How AI search is changing clicks, citations, and content strategy. Sourced and verified
Last updated: July 30, 2026 · Reviewed and refreshed quarterly
Marketers have not agreed upon a term for AI SEO. AEO (Answer engine optimization) and GEO (generative engine optimization) are used interchangeably, both describing the process of optimizing your content to be cited and recommended by chatbots like ChatGPT and Claude. There are no “tried and true” methods yet because the field is so nascent and the landscape is changing. The only certainty is that the adoption of these tools is growing and their impact on marketing will only continue.
How Big Is the Shift?
Love them or hate them, AI Overviews aren’t going anywhere. They appear for about 1 of every 7 or 8 Google searches, and their impact is changing the landscape of organic SEO.
- Google's AI Overviews appeared in 13.14% of all searches as of March 2025, more than double the 6.49% recorded in January 2025, based on an analysis of over 10 million keywords. (Search Engine Land, 2025)
- Zero-click searches — where the user gets an answer without visiting any website — increased from 56% to 69% between May 2024 and May 2025. (Digiday, 2025)
- Pew Research monitored the browsing behavior of 900 US adults in March 2025 and found that click rates on traditional search results dropped to 8% on pages with an AI summary present, compared with 15% on pages without one. (Pew Research Center, July 2025)
- In February 2024, Gartner predicted that traditional search engine volume would drop 25% by 2026 due to AI chatbots and virtual agents. As of mid-2026, that prediction has only partly materialized: AI chatbot usage has grown substantially, but Google still holds roughly 90%+ of the traditional search market, and overall search volume hasn't collapsed the way the headline figure implied. (Gartner, February 2024)
- 91% of marketers report actively using AI in their work, up from 63% last year. As more marketers keep using AI, the more competition AEO/GEO will have. (Jasper, 2026)
- The Gemini App has 950 million monthly active users. (Alphabet Q2 2026 earnings)
- ChatGPT reached 900 million weekly active users in February 2026, up from 400 million a year earlier. (OpenAI)
Click & Traffic Impact
The goal for SEO is simple, try to rank first. For AEO and GEO, it’s much more nebulous. Ranking #1 on Google now is not a guarantee of clicks thanks to AI Overviews. And there’s a rise in “zero-click” results.
- Ahrefs analyzed 300,000 keywords and found that the organic click-through rate for the #1 ranking position fell 58% when an AI Overview appeared on the results page. (Ahrefs, 2026)
- Pew Research's tracked study found users clicked a traditional search result only 8% of the time when an AI summary was shown, compared to 15% when it wasn't. (Pew Research Center, July 2025)
- Bain did a survey and found that about 80% consumers are relying on zero-click results in at least 40% of their searches. This is estimated to have reduced organic traffic by 15-25% (Bain, 2025).
- In that same survey, Bain found that 68% of chatbot users use the tools to research and summarize information, and 42% are asking for shopping recommendations (Bain, 2025).
- Even if you show up in an AI Overview, a survey found that 99% of users who see the AI summary don’t click the cited sources. When an AI Overview is present, users are more likely to just end their Google search (26%) than when an AI Overview is not present (16%). (Pew Research).
What Actually Gets Cited
Just because you rank well on Google doesn’t mean you’ll show up in AI Overviews or get cited by chatbots.
- Researchers from Princeton, Georgia Tech, and IIT Delhi introduced the formal concept of Generative Engine Optimization in a 2024 study, and found that adding statistics and citing credible sources to a passage were among the most effective ways to increase how often that content was referenced in AI-generated answers. (Princeton, Georgia Tech & IIT Delhi, GEO: Generative Engine Optimization, KDD 2024)
- A March 2026 Ahrefs study found that only 38% of AI Overview citations came from pages that also ranked in Google's top 10 organic results for the same query, down from 76% a year before, indicating that ranking position and AI citation are becoming distinct outcomes. (Ahrefs, March 2026, via Radyant)
- Backlinks aren’t the only way to gain authority in AEO/GEO. Brand web mentions correlate roughly three times more strongly with AI Overview visibility than backlinks do, across 75,000 brands studied. (Ahrefs, 2025)
Platform Differences
Chatbots are not all the same, as you’ve likely noticed. They each pull from different indexes and cite different sources. Just because you get traffic from one doesn’t mean you’ll get traffic from the rest.
- A 2026 study of 34,234 AI responses found a 46-times difference in brand citation rates between platforms: ChatGPT cited brands in just 0.59% of responses, Perplexity cited brands in 13.05%, and Grok cited brands in 27%. We could not independently verify the underlying study behind this figure, so we're presenting it as a directional finding rather than a confirmed statistic. (Leapd, April 2026 (source not independently verified))
- It was also found that a prompt with commercial-intent triggers a web search in ChatGPT 53.5% of the time versus 18.7% for informational prompts. This means that citation in ChatGPT still means being visible on Bing (the search engine ChatGPT uses). (Leapd, April 2026 (source not independently verified))
Market Size & Adoption (A Note on Data Quality)
GEO/AEO “market size” and “ROI” statistics are especially unreliable right now. In researching this page, we found single-source claims ranging from a $365 million US GEO market to a $2–5 billion global one, both for the same year, alongside vendor-blog claims like “93% of CMOs see measurable ROI from generative AI” that could not be traced to any named, checkable study. Because this category is new, poorly measured, and full of marketing agencies citing each other, we've chosen not to repeat specific market-size or ROI figures here rather than present numbers we can't stand behind. Treat any single-number GEO market size or ROI claim you see elsewhere with real skepticism until you can trace it to a named, dated source.
Frequently Asked Questions
What's the difference between AEO and GEO?
They are used interchangeably. AEO means Answer Engine Optimization and GEO is Generative Engine Optimization. They both refer to optimization for chatbots like Claude and ChatGPT.
How much do AI Overviews actually reduce clicks?
AI overviews reduced the #1 organic positions click-through rate by 58%, according to Ahrefs. Pew Research found that CTR dropped from 15% to 8% when an AI overview was shown.
Did Gartner's prediction that search volume would drop 25% by 2026 come true?
Only partly, and mostly not in the way the headline suggested. Gartner made the prediction in February 2024. As of 2026, AI chatbot usage has grown enormously, but Google still commands roughly 90% or more of the traditional search market, and overall search volume hasn't collapsed by 25% (Gartner, February 2024). The more accurate read is that search behavior is fragmenting across more tools, not that traditional search is disappearing.
What actually gets content cited by AI search tools?
A research paper found that the best way to get cited was to use statistics and credible sources. (Princeton, Georgia Tech & IIT Delhi, KDD 2024). Ranking in Google's top 10 no longer guarantees a citation in an AI Overview for the same query (Ahrefs, March 2026).
Do ChatGPT, Google AI Overviews, and Perplexity all cite sources the same way?
No, chatbots don’t all cite the same sources. Rather they cite external sources differently. One study says that there was a 46x difference in brand citation between platforms (Leapd, 2026). ChatGPT searches Bing, Gemini searches Google.
A Note on Sourcing
This is one of the least reliable corners of marketing statistics we've researched. A large share of the “GEO statistics” content circulating online traces back to unnamed studies, vendor marketing claims, or numbers that get repeated across dozens of blogs without ever pointing to an original source. We've prioritized figures from named, dated, and independently checkable sources (Ahrefs, Pew Research, Gartner, and the original peer-reviewed GEO research paper) and explicitly flagged the handful of figures we couldn't fully verify rather than omit useful context. We chose not to include several commonly repeated market-size and ROI statistics because we could not trace them to any checkable source. This page is reviewed and refreshed quarterly.
