Google's AI search engines are often accused of producing results that diverge significantly from traditional search engine links, and a new study has shed light on just how different they can be. Researchers found that AI-powered search engines tend to cite lesser-known sources, including websites that wouldn't even appear in the top 100 links listed in an organic Google search.
According to the pre-print paper "Characterizing Web Search in The Age of Generative AI," researchers at Ruhr University in Germany and the Max Planck Institute for Software Systems compared traditional link results from Google's search engine to its AI Overviews, Gemini-2.5-Flash, and GPT-4o's web search mode.
The study used a variety of test queries, including specific questions submitted to ChatGPT, general political topics, and products included in the 100 most-searched Amazon products list. The results showed that sources cited by AI-powered search engines were more likely to be from lesser-known sites than those linked in traditional Google searches.
In particular, Gemini search was found to be more likely to cite low-popularity domains, with a median source falling outside Tranco's top 1,000 across all results. This suggests that AI-powered search engines may rely less on well-established sources and more on newer, potentially lower-quality websites.
While the study didn't determine whether AI-based search engines are overall "better" or "worse" than traditional search engine links, it does suggest that they can offer a unique set of benefits. For example, GPT-4o with Search Tool was found to be more likely to cite sources like corporate entities and encyclopedias for their information.
However, the study also highlights some potential drawbacks of relying on pre-trained data. When searching for timely information, AI-powered search engines may struggle to provide up-to-date responses, instead defaulting to messages asking for further information.
The researchers urge future research on "new evaluation methods that jointly consider source diversity, conceptual coverage, and synthesis behavior in generative search systems." As AI search engines continue to evolve, it's clear that they will require careful consideration of their strengths and weaknesses.
According to the pre-print paper "Characterizing Web Search in The Age of Generative AI," researchers at Ruhr University in Germany and the Max Planck Institute for Software Systems compared traditional link results from Google's search engine to its AI Overviews, Gemini-2.5-Flash, and GPT-4o's web search mode.
The study used a variety of test queries, including specific questions submitted to ChatGPT, general political topics, and products included in the 100 most-searched Amazon products list. The results showed that sources cited by AI-powered search engines were more likely to be from lesser-known sites than those linked in traditional Google searches.
In particular, Gemini search was found to be more likely to cite low-popularity domains, with a median source falling outside Tranco's top 1,000 across all results. This suggests that AI-powered search engines may rely less on well-established sources and more on newer, potentially lower-quality websites.
While the study didn't determine whether AI-based search engines are overall "better" or "worse" than traditional search engine links, it does suggest that they can offer a unique set of benefits. For example, GPT-4o with Search Tool was found to be more likely to cite sources like corporate entities and encyclopedias for their information.
However, the study also highlights some potential drawbacks of relying on pre-trained data. When searching for timely information, AI-powered search engines may struggle to provide up-to-date responses, instead defaulting to messages asking for further information.
The researchers urge future research on "new evaluation methods that jointly consider source diversity, conceptual coverage, and synthesis behavior in generative search systems." As AI search engines continue to evolve, it's clear that they will require careful consideration of their strengths and weaknesses.