Answer Engine Optimization Gains as AI Overviews Erode Clicks

Search optimization now has a second goal

For about 25 years, the job of search optimization was to get a page into the top ten blue links. The industry now has another job alongside it: getting a page cited inside an answer generated by Google, ChatGPT, Perplexity or Claude. Practitioners call this answer engine optimization, or AEO. Their guides describe it as earning a citation inside an AI response, where SEO earned a ranking position. The aim moves from winning a click to being the trusted source behind an answer the machine writes13. The term caught on as AI answer features stopped being an experiment and became the normal search experience13.

Google's spring changes made the shift hard to ignore. Around Google I/O in May 2026, the company began its second core update of the year. It also redesigned the Search box, which it called the box's biggest upgrade in more than 25 years, and made Gemini 3.5 Flash the default model in AI Mode1. Google said AI Mode had passed 1 billion monthly users, that queries were doubling every quarter, and that AI Mode searches run about three times longer than traditional ones1. AI Overviews and AI Mode were also combined into one flow. A user can now go from a standard results page with an AI summary straight into a full AI conversation without a separate step2. Industry observers say that design makes it less likely users will click through to sources2.

Clicks are falling. The size of the drop is disputed

Almost everyone agrees that AI summaries reduce clicks to publishers. Estimates of how much vary widely, and the gap matters for strategy.

The best-designed evidence so far is a randomized field experiment by Saharsh Agarwal of the Indian School of Business and Ananya Sen of Carnegie Mellon. They used a browser extension to show or hide AI Overviews for 1,065 desktop Chrome users. When an Overview appeared, outbound organic clicks fell 39.8% and zero-click searches rose 34.5%. Clicks on sponsored results did not change22. Removing the Overview from the top slot raised outbound clicks by 88%, and the effect was concentrated in informational queries22. One finding cuts against a common industry claim. The extra clicks recovered by hiding Overviews were just as engaged as other clicks, which weakens the argument that a smaller stream of AI-filtered traffic makes up for its size with higher quality22. A separate preregistered experiment with about 1,100 participants found that turning off AI Overviews and AI Mode raised publisher click-through rates by about 20%30.

Observational studies produce bigger numbers. Ahrefs found that by December 2025, AI Overviews were linked to a 58% drop in click-through rate for the top-ranked result, up from the 34.5% it reported in April 202527. Pew Research found that users clicked a traditional result 8% of the time when a summary appeared, compared with 15% without one. Only 1% clicked a link inside the summary itself27. At the extreme, DMG Media told the UK's Competition and Markets Authority that click-through on some queries fell by as much as 89% when an Overview appeared21.

The damage at the publisher level is uneven. Chartbeat data covering more than 2,500 news sites showed Google search referrals falling by a third in 20252329. Lifestyle and utility publishers covering weather, TV listings or horoscopes were hit hardest29. An analysis of ten tech and media outlets found their combined US Google traffic fell from 112 million monthly visits at peak to just under 50 million by January 2026. Digital Trends lost about 97%26.

Not every publisher describes a collapse, though. The Daily Mail's SEO director told Press Gazette that the overall effect had not been that severe, even though click-through falls sharply on individual queries where an Overview appears25. Bauer Media found that Overviews cut click-through by about 35% but appeared on only about 30% of searches25. One independent publisher said opinion content holds up relatively well, while explainers and how-to articles are being "eaten up"25.

The likely explanation for the spread is that the per-query effect is large and well established, while the total damage depends on how often Overviews appear and on each publisher's mix of content. That frequency is itself disputed. Estimates range from about 16% of queries in late 202518 to roughly 41% in the field experiment22, and close to half of queries in more recent industry tallies315.

Google's position: AEO is still SEO

Google's public line plays down the idea of a separate discipline. Its May 2026 optimization guide says AEO and GEO (generative engine optimization) are "still SEO." It also says AI Overviews and AI Mode draw on the same index and quality signals as organic results, and that an llms.txt file is not needed14. The guidance favors original perspectives and non-commodity content, and discourages content produced at scale6.

Some data partly supports this. Analysts of the January 2026 core update reported that sites losing organic visibility often lost presence in AI Overviews, AI Mode and third-party AI tools as well. That suggests the two kinds of visibility are not truly separate7.

Other data points the other way. BrightEdge figures cited across the industry show the overlap between AI Overview citations and the organic top ten falling from 76% in mid-2024 to between 17% and 38% by February 2026148. One Ahrefs analysis found that only 8% of ChatGPT citations overlap with Google's top ten14. Authoritas found that about 70% of pages cited in AI Overviews changed within two to three months, and that the changes did not track organic rankings21. That instability helps explain why some sites lose traffic while their blue-link rankings look steady21.

The most reasonable reading is that Google's claim holds as a minimum standard but not as a complete strategy. Being crawlable and indexed with good quality signals gets a page considered for citation. It does not guarantee the page is chosen.

What practitioners are actually changing

The advice across AEO playbooks is similar. Put a direct answer at the top. Use question-shaped headings. Make sure schema markup matches the visible content. Build authority through third-party mentions, not only backlinks1218. Some guides recommend answer blocks of 40 to 60 words and note that AI responses usually cite only three to eight sources. That is a much narrower opening than ten blue links ever were18. The same guide estimates that a brand's own domain tops out at roughly 15% of citations, because language models deliberately draw on a range of sources18. Measurement is changing as well: practitioners now track "share of answer" across sets of prompts instead of rank positions18.

The more measured guides say AEO adds to SEO rather than replacing it, because pages that are poorly crawled or weakly linked will not be cited either1213. Readers should be careful with the business case. Many figures come from vendors who sell AEO tools, such as claims that AI-referred visitors convert 4.4 times better, or that early adopters get 3.4 times more AI visibility14. These are not independent measurements. One vendor's claim that sites relying only on traditional SEO lost 60% of their organic referral traffic comes from its own research16.

Publishers face a harder version of the problem. The Forbes Advisor study found a "citation blind spot": people who saw an AI Overview were less likely to remember where the information came from28. That weakens even the brand-awareness argument often used to justify AEO without clicks. If readers neither click nor remember the source, a citation produces little value for the publisher.

Regulators, lawsuits and Google's concessions

The pressure has moved beyond SEO forums. Penske Media's antitrust suit argues that Google is cannibalizing publisher traffic. The European Publishers Council has filed a complaint with the European Commission2327. Google responded in May with five changes meant to send more traffic to publishers, including a "Further Exploration" section of links and labels for subscription content23. Industry trackers noted that I/O brought no new robots.txt control for opting out of AI Overviews. The UK CMA's push for an opt-out was still unresolved, and Google released no referral figures from its AI surfaces6. The CMA has separately said Google should give publishers clear metrics when their content is used in AI Overviews and AI Mode25.

Publishers are already pulling back. Media leaders surveyed by the Reuters Institute expect search traffic to fall 43% on average over three years, and most plan to put less effort into traditional Google search in 202629.

Where this is heading

AEO is not a fad, and SEO is not dead. Google's own figures show the shift: longer conversational queries, a unified AI flow and agents that monitor the web without the user typing a search110. For brands, AEO is a reasonable change to how they format and promote content. For publishers whose business depends on clicks, it offers little help when one in-page answer can absorb the visit it used to send. The randomized evidence now confirms that AI summaries cause click losses22. What remains unsettled is whether regulators, courts or Google's own concessions will return any of that traffic to the sites the answers are built from.