AI Overviews Hit 43% of Searches: The Gateway Shift

AI Overviews now appear in 43% of Google searches, up from 15% a year earlier, according to Similarweb’s new 2026 Generative AI Landscape report as covered by TechCrunch on July 27. That is a 28-percentage-point jump in twelve months — and notably, neither TechCrunch nor Similarweb’s own report page states the geography or device mix behind the figure.

The same report puts Google’s AI Mode at 279 million visits in May 2026, up from 126 million in June 2025, and finds that only 6.8% of US desktop ChatGPT queries carried a citation as of May 2026. Together the numbers sketch a search channel that is answering more and referring less — the structural shift we covered in depth in our zero-click data update. This post does not re-argue that thesis; it carries the new Similarweb data, and the denominator questions the coverage skipped.

Below: the headline figures with their scope caveats attached, a side-by-side scorecard of the competing AI-Overviews-presence estimates and the methods behind them, the two ChatGPT metrics everyone is about to conflate, and the measurement changes that follow for marketing teams.

The core finding is stark. Similarweb — the Nasdaq-listed market intelligence firm whose panel data is routinely cited by SEO and marketing trade press — finds that Google’s AI Overviews have gone from appearing in roughly 15% of Google searches to 43% over the past year, per TechCrunch’s July 27 coverage of the firm’s 2026 Generative AI Landscape report. That is a 28-percentage-point expansion of AI-generated answers across Google’s result pages in twelve months.

One caveat belongs glued to that number, and most coverage has skipped it: the denominator is unstated. Neither TechCrunch’s article nor Similarweb’s public report page says whether the 43%/15% pair is US-only or global, desktop or mobile or blended. Similarweb’s own landing page instead headlines a separate, explicitly US-scoped teaser: “>40% of US searches now trigger an AI Overview.” The two figures are close, and they may even be the same measurement — but nothing published confirms that, so we present them as what they are: two adjacent, vendor-reported estimates.

Directionally, the finding is corroborated from outside Similarweb’s panel. Semrush’s Sensor tool — a live SERP-tracking dashboard that observes result pages directly across its own keyword panel rather than modeling traffic — currently reads AI Overviews presence at roughly 48% of the SERPs it tracks. Search Engine Roundtable’s own earlier coverage of this metric had it at about 13% to 20% a year ago, depending on the tracker. Whatever the exact denominator, every independent measurement agrees on the shape of the curve: AI Overviews went from a minority feature to something approaching half of tracked searches in about a year.

Each piece of coverage we reviewed publishes a single number, and none of it puts the competing estimates side by side with their methods named — which is the only way to read this data honestly, because “43% of searches” means something different depending on who counted, what they counted, and how. The scorecard below is our reconciliation: four current estimates and two year-ago baselines, each with its window, stated scope, and measurement method.

Read together, the current estimates cluster between 43% and 48% across at least three independent trackers — Similarweb’s blended traffic panel, Semrush Sensor’s direct SERP observation, and the BrightEdge and Ahrefs coverage tracking reported in our May post. Two fundamentally different instruments sit behind those three readings: panel modeling on one side, direct SERP observation on the other. That convergence is the real story: no single tracker’s denominator is authoritative, but when panel modeling and direct SERP observation independently land in the same band, the underlying trend is hard to dismiss as measurement artifact.

One reconciliation trap worth naming: our own May 17 data update reported a ~48% figure for March 2026 — sourced there to BrightEdge and Ahrefs coverage tracking, and presented as part of a 48-58% range across verticals — that happens to numerically resemble Semrush Sensor’s current ~48% reading. They are different trackers measuring different keyword sets in different months — coincidentally similar, not corroborating each other. Similarly, Similarweb’s method is a multi-source blend — direct measurement, a contributor network of device-level data, algorithmically captured public data, and purchased partner data, per the company’s general methodology page — which is a fundamentally different instrument from a SERP scraper, so its 43% and Semrush’s ~48% should never be averaged or treated as bounds on one true number.

AI Overviews are one of two Google AI surfaces in the report, and the second is growing faster. Google’s AI Mode — the separate, conversational, chat-style search surface — rose from 126 million visits in June 2025 to 279 million by May 2026, per the same Similarweb data via TechCrunch. That is 153 million additional monthly visits, roughly a 2.2× multiple in eleven months, with no geography or device breakdown disclosed for these figures either.

The momentum has an international dimension the report window only hints at: Google brought AI Mode to France on July 22, days before this report’s coverage landed — so the visit curve above was recorded largely before Google’s newest European expansion could contribute to it. Meanwhile the publisher side of this shift is escalating on its own track; some publishers are now openly weighing whether to block Google entirely.

The report’s ChatGPT findings are where sloppy summaries will do the most damage, because TechCrunch’s article contains two different percentages with two different denominators. The first: just 6.8% of US desktop ChatGPT queries included a citation as of May 2026. Both qualifiers matter — the figure is explicitly US-only and desktop-only. TechCrunch notes citation rates grew more than fivefold over the prior year (the article does not state the baseline percentage, so neither will we) — yet even after that growth, more than nine in ten US desktop ChatGPT queries return an answer with no source attached at all.

The second number measures something else entirely: among ChatGPT visits, the share that actually lands on a webpage rose from 25% in March 2026 to 60% by May 30, 2026 — a jump TechCrunch ties to a May 7 ChatGPT search update. That is a visit-level metric about where clicks go when they happen, not a query-level metric about whether a source is shown at all.

TechCrunch’s framing of the report is the cleanest one-line summary of what the numbers mean. The piece describes a shift from an era when Google provided a simple list of blue links to click through and read, to one in which Google itself is the destination — closing with the line that “Google transforms itself from a gateway to the wider web into a destination in its own right.” When AI-generated answers sit on approaching half of result pages and AI Mode adds 153 million monthly visits in under a year, the search engine’s center of gravity has moved from referring attention outward to holding it.

The report’s wider teaser stats — all vendor-stated on Similarweb’s landing page, with no public methodology attached — sketch the same fragmentation from other angles: Claude’s unique visitors reportedly grew about 180% in the second half of the period versus the first, ChatGPT’s usage share is described as declining as Gemini and Claude gain ground, Google search query length is up 5.4% since AI Mode arrived, and 26% of ChatGPT responses are said to now contain ads. Treat each of those as directional vendor color rather than audited findings — but the direction is consistent: the AI-search field is both growing and splintering at once.

Our read on the trend: this is the quarter the “gateway” model of search measurement formally broke. For twenty years the implicit contract was that presence in Google converted to sessions you could count in your own analytics. A 43%-and-climbing AI Overviews rate — whatever its exact denominator — means an expanding share of your search presence now produces impressions and brand exposure on Google’s surfaces that your analytics never sees. Projecting forward, if the past year’s trajectory holds even partially, every tracker’s estimate crosses 50% within quarters, not years — at which point “most searches” include an AI answer and session-based SEO reporting undercounts the channel by design.

TechCrunch’s coverage ends at “Google is a destination now.” It does not tell a marketing team what changes operationally on Monday. Here is our translation of the gateway-to-destination shift into concrete measurement changes — the same reframing we run inside our agentic SEO engagements when a client’s organic sessions and their actual search visibility start telling different stories.

On the instrumentation point: Search Console’s platform properties give sites performance data broken out by surface — the nearest first-party signal for separating classic-search performance from AI-surface exposure as the mix shifts. Pair that with a measurement layer that reconciles first-party analytics against AI-visibility tracking — the stack design work we do in our analytics engagements — and the gateway-to-destination shift becomes something you can actually see in a dashboard rather than infer from declining sessions.