals and 1.13 billion AI referrals (both Similarweb, 2025). Result: roughly 169:1. Interpretation: even after 357% year-over-year AI growth, Google search still sent about 169 times more referral visits than all AI platforms combined. Limitation: both figures come from one vendor’s panel and depend on extrapolation; the ratio is order-of-magnitude, not exact.

2. The click-suppression spread. Formula: compare the reported click reduction at the top position across three independent studies. Inputs: Pew (clicks fell from 15% to 8% of pages with vs. without AI summaries, a 47% relative drop), Ahrefs (58% reduction at position 1), and the SparkToro zero-click rise (60.45% in 2024 to 68.01% in 2026). Interpretation: across methods, top-position click loss clusters in the roughly 45-60% range, which strengthens confidence in the direction even though no two numbers match. Limitation: the three metrics measure different things (page-level clicks, keyword-level CTR, and session-level zero-click), so they cannot be averaged into a single figure.

3. Adoption-depth ratio. Formula: daily chatbot users divided by any-use chatbot users among U.S. adults in early 2026. Inputs: 24% daily and 49% any use (both Pew, 2026). Result: about 0.49, meaning roughly half of chatbot users use them daily. Interpretation: AI chatbots have crossed from novelty to routine for a substantial minority, but half of adults still do not use them at all. Limitation: “daily use” combines several-times-a-day and once-a-day respondents and is self-reported.

Tables

Table 1: U.S. ChatGPT adoption over time

Sources: Pew Research Center, “34% of U.S. adults have used ChatGPT” (June 25, 2025) and “Americans and AI 2026” (June 17, 2026).

Table 2: AI Overview prevalence by source/method

Sources: Ahrefs (September 2025), Pew Research Center (March 2025 data, published July 2025), Semrush AI Overviews Study (2025).

Table 3: AI Overview click reduction by organic position

Source: Ahrefs, 300,000-keyword study (December 2025).

Table 4: Generative AI market size forecasts for 2030

Sources: Grand View Research, Next Move Strategy Consulting, ABI Research (2024-2025). Figures use differing market definitions and are not directly comparable.

Charts to build

• U.S. ChatGPT adoption, 2023-2026. Data: 18%, 34%, 44%. Source: Pew Research Center. Insight: adoption roughly doubled in three years. Citation-worthy because it is probability-survey data, not vendor estimates.
• Zero-click search rate, 2016-2026. Data: ~45% (2016), 60.45% (2024), 68.01% (2026). Source: SparkToro/Similarweb. Insight: a decade-long structural shift accelerated by AI Overviews.
• AI Overview click reduction by organic position. Data: -58% at position 1 declining to -19.4% at position 10. Source: Ahrefs. Insight: top rankings lose the most to AI summaries.
• AI Overview prevalence by category. Data: Science 43.6%, Health 43.0%, Shopping 3.2%, Real Estate 5.8%. Source: Ahrefs. Insight: informational and YMYL topics are most affected.
• AI referrals vs. Google referrals, June 2025. Data: 1.13B AI vs. 191B Google. Source: Similarweb. Insight: AI referrals are growing fast but remain about 1% of Google’s scale.

Inline chart (U.S. ChatGPT adoption, share of adults):

Source: Pew Research Center (2025, 2026).

Methodology

Source selection prioritized primary survey data (Pew Research Center), company-reported figures from earnings calls and executive statements (Google/Alphabet, OpenAI, Perplexity), and large-sample vendor studies (Ahrefs, Semrush, Similarweb, SparkToro). We included a statistic only when we could attribute it to a named publisher with a date and verify it against the publisher’s page or a direct report of it.

We excluded numbers we could not trace to a credible publisher, aggregated “statistics roundup” pages that did not cite primary data, and any figure that appeared only in marketing material without a study behind it. Where sources conflicted (for example, click-loss magnitude or most-cited domains), we presented the range and named each source rather than choosing one number.

Derived insights in the Original Synthesis section are simple ratios computed from the cited figures; their formulas and inputs are stated inline, and we flagged that they are order-of-magnitude, not precise. Last updated June 2026. AI-search metrics change rapidly; point-in-time percentages may be outdated within weeks.

Source Quality

Tier 1 (primary, survey, official): Pew Research Center (probability-based national surveys and browsing panel); Gartner (analyst forecast, primary publication); company-reported figures from Google/Alphabet earnings, OpenAI, and Perplexity (self-reported but primary to the companies).

Tier 2 (credible market research and vendor studies): Ahrefs, Semrush, Similarweb, SparkToro, SolCrys; market-size firms Grand View Research, ABI Research, Next Move Strategy Consulting. Large samples but proprietary panels and definitions; not independently audited.

Tier 3 (reputable journalism and reporting): TechCrunch, Search Engine Land, Digiday. Used to confirm executive statements and study findings, not as original data sources.

Most Quotable Statistics

• “44% of U.S. adults reported using ChatGPT in early 2026, up from 18% in 2023.” Source: Pew Research Center (2026).
• “AI Overviews reduced clicks to the top organic result by 58%.” Source: Ahrefs (December 2025).
• “68% of Google searches ended without a click in early 2026.” Source: SparkToro/Similarweb (2026).
• “Google AI Overviews reached more than 2 billion monthly users by July 2025.” Source: Google/Alphabet (2025).
• “ChatGPT reached 800 million weekly active users by October 2025.” Source: OpenAI (2025).

Data Limitations

Company user figures (weekly active users, monthly active users, queries) are self-reported and use inconsistent definitions, so cross-platform comparison is unreliable. Vendor click-through studies use proprietary clickstream and Search Console samples that differ in scope and cannot be averaged. Google has publicly disputed at least one major click-loss study (Pew). Most rigorous adoption data is U.S.-only (Pew); global adoption is less well measured. Market-size forecasts vary by more than 2x. Citation-source rankings differ sharply by study and engine. AI-search metrics change month to month, so any single figure has a short shelf life.

Recommended Dataset Fields

For a downloadable CSV, suggested columns: metric_name; value; unit; geography; time_period; publisher; publisher_tier; sample_size; methodology; source_url; date_accessed; uncertainty_flag; notes.

Press Summary

AI search moved from novelty to mainstream by 2026. Pew Research Center found 44% of U.S. adults had used ChatGPT in early 2026, up from 18% in 2023, and about half of adults now use AI chatbots of some kind. Distribution is dominated by Google, whose AI Overviews reached more than 2 billion monthly users by mid-2025, while ChatGPT hit 800 million weekly users by October 2025. The shift is reshaping web traffic: AI Overviews appear on roughly one in five Google searches, Pew found users click traditional results far less often when an AI summary is present (8% versus 15%), and Ahrefs measured a 58% click reduction to the top organic result. By early 2026, SparkToro estimated 68% of Google searches ended without a click. AI referral traffic is growing fast (up 357% year over year per Similarweb) but remains roughly 1% of Google’s referral scale. The data is early and vendor methodologies conflict, so magnitudes should be read with caution.

Suggested Headlines

• ChatGPT Use Among U.S. Adults Hit 44% in 2026, Pew Finds
• AI Overviews Now Appear on One in Five Google Searches
• The 58% Problem: How AI Overviews Are Cutting Clicks to Top Results
• 68% of Google Searches End Without a Click in 2026
• AI Referral Traffic Grew 357% but Is Still 1% of Google’s Scale

FAQ

What share of Americans use ChatGPT? 44% of U.S. adults reported using ChatGPT in early 2026, up from 34% in 2025 and 18% in 2023. Source: Pew Research Center (2026).

How many people use AI chatbots overall? About 49% of U.S. adults used AI chatbots of some kind in early 2026, with 24% using them daily. Source: Pew Research Center (2026).

How many users does Google’s AI Overviews reach? More than 2 billion monthly users across 200+ countries by July 2025. Source: Google/Alphabet (2025).

How many weekly users does ChatGPT have? 800 million weekly active users by October 2025, up from 400 million in February 2025. Source: OpenAI/Sam Altman (2025).

How often do AI Overviews appear in search? On about 20.5% of desktop SERPs (Ahrefs, September 2025) and 18% of searches in a user browsing panel (Pew, March 2025).

Do AI Overviews reduce clicks? Yes. Ahrefs measured a 58% click reduction to the top organic result (December 2025), and Pew found users clicked traditional results on 8% of AI-summary pages versus 15% without (March 2025).

What percentage of searches are zero-click? About 68% of Google searches ended without a click in early 2026, up from about 60% in 2024. Source: SparkToro/Similarweb (2026).

Which sources do AI engines cite most? Wikipedia, YouTube, Reddit, and Google’s own properties recur across studies; one Semrush analysis found a handful of domains accounted for about 38% of citations (2025).

How much referral traffic do AI engines send? More than 1.13 billion AI referral visits in June 2025, up 357% year over year but far below Google’s roughly 191 billion. Source: Similarweb (2025).

Will search volume really drop 25% by 2026? Gartner predicted a 25% decline (February 2024), but clickstream analysts at Datos and SparkToro found limited evidence the drop is on that track; the clearer shift is toward zero-click and AI answers.

For organizations adapting measurement and content strategy to AI search, CO Consulting tracks these datasets as they evolve. If a deeper, tailored read of your category’s AI-search exposure would help, you can book a consultation.