The link between ChatGPT and traditional search just became measurable. A 2026 study from Bocconi University found that when people gained wider access to ChatGPT Search, their weekly traditional search queries fell by 9.4% on average. That gap did not stay small either. After twenty weeks of using the tool, the drop deepened to 17%. If your business depends on Google clicks for leads, that number deserves a hard look.
This is not a survey of opinions or a vendor forecast. Researchers tracked what real people actually did, using desktop clickstream records from more than 45,000 United States households. Below is what they found, why it matters, and the practical moves that keep your brand visible as more searches move inside AI answers.
What the data says about ChatGPT and traditional search
The paper, titled Answering Without Referring: How AI Search Rewrites the Web’s Economic Bargain, came from Bocconi University researchers Qiaoni Shi, Kai Zhu, and Kai Gu. They published the paper on arXiv after analyzing URL level Comscore desktop data from October 2024 through July 2025, a window that captured OpenAI’s staggered rollout of ChatGPT Search to paid subscribers, then free users, then anonymous visitors. That timing is what lets them isolate the real effect of ChatGPT and traditional search behavior side by side.
That staggered launch is what makes the study convincing. Because different groups got access at different times, the researchers could compare people who had ChatGPT Search against near identical people who did not yet have it. The people who gained access searched Google noticeably less, and the effect grew the longer they had the tool.
- 9.4% average drop in weekly traditional search queries after wider access.
- 17% drop after twenty weeks of exposure.
- 8.2% decline even among people who were already ChatGPT users before the search feature expanded.
How much traffic does ChatGPT actually send back to websites?
Here is the part that should worry publishers and service businesses. ChatGPT keeps most of the click. It produces an outbound referral to an outside website in only 5.2% of conversation sessions. Google, by comparison, sends a click out on 31.1% of searches. So even as ChatGPT answers more questions, it passes along a fraction of the traffic that a search engine would. That referral gap is the real story behind the numbers on ChatGPT and traditional search, and separate clickstream research has found the same pattern.
That mirrors a pattern we have watched build for a while, and it is why the way people find answers now matters as much as the keywords they type. If you want a fuller breakdown of that shift, our guide on how AI search is changing SEO strategy for service businesses walks through the tactical side.
| Metric | ChatGPT | Google Search |
|---|---|---|
| Sessions that send a click to an outside site | 5.2% | 31.1% |
| Preferred destinations | Reference, academic, developer and SaaS sites | YouTube, Reddit, Wikipedia |
| Ad supported sites | 27.6 points less likely to refer | Refers freely |
Why informational content took the biggest hit
Not every page loses at the same rate. The study found the steepest declines in informational searches, the kind where someone wants a quick fact or explanation rather than a product. Referrals to academic research fell 32.8%, and referrals to reference material dropped 26.5%.
The logic is simple. When you ask ChatGPT to define a term or summarize a concept, it answers on the spot, so you never click through to a definition page. Content that exists mainly to explain a single fact is the most exposed. Content that helps someone make a decision, compare options, or hire a provider holds up far better, because those searches still push people toward a real choice. The split between ChatGPT and traditional search is widest exactly where the answer is a single fact.
Which sites ChatGPT favors, and which it skips
ChatGPT does not distribute its rare clicks evenly. It leans toward reference sites, academic and developer platforms, and SaaS tools, and it steers away from ad supported publishers, referring to them 27.6 percentage points less often than Google does. Google keeps sending people to YouTube, Reddit, and Wikipedia.
That bias tells you something useful. If your revenue depends on display ads and raw pageviews, the AI shift cuts against you. If you sell a service or a product, the goal changes from chasing pageviews to earning a citation, a mention, or a branded link inside the answer itself.
What this means for your marketing plan
A 9.4% dip is not a collapse, but it is a trend line, not a blip, and it compounds over time. Treat it as an early warning to diversify how people discover you rather than a reason to abandon search. The businesses that get hurt are the ones that assumed Google clicks would keep flowing at the same rate forever. The gap between ChatGPT and traditional search will likely keep widening, so plan for a smaller stream of free clicks.
Two habits protect you. First, keep matching content to real buyer questions instead of high volume keywords that AI now answers for free. Our breakdown of why search intent matters more than keyword volume explains how to make that call. Second, fix the technical gaps that quietly bleed leads, because a smaller pool of clicks makes every one more valuable. If you are unsure where yours leak, start with the technical SEO problems that stop sites from getting leads.
How to earn traffic when AI answers the question
The counterintuitive good news is that the clicks ChatGPT does send tend to convert well, because they arrive from people who already got context and are further along in deciding. You cannot control the trend in ChatGPT and traditional search, but you can control whether AI picks your page as a source. So the play is not to fight AI search, it is to become one of the sources it cites. Focus your effort here:
- Publish content AI can quote. Long guides that answer specific questions, structured comparisons, and FAQ rich pages give models clean passages to pull from.
- Add real data. Original statistics and clear numbers make your page a more useful citation than a vague overview.
- Build third party mentions. Get referenced on the trusted publications and comparison sites that language models draw from, because a mention off your own domain is a strong visibility signal.
- Track it monthly. AI visibility swings fast when models update, so check where you appear at least every 30 days.
This shift also touches how the AI tools themselves change month to month. The recent news that OpenAI set an end date for ChatGPT Atlas is a reminder that the platforms move quickly, and your strategy has to move with them.
Key takeaways
- Wider ChatGPT Search access cut weekly traditional search queries by 9.4%, rising to 17% after twenty weeks.
- ChatGPT refers a click to an outside site in only 5.2% of sessions, versus 31.1% for Google.
- Informational and reference content lost the most, while decision stage content held up better.
- The fix is to earn citations and mentions inside AI answers, not to abandon search.
Frequently asked questions
Is ChatGPT replacing Google search?
Not entirely, but it is taking a measurable share. The Bocconi study showed a 9.4% drop in traditional search queries among people with ChatGPT Search access, growing to 17% over twenty weeks. People still use Google for many tasks, especially transactional ones, so the picture is a split, not a full replacement.
Does ChatGPT send traffic to websites?
Yes, but far less than a search engine. ChatGPT produces an outbound click in about 5.2% of sessions, compared with 31.1% for Google. The traffic it does send tends to be higher intent, so those visitors often convert at strong rates.
How much has AI reduced Google searches?
In this study, wider ChatGPT access reduced weekly traditional search by 9.4% on average, with the effect reaching 17% after twenty weeks of use. Even existing ChatGPT users showed an 8.2% decline once the search feature expanded.
What type of searches does ChatGPT affect most?
Informational searches. Referrals to academic research fell 32.8% and reference material dropped 26.5%, because ChatGPT answers those fact based questions directly. Searches tied to a decision or purchase are less affected.
How can I get my content cited by ChatGPT?
Publish clear, well structured pages that answer specific questions, back them with original data, and earn mentions on trusted third party sites. Then monitor your AI visibility monthly, since model updates can change which sources appear.
The relationship between ChatGPT and traditional search is still young, and the numbers will keep moving. What the Bocconi data makes clear is the direction of travel: AI answers are absorbing the simple, informational searches first, and the clicks that used to be free are getting scarcer. The brands that adjust now, by becoming the source AI trusts rather than the tenth blue link, will keep showing up when their customers go looking.
