Google AI Overviews: Tracker, Timeline and Statistics

Nick Fox, Google's senior vice president of Knowledge and Information, wrote on LinkedIn that Google is "now sending billions of clicks to websites every week through AI features in Search alone", on top of the "billions of clicks to the web every day" it says Search sends overall.

As Search Engine Journal reported, it is the first time Google has attached a specific number to AI-search referrals, offered to rebut the argument that AI answers are choking off traffic to publishers.

The figure cannot be checked. Google gave no baseline, denominator or timeframe, and Search Console still reports only impressions for AI features, not clicks, so no publisher can reconcile the aggregate against its own numbers.

As Forbes noted, Google is counting total clicks across an enormous query base while the independent studies measure click rates, so both can hold at once: total clicks can rise even as the click-through rate on any single result falls, which Ahrefs put at 58% lower on the top result when an AI Overview is present.

It extends the counterpoint Liz Reid made in 2025, now with a headline number but still without the query-level data that would settle the dispute.

The Commission issued two sets of binding specification measures to Google on July 16: one opening up Android features to rival AI assistants, and one, the reason this sits on an AI Overviews page, spelling out how Google must share Search data under Article 6(11) of the Digital Markets Act.

The decision "specifies that AI chatbots offering search functionalities are eligible to receive shared data, and that, subject to anonymisation, Google should share the same data that it collects to optimise its own search services".

The Commission is explicit about why that clause exists: sharing matters "particularly" for AI chatbots with search functions "to avoid that Google Search's advantage extends to Google's AI chatbots too".

Google has owed rivals this data since the DMA took effect, but the Commission says its own offer was stripping out "between 90 and 100% of unique search queries" and "unduly restricting the potential pool of beneficiaries by excluding AI Chatbots that provide search services", so there had been "no meaningful uptake".

The new measures cover anonymised ranking, query, click and view data from free and paid search: queries entered at any access point, query language and device type, the URLs users viewed, what they did with the results and where each result ranked.

Recipients may use it to improve query understanding, indexing, and the ranking and retrieval systems that AI chatbots rely on for grounding, but they may not train general-purpose AI models on it, use it for advertising or profiling, or systematically replicate Google's results.

Eligibility is narrow: a genuine EU search service with at least 50,000 monthly EU users and two years of operation, or a startup under two years old that has raised more than 50 million euros, plus an independent audit before any data changes hands.

The clock is running, with the eligibility form and an applications page due by the end of August 2026, template licences and test samples by September, the finished dataset by November, and a final pricing offer by January 2027.

Nothing here changes what AI Overviews or AI Mode do, and the decision names neither surface. What it changes is the raw material available to everyone building against them: from next year, a Perplexity or a privacy-focused engine can ask for the query and click stream that only Google Search collects at scale, on a minimum seven-day delay and for up to five years each.

Whether that produces credible alternatives to Google's AI answers, or a compliance process that stalls the way the last offer did, is the thing to watch.

Common Sense Media's Youth AI Safety Institute rated Google Search's AI features "Unacceptable Risk", its lowest tier, for children. Across 2,624 test interactions in seven test plans, AI Overviews and AI Mode failed seven of the Institute's eight AI principles and all five severe-harm "Red Lines". The assessment's headline: "Google Search's AI answers are not safe enough to be kids' default answer machine."

AI Overviews, the answer that appears automatically above the results, fared worst: it pointed users to an appropriate resource in only 58% of 214 crisis prompts, where AI Mode managed 77%, and it missed 29% of explicit statements referencing suicide.

As PBS reported, neither feature can be turned off by parents or schools, unlike Google's standalone Gemini app, even though roughly three-quarters of US teens and tweens now use AI answers in search. Google said its AI features have "strong quality and safety guardrails" and called the testing flawed for using "a narrow set of ambiguous and contrived queries".

In a post marking Google Images' 25th anniversary, Google said it is bringing image generation directly into AI Overviews in Search: "Using our latest Nano Banana model, this update transforms a simple text prompt into a high-quality, custom visual made completely from scratch." 9to5Google identifies the model as Nano Banana 2 Lite.

Google says the feature "will start to roll out over the coming weeks in English, for all regions that currently support image creation in AI Mode", so availability follows the existing AI Mode image-creation footprint rather than the full AI Overviews footprint. It extends the merged AI search experience: the generative image tools already in AI Mode now sit in the overview above the results.

Saharsh Agarwal of the Indian School of Business and Ananya Sen of Carnegie Mellon's Heinz College ran what they describe as the first randomized field experiment on AI Overviews, "The Impact of Google AI Overviews on Publisher Traffic and User Experience".

A custom browser extension recruited through Prolific put 1,065 US desktop Chrome users into groups: some saw Google normally, some had AI Overviews hidden, and the rest were sent to AI Mode.

Across 396 control and 374 treatment users the study analysed 68,089 unique searches, with an AI Overview present on roughly 41% of queries. Every other click figure on this page compares queries that happened to have an overview with queries that did not; this one changes the overview and holds the user constant.

Outbound organic clicks rose from 0.37 per search to 0.62 when the overview was hidden, and the probability of a search ending with no click fell from 0.73 to 0.54, which the authors put at a 39.8% reduction in clicks attributable to AI Overviews.

The effect sits almost entirely on informational queries, worth about 0.26 extra clicks per search; navigational and transactional estimates were inconclusive.

The June revision added the part that matters most for the argument Google has been making: across bounce rate, quick returns to the results page and time on site there was no statistically significant difference between the clicks sites get with overviews and the extra ones they get without.

Google's public position is that click quality is up even if volume moved; on this panel the recovered clicks were ordinary clicks.

Two caveats belong with the numbers. It is an SSRN working paper that has not been through peer review, first posted in April 2026 and last revised on 17th June, and 1,065 self-selected desktop Chrome users in the US is a small panel next to the multi-million-keyword trackers elsewhere on this page. What it buys in exchange is causality, which none of the others can claim.

SparkToro's zero-click study, run on Similarweb desktop and mobile clickstream data for US Google searches from January to April 2026, found searches ending without a click 68.01% of the time, as Search Engine Land reported. That is 7.56 points above the 60.45% SparkToro measured in 2024, against 64.82% in 2020 and 50.33% in 2019.

Over the two years to 2026 the share of searches producing at least one click fell 9.51 points, a 22.9% decline, while the share that led to another Google search rose 7.2 points. Searchers are not only clicking out less, they are staying inside Google and searching again.

What the study does not do is attribute the shift to AI Overviews. It measures clicks, not overviews, and the AI-answer figures it cites for context (overviews on more than 20% of searches, top-result click-through down nearly 60% where one appears) come from the same third-party trackers already in the statistics section.

SparkToro also cautions that its year-to-year comparisons rest on different providers, panels and methodologies, so the 2019 to 2026 line is a trend rather than a like-for-like series. Its own 2019 figure is the useful check on any single-cause story: half of all searches already ended without a click five years before AI Overviews launched.

The AI Mode figure has no equivalent anywhere else on this page. Just 0.34% of searches in the panel moved into AI Mode across those four months, which SparkToro says means the tab "played only a limited role" in the click decline.

That does not contradict Google's 1 billion monthly users, which counts people rather than share of searches, but it is the sharpest illustration yet of the gap between the two: a very large user base and, on this panel, a very small share of actual search volume.

In the period measured, whatever was happening to clicks was happening on the ordinary results page with an overview on top of it, not inside the AI Mode tab.

The UK Competition and Markets Authority, using the strategic market status it gave Google in October 2025, ordered Google to let publishers stop "their content being used to power AI features in search, such as AI Overviews" without losing their normal search rankings.

The CMA calls the opt-out a world first, and it is the first binding regulatory remedy against AI Overviews anywhere. Sarah Cardell, the CMA's chief executive, framed it as bargaining power: "With features like AI Overviews rapidly reshaping online search, it is crucial that content publishers, including news organisations, have appropriate bargaining power over how their content is used."

Three requirements beyond the headline opt-out matter for site owners. Google must also let publishers "opt-out of allowing their content to be used for the 'fine-tuning' of AI models", a separate lever from the AI-features opt-out and from the Google-Extended token that governs Gemini training.

It must attribute publisher content "using clear links" in AI-generated results. And while it has nine months to implement everything, the CMA says it "expects important parts of the controls to become available to publishers well before that deadline", with compliance reports carrying key data and metrics due every six months for the first year.

The order grew out of the conduct-requirements consultation the CMA opened in January, and Google shipped the Search Console side of it the same day the order landed.

On 28th May 2026 the Regional Court of Munich I granted a temporary injunction (case 26 O 869/26) barring Google from spreading false factual claims about two Munich-based publishers through its AI-generated search overviews.

For certain queries the overview had linked the two companies to scams, subscription traps and dubious business practices, mixing them up with genuinely questionable firms and drawing connections that appeared in none of the sources it cited.

Google must remove the material and stop its systems generating comparable claims about them.

The reasoning is what makes it a landmark. The court found the AI function "generates a coherent, flowing text" that "appears as direct information from Google, not as a mere forwarding of third-party content", as heise reports, and treated Google not as an intermediary passing on someone else's words but as the direct author of its own false statement.

That is the search safe harbour that has protected result pages for two decades, and it does not extend to a generated answer. heise notes the decision goes further than an earlier Frankfurt case, which declined a cease-and-desist application rather than banning specific claims.

Two caveats. This is summary proceedings, a preliminary injunction rather than a final judgment, and Google retains the right to appeal; at the time of the reporting Google had not commented.

It also binds Google only as to these two publishers and these claims. What travels is the principle, and it arrived four days before the CMA order: within a week, AI Overviews acquired a publisher opt-out in the UK and an author in Germany.

Any answer engine that generates prose about identifiable people or companies now has a European precedent to reckon with, which is the same question the Ontario defamation suit puts to a Canadian court.

Google brought preferred sources into AI Overviews and AI Mode: websites a searcher has picked in Search personalization settings are now clearly labeled when they appear in AI responses. Product manager Duncan Osborn wrote that "people are twice as likely to click through to a Preferred Source" and that more than 345,000 unique sources had already been selected.

9to5Google noted the labels initially appear only when a chosen site naturally surfaces in a response, with Google planning to have preferred sources appear more often in AI features over time; sources are managed at google.com/preferences/source.

The lever had become usable outside English four weeks earlier, when preferred sources expanded to every language Google Search supports. The same announcement added a prominent carousel that highlights preferred sources on searches about developing topics, promised a similar carousel of perspectives from forums, discussions and social media, and expanded the "Highly Cited" badge to more web article links.

For publishers this is a rare direct lever inside the AI answers: readers who pick a site see it labeled, and click it more.

At I/O 2026 Google merged AI Overviews and AI Mode into one integrated search experience across desktop and mobile worldwide. The overview is now the quick answer, follow-ups continue into an AI Mode conversation, and both launch from what Google called its biggest search box upgrade in more than 25 years.

Gemini 3.5 Flash became the default model for the merged experience globally, and Sundar Pichai's keynote put AI Overviews past 2.5 billion monthly active users and AI Mode past 1 billion.

The merger formalizes what the January handoff started: AI Overviews are no longer a feature bolted on top of the results but the entry point to Google's AI search. Google Marketing Live, held alongside I/O, previewed Gemini-generated conversational ad formats for the new experience.

Google announced five link changes for AI Mode and AI Overviews, framed as helping people explore the web.

They are: a Further Exploration section with suggestions for where to go next at the end of many AI responses, more links placed directly next to the text they support, a hover preview showing the website name or page title before a click, labels that make links from a searcher's active news subscriptions stand out, and previews of perspectives from public discussions and social media with the creator or community named.

Search product vice president Hema Budaraju wrote that in testing people were "significantly more likely to click links that were labeled as their subscriptions". Coverage framed the changes against the click-loss studies this page tracks, and the preferred-sources rollout three weeks later extended the same idea from subscriptions to any site a reader chooses.

Ashley MacIsaac, the Juno-winning Cape Breton fiddler, filed a statement of claim against Google LLC in the Ontario Superior Court of Justice in February, seeking at least C$1.5 million.

An AI Overview about him stated he had been convicted of sexual assault, internet luring involving a child and assault causing bodily harm, and that he was listed on the national sex offender registry.

None of it was true: the summary had folded in coverage of a different man in Atlantic Canada who shares his surname. The damages sought are split into C$500,000 each of general, aggravated and punitive damages.

The harm was immediate and offline. The Sipekne'katik First Nation confronted him with the summary in December 2025 and cancelled one of his scheduled concerts, later issuing a public apology.

Billboard Canada quotes him saying "I feared for my own safety going on stage because of what I was labelled as".

The claim argues Google "knew, or ought to have known, that the AI overview was imperfect and could return information that was untrue", and puts the liability question plainly: "If a human spokesperson made these false allegations on Google's behalf, a significant award of punitive damages would be warranted. Google should not have lesser liability because the defamatory statements were published by software that Google created and controls."

Google has not commented on the suit; in December it said AI Overviews are "dynamic and frequently changing" and that it uses error cases to improve its systems. It is the first high-profile case brought by an individual rather than a publisher or a company, and it asks a Canadian court the question the Munich court answered three weeks later in Germany: when a generated answer defames someone, is that Google speaking.

Google rolled preferred sources out globally in all supported languages on April 30, after running the feature worldwide in English only since late 2025. Readers add outlets with the star icon next to Top Stories or at google.com/preferences/source, per 9to5Google.

Google's numbers at the time: readers are twice as likely to click through to a site once they have marked it as a preferred source, and more than 200,000 unique sites had been picked (a figure Google put at 345,000+ four weeks later).

It earns a place on this page because of what happened next. On May 27 Google extended the same selections into AI features, so a reader's picks are labeled inside AI Overviews and AI Mode answers, one of the few direct publisher levers in AI search.

Until this expansion that lever only worked for English-language readers. Search Engine Journal notes that Google describes the control as working alongside its ranking systems to up-rank sites a user has asked for, while its documentation is explicit that preferred-source picks do not override relevance.

Seer Interactive's 2026 update, drawn from 5.47 million queries, is the first large dataset to show click-through rates on AI Overview queries moving back up: organic CTR recovered from 1.3% in December 2025 to 2.4% in February 2026.

The more actionable finding: brands cited inside an AI Overview earn roughly 120% more organic clicks per impression than uncited brands on the same queries. Recovery or not, CTRs remain far below the pre-AIO baseline (Seer's September 2025 analysis had informational-query organic CTR down 61% since June 2024), so the remaining clicks concentrate on whoever is cited in the answer.

The CMA opened the consultation that produced the June order on 28th January, and it proposed exactly what publishers had been asking for since 2025: "Publishers will be able to opt out of their content being used to power AI features such as AI Overviews or to train AI models outside of Google search", plus practical steps to attribute publisher content in AI results.

Sarah Cardell, the CMA's chief executive, promised "a fairer deal for content publishers, particularly news organisations, over how their content is used in Google's AI Overviews". Responses were due by 25th February.

Google's answer, reported when the responses were published, was a qualified yes. The Register reported that Google said it would eventually let sites opt out of generative AI features in Search, and noted that "details and timelines, however, were conspicuously absent". Google made the same argument in public that month: that separating AI features from ordinary Search is a large engineering problem, because one crawl and one index feed both.

This is the step our timeline used to skip, and it is worth keeping in view when Google says a control is coming. The distance from "we are exploring updates to our controls" in March to a shipped Search Console toggle in June was about ten weeks, and it closed only once the CMA made it a binding requirement.

The reason to date the commitment is that it lets you check the gap between an intention stated to a regulator and a control a publisher can actually switch on.

Chartbeat segmented its global client network by size and found the damage scales inversely with the publisher. Search referral traffic to small publishers (1,000 to 10,000 daily page views) fell 60% over two years, mid-sized publishers (10,000 to 100,000) lost 47%, and large publishers (over 100,000) lost 22%.

Narrowing to a single year, page views from Google Search fell 34% between December 2024 and December 2025, and Google Discover fell 15% over the same period. Axios received the data exclusively; Chartbeat has not published it independently.

The second finding matters as much as the first. ChatGPT referrals grew more than 200% in that window, but chatbots still account for less than 1% of publisher page-view referrals. The traffic leaving search is not arriving anywhere else, which is the hole in the argument that publishers are simply being redistributed to AI platforms.

Read it alongside the click studies in the statistics section rather than instead of them. Those measure the click rate on a query; this measures arrivals at a site, so it captures everything happening at once, AI Overviews plus ranking changes plus Discover volatility plus platform shifts, and it cannot attribute the loss to any single cause.

What it does establish is the distribution: the sites with the least capacity to absorb the loss are taking nearly three times the hit of the largest ones.

BrightEdge data covering February 2025 to February 2026 across nine industries puts AI Overview presence at roughly 48% of tracked queries, up 58% year over year. Healthcare leads at 88%, followed by education at 83% and B2B technology at 82%.

That reads dramatically higher than broad-panel figures like Semrush's 15.69%, and both are right: BrightEdge tracks commercial and enterprise keywords, where Google triggers AIOs far more often than across the whole query stream. See the statistics section for how the panels compare.

SISTRIX founder Johannes Beus measured AI Overviews across more than 100 million German keywords and found them on just over 20% of them. Where one appears, "the CTR at position 1 drops from 27% to 11%, a loss of almost 60%". Scaled across the market, SISTRIX puts the cost at 265 million organic clicks a month; averaged over every keyword, including the ~80% with no overview at all, the loss is 6.6%.

The per-industry spread is the more useful finding. Click loss runs "from 1% to over 24%": recipe sites lose 1.07% and transactional destinations like Booking.com and Amazon under 2%, while news and media lose 7.37%, parenting and baby content over 24% and health portals up to 30.15%.

The pattern is the one every study keeps finding, that the exposure is not the query volume but how completely an answer can be summarized, and Google restricted health queries after the Guardian investigation in the same window this data covers.

This is the largest keyword sample on this page and the only one measuring a non-English market, which is worth noting when the German 59% sits next to Ahrefs' 58% and the US randomized experiment's 39.8%. As Search Engine Journal put it, whether the gap between markets "reflects actual differences between the markets or differences in measurement methodology isn't clear from the available data".

SISTRIX is a commercial SEO analytics provider measuring its own keyword database, so this is panel data like everything else in the statistics section, not ground truth.

Sulina Connal, Google's managing director for news and books partnerships in Europe, told the FT Strategies News in the Digital Age conference in London on 11th February that Google was "exploring more granular controls" for publishers, but that building them is hard: "Because AI is integral to how search works, implementing the new controls is a complex engineering, huge engineering project."

The technical claim is real enough, one crawl and one index feed both ordinary ranking and the grounding of AI answers, but Paul Bannister of Raptive publicly noted that Google's engineering capacity elsewhere makes the difficulty hard to credit. Google shipped the control four months later, after the CMA required it.

The commercial half landed at the same event. FT chief executive Jon Slade announced that "Google and the FT have now signed a deal licensing FT journalism into a series of AI pilot projects", and Press Gazette reported Google pursuing "more focused deals" with news publishers, following December 2025 agreements with the Guardian and the Washington Post that included cash and extended display rights.

Connal said discussions with publishers were "creating change in our product". That is the pattern France later formalised: Google negotiating individually, market by market, rather than accepting a general rule.

The backdrop, in the same coverage, was Chartbeat's finding that global Google Search traffic to publishers dropped by about a third in 2025, which Google disputed by suggesting traffic had shifted toward emerging news sources. Our fuller Chartbeat breakdown published a month later. February is the month the two tracks became visible together: Google explaining why publishers could not opt out, while paying some of them for the content it was summarising.

The European Publishers Council filed a formal antitrust complaint with the European Commission over AI Overviews and AI Mode, arguing Google repurposes publisher content into AI answers that keep users on Google. It is the second formal publisher complaint in the EU, following the Independent Publishers Alliance in mid-2025, and it lands two months after the Commission opened its own Article 102 investigation into Google's AI search features.

Ahrefs' February 2026 update, based on December 2025 data, measured position-1 CTR at 0.016 when an AI Overview is present versus 0.039 without one, a 58% reduction. Its original March 2025 analysis of 300,000 keywords had put the gap at 34.5%: on this dataset, the click cost of an AIO deepened as the feature matured rather than easing.

The same day, Alphabet's Q4 2025 earnings reaffirmed AI Overviews at more than 2 billion monthly users. The two numbers together are the AIO story in miniature: enormous, still-growing reach, and worsening click economics for the sites the answers are built from.

Google made Gemini 3 the default model for AI Overviews globally, the biggest model upgrade in the feature's history, two months after routing only the hardest queries to it. On mobile, an AI Overview can now hand off into an AI Mode conversation carrying the query and answer context, which Google described as "one fluid experience... a quick snapshot when you need it, and deeper conversation when you want it".

The handoff was the first real integration between the two surfaces, and it previewed the full merger that arrived at I/O in May.

Google removed or restricted AI Overviews on a set of health queries after a Guardian investigation published January 2 documented misleading and potentially harmful health advice in AIO answers. Google disputed the investigation's conclusions while quietly narrowing triggering on the affected queries.

The sequence mirrors May 2024, when the "glue on pizza" failures led to restricted triggering and new guardrails within weeks. YMYL queries remain the highest-risk surface for AI answers, and this is the second time Google has pulled AIO coverage back there under public pressure.

Google expanded AI Overview ads to 11 additional countries including Australia, Canada, India, Indonesia and Singapore, on English-language queries, without an announcement. It is the first time AIO ads have run outside the United States, where they launched on mobile in October 2024 and expanded to desktop in 2025. AI Overviews stopped being a US-only revenue surface with this change, which is worth remembering when Google describes AI monetization as early-stage.

Semrush's refreshed AI Overviews study, tracking more than 10 million keywords, is the best longitudinal prevalence series available: 6.49% of queries showed an AIO in January 2025, the share peaked at 24.61% in July, and it settled back to 15.69% by November 2025.

The shape matters as much as the level. Google actively tunes when AI Overviews trigger, so prevalence is not a one-way ratchet and any single-month figure dates quickly. That volatility is why we report multiple panels side by side in the statistics section.

The European Commission opened a formal antitrust investigation under Article 102 TFEU, the EU's abuse-of-dominance rules, into Google's use of online content for AI purposes.

The Commission is assessing whether AI Overviews and AI Mode are built on web publishers' content "without appropriate compensation for that, and without the possibility for publishers to refuse without losing access to Google Search", and whether Google uses YouTube content for its own AI models while restricting rival AI developers' access to it.

Opening proceedings does not prejudge the outcome, but this is the most serious regulatory threat AI Overviews has faced, reaching model training as well as the answers themselves. It followed the Independent Publishers Alliance's June complaint over the same features; the European Publishers Council filed its own in February 2026.

Google launched Gemini 3 and brought it to Search the same day, which it called "the first time we've brought a Gemini model to Search on day one". Search began routing its "most challenging questions in AI Mode and AI Overviews" to the frontier model while faster models keep handling simpler queries, with the rollout starting in the US.

Day-one deployment in Search signaled how central AI answers had become to Google's model launches. The routing tier turned out to be an interim step: Gemini 3 became the default AI Overviews model worldwide in late January 2026.

The UK Competition and Markets Authority confirmed strategic market status for Google in general search and search advertising under the digital markets competition regime, finding "substantial and entrenched market power" in a market where Google handles more than 90% of UK searches. The designation explicitly covers AI Overviews and AI Mode; the standalone Gemini assistant stayed outside it, kept under review as the market develops.

The status is not a finding of wrongdoing, but it lets the CMA impose "proportionate, targeted interventions" on how Google runs search in the UK. That authority is what the regulator used the following June, when it ordered an AI Overviews opt-out for publishers.

Penske Media, publisher of Rolling Stone, Variety and Billboard, sued Google in the US District Court for the District of Columbia (case 1:25-cv-03192), the first lawsuit by a major US publisher aimed squarely at AI Overviews. The complaint says AI Overviews now appear on roughly 20% of Google searches that return links to Penske sites, and blames the feature for a one-third drop in affiliate revenue from its late 2024 peak.

The suit is an antitrust claim: Penske argues Google leverages its search monopoly to coerce publishers into letting their content be republished in AI summaries and used for AI training. Google said AI Overviews "make Search more helpful and send traffic to more sites" and that it would "defend against these meritless claims".

Liz Reid, VP and Head of Google Search, wrote that "total organic click volume from Google Search to websites has been relatively stable year-over-year" and that average click quality has increased, with Google sending slightly more quality clicks, visits where the user does not quickly bounce back, than a year earlier.

Reports of dramatic aggregate traffic declines, she wrote, are "often based on flawed methodologies, isolated examples, or traffic changes that occurred prior to the roll out of AI features in Search".

Published two weeks after Pew measured result clicks falling to 8% on visits with an AI summary, the post remains Google's core counterpoint to outside click-loss studies. Reid did acknowledge change in the mix, with traffic shifting toward forums and sites offering authentic voices and in-depth content.