Last updated: 17 October 2026
Google still holds roughly 89.5% of global search market share as of July 2026, down from 90.91% in 2023, according to StatCounter Global Stats. Meanwhile, ChatGPT's referral share of AI-driven traffic fell to 76.85% in April 2026 as Gemini, Perplexity and Copilot each gained ground, and in the UK specifically, 56% of online adults had used generative AI by 2026, according to Ofcom — showing fragmentation within AI search even as Google's core dominance erodes only slowly.
Key Takeaways
- Google processed 90.1% of worldwide search queries across desktop, mobile, tablet and console in April 2026, with Bing trailing at 5.04%, according to StatCounter Global Stats.
- ChatGPT's share of AI referral traffic dropped to 76.85% in April 2026 from 84.21% a year earlier, while Gemini climbed to 9.0%, Perplexity to 7.73%, Copilot to 3.76% and Claude to 2.66%, per StatCounter Global Stats via Axis Intelligence.
- Google AI Overviews appeared in around 18% of all Google searches in March 2025, with summaries averaging 67 words and typically citing multiple sources, according to Pew Research Center.
- Pages ranking top for keywords with an AI Overview present saw a 34.5% lower average click-through rate than similar keywords without one, based on Ahrefs' analysis of 300,000 keywords.
- In the UK specifically, generative AI use among online adults reached 56% in 2026, up 14 percentage points year-on-year, while Google Search remained far larger overall, used by 82% of UK adults, according to Ofcom.
What is AI search market share?
AI search market share is the proportion of search-related activity — measured by query volume, active users, referral traffic or revenue — that flows through AI-powered tools such as ChatGPT, Google AI Overviews, Perplexity, Microsoft Copilot and Anthropic's Claude, rather than through traditional "ten blue links" search engines. The term covers two distinct things that are often conflated: the competitive split among AI tools themselves, and the smaller but growing slice of all search activity that AI tools now capture.
Traditional search engine market share has been tracked for two decades by firms like StatCounter, which uses tracking code installed on more than 1.5 million websites globally to measure page views by browser and referrer. AI search market share, by contrast, has no equivalent industry-standard methodology yet — a gap that matters when comparing figures from different reports, as later sections explain.
Google's search market share versus AI-native tools
Google is not losing overall search market share quickly, despite the rise of AI-native rivals. Google held approximately 89.5% of the global search engine market as of July 2026, down only around 1.4 percentage points from 90.91% in 2023, according to StatCounter Global Stats. That figure covers all search engine market share, not AI tools specifically — Bing sat at 5.04% in April 2026, with the remainder split across smaller players such as Yahoo and DuckDuckGo, per StatCounter Global Stats.
Google's strategy of embedding AI Overviews directly into its existing results pages, rather than launching a standalone competitor to ChatGPT, appears to be protecting its core market share. Within AI-specific search, however, the picture is more fragmented. ChatGPT's share of AI referral traffic fell to 76.85% in April 2026, its lowest level on record, down from 84.21% a year earlier — while Gemini reached 9.0% and Perplexity 7.73%, according to StatCounter Global Stats via Axis Intelligence.
The scale of Google's position becomes clearer in raw query volume. SparkToro's Rand Fishkin, analysing Datos clickstream data, calculated that Google processed roughly 14 billion searches per day in 2024 against ChatGPT's 37.5 million — a 373x gap. Fishkin's own conclusion was blunt: "My takeaway is that traditional search isn't going anywhere, even for the heavy adopters of AI." Sensor Tower's app-level tracking tells a similar story: ChatGPT's global AI-assistant app share fell below 50% for the first time, to 46.4%, at the end of May 2026, with Gemini climbing to 27.7%, according to Tech Insider.
UK-specific AI search adoption
UK AI search adoption has grown sharply, driven mainly by Google's own AI Overviews rather than by wholesale switching to standalone chatbots. Generative AI use among UK online adults reached 56% in 2026, up 14 percentage points on the prior year, according to Ofcom's Online Nation Report 2026, the UK's communications regulator and the most authoritative domestic source for this data.
The daily audience for generative AI in the UK reached 21% of online adults, around 10.4 million people, up 37% year-on-year. ChatGPT specifically recorded 1.8 billion UK visits in the first eight months of 2026, nearly five times the 368 million visits over the same period a year earlier, with growth accelerating further to 252 million UK visits in August 2026 alone — a 156% year-on-year increase — according to Ofcom's Online Nation 2026 data reported by Mobile World Live.
Despite that growth, Google Search remains the larger service in the UK by a wide margin: it is used by 82% of UK adults, handling around 3 billion searches a month, per Ofcom. Around 30% of UK Google searches now display an AI Overview, and 53% of UK adults say they see these AI-generated summaries often. The practical reading: UK search behaviour is splitting three ways, across Google's traditional results, Google's own AI Overviews, and standalone chatbots led by ChatGPT, and a business invisible in any one of those channels is losing ground it may not be able to see in standard analytics.
How AI search market share is measured
AI search market share is measured inconsistently across the industry, and this drives much of the confusion in reported figures. Three distinct methodologies produce very different numbers for what looks like the same statistic.
The first method tracks referral traffic — the share of clicks arriving at websites that originated from an AI tool, as StatCounter does when comparing ChatGPT, Gemini, Perplexity, Copilot and Claude. The second measures query or usage share — how many prompts or searches go through each platform, typically self-reported by the AI vendors themselves, or estimated via clickstream panels such as SparkToro's. The third estimates market revenue, the basis for Precedence Research's sizing of the global AI search engine market, which put the enterprise segment at 40% share in 2026.
These methodologies rarely align. A tool can command a large share of user queries while generating almost no referral traffic to third-party websites, because AI summaries increasingly answer questions without sending a click anywhere. A figure describing "AI's share of search" sourced from a vendor's self-reported active-user count is not comparable to the same phrase sourced from StatCounter's referral-tracking code, or to Precedence Research's revenue-based market sizing. Businesses comparing reports should always check which of the three a given percentage actually measures before drawing conclusions.
AI search adoption trends over the past 12-24 months
AI search adoption has accelerated sharply since early 2025, primarily through Google's own AI Overviews feature rather than standalone chatbot switching. About 18% of all Google searches in March 2025 triggered an AI Overview, and roughly six-in-ten respondents — 58% — had encountered at least one AI-generated summary in a Google search that month, according to Pew Research Center.
That adoption curve has changed user behaviour measurably. Pew found users clicked through to a traditional web result in just 8% of searches that displayed an AI summary, compared with a 15% click-through rate on searches without one — nearly half the rate, according to Pew Research Center / Search Engine Land.
Within the AI chatbot market specifically, the trend over the past year is toward fragmentation rather than consolidation. ChatGPT's share of AI referral traffic dropped nearly 7.5 percentage points year-on-year, while Gemini, Perplexity, Copilot and Claude all gained share over the same period, per StatCounter via Axis Intelligence. No single challenger has replaced ChatGPT's lost share — the gains are spread across four competitors.
"Faster than any channel we've worked in. Engines ship new models monthly and answers reshuffle with them. That volatility frightens brands, but it's the point: the rankings aren't fossilised yet. This is the window where challengers can still take the shelf." — Lauren Dawkins, Head of Content, Aether AI
Impact on website traffic and click-through rates for UK businesses
AI Overviews reduce click-through rates for UK and global websites alike, and the scale of the drop is now well documented. Analysis of 300,000 keywords found that pages ranking first for a keyword with an AI Overview present saw a 34.5% lower average click-through rate than comparable keywords with no AI Overview, according to Ahrefs.
This matters directly for UK marketing teams budgeting for organic search performance. A business that historically relied on position-one rankings to drive enquiry volume may see materially fewer sessions even while maintaining the same ranking position, because the AI Overview intercepts the click before the user reaches the results list.
For UK organisations tracking GEO — generative engine optimisation, the practice of optimising content to be cited inside AI-generated answers rather than just ranked in blue links — this reframes the KPI. Being cited inside an AI Overview or a ChatGPT answer, even without a click, can still build brand visibility with the buyer at the moment of research, which is why citation rate benchmarks across engines such as ChatGPT, Perplexity, Google AI Overviews, Claude, Gemini and Copilot matter as much as click volume now.
Forecasts for AI search market share over the next five years
Industry analysts project rapid continued growth in the AI search engine market, though forecasts vary by segment and geography. The North America AI search engine market alone is estimated at USD 6.52 billion in 2026 and projected to reach approximately USD 73.78 billion by 2035, a compound annual growth rate of 27.46%, according to Precedence Research.
Enterprise adoption is forecast to remain the largest segment: enterprise search held a 40% share of the global AI search engine market in 2026, per the same Precedence Research analysis, reflecting corporate demand for AI-powered internal knowledge search and customer-facing tools ahead of consumer chatbot use.
The consumer-facing competitive landscape is likely to keep fragmenting rather than consolidate around one winner. With Gemini, Perplexity, Copilot and Claude all gaining referral share from ChatGPT year-on-year — and UK adoption growing in parallel, per Ofcom — UK businesses should plan GEO strategy across multiple engines rather than optimising for a single dominant AI search tool.
Comparing AI search platforms: share and trajectory
| Platform | AI referral share (April 2026) | Change year-on-year | Trajectory |
|---|---|---|---|
| ChatGPT | 76.85% | Down from 84.21% | Declining share, still market leader |
| Gemini | 9.0% | Rising | Gaining fastest |
| Perplexity | 7.73% | Rising | Gaining |
| Copilot | 3.76% | Rising | Gaining |
| Claude | 2.66% | Rising | Gaining |
Source: StatCounter Global Stats via Axis Intelligence, 2026. Figures represent share of AI tool referral traffic, not overall search engine market share.
What AI search trends mean for UK SEO strategy
UK businesses need a dual-track search strategy that covers both Google's traditional results and citation inside AI-generated answers. Traditional SEO metrics such as keyword rankings and organic click-through rate remain relevant — Google still commands 89.5% of global search market share, per StatCounter, and 82% of UK adults still use it, per Ofcom — but the 34.5% click-through drop on AI Overview keywords means ranking first no longer guarantees the traffic it once did.
"A keyword is what someone types into a search box; a prompt is what they actually want, in a full sentence. Tracking prompts forces you to confront the real question set in your market — and most brands discover the questions they answer well are not the ones being asked." — Lauren Dawkins, Head of Content, Aether AI
Content structured with clear definitions, named sources and direct-answer formatting tends to surface more consistently across ChatGPT, Perplexity, Google AI Overviews, Claude, Gemini and Copilot than content written for keyword rankings alone. UK marketing teams should treat GEO and traditional SEO as complementary disciplines, not competing budgets, and monitor citation share across all six major engines rather than organic rank alone. For a practical baseline, see this site's guide to tracking AI search rankings.
Your AI search market share checklist
- Audit which AI engines currently cite your content, using citation tracking across ChatGPT, Perplexity, Google AI Overviews, Claude, Gemini and Copilot.
- Check Google Search Console for click-through rate changes on keywords where AI Overviews now appear.
- Structure key pages with a definition-first opening sentence for every core term and concept.
- Name specific sources, regulators and dates in your content rather than vague industry claims.
- Track referral traffic separately by platform rather than lumping all "AI traffic" into one line item.
- Reassess which KPIs matter — citation visibility now sits alongside click volume as a success measure.
- Review competitor visibility across AI engines quarterly, given how fast platform share is shifting.
- Run a free AI-visibility audit to benchmark current citation performance before setting new targets.
FAQ
What percentage of search traffic goes through AI tools rather than Google?
Google still handled 90.1% of worldwide search across desktop, mobile, tablet and console in April 2026, according to StatCounter Global Stats. AI chatbots represent a smaller, separate category measured by referral share rather than overall search volume, and comparing the two directly is a common source of confusing statistics.
Which AI search tool has the largest market share: ChatGPT, Gemini or Perplexity?
ChatGPT remains the largest by referral share, at 76.85% in April 2026, though that figure is down from 84.21% a year earlier, according to StatCounter via Axis Intelligence. Gemini held 9.0%, Perplexity 7.73%, Copilot 3.76% and Claude 2.66% over the same period.
Do Google AI Overviews reduce click-through rates for websites?
Yes. Users clicked a traditional search result in just 8% of searches with an AI summary present, compared with 15% on searches without one, according to Pew Research Center. Separately, Ahrefs found a 34.5% lower average click-through rate on keywords with an AI Overview across 300,000 keywords analysed.
How many UK adults use AI search tools, and does ChatGPT beat Google in the UK?
No, Google remains far larger in the UK. Generative AI use among UK online adults reached 56% in 2026, but Google Search is used by 82% of UK adults with around 3 billion searches a month, against ChatGPT's 1.8 billion UK visits across the first eight months of 2026, according to Ofcom.
Measuring your own AI search visibility with Aether AI
Market-level statistics only matter once a business knows where its own content stands within that landscape. Aether AI tracks citation performance across ChatGPT, Perplexity, Google AI Overviews, Claude, Gemini and Copilot, so a marketing team can see which engines actually surface their content rather than relying on aggregate market data alone. Across the brands it currently writes and publishes for, Aether AI published 281 articles in the last 30 days.
Businesses wanting to see where they stand across these six engines can run a free AI-visibility audit at /audit, or review Aether AI's public pricing to find the right level of ongoing tracking and content generation.