{"id":189799,"date":"2025-07-14T04:00:12","date_gmt":"2025-07-14T09:00:12","guid":{"rendered":"https:\/\/ahrefs.com\/blog\/?p=189799"},"modified":"2025-08-26T09:49:49","modified_gmt":"2025-08-26T14:49:49","slug":"ai-overviews-cite-ai-generated-content-more-than-human-writing","status":"publish","type":"post","link":"https:\/\/ahrefs.com\/blog\/ai-overviews-cite-ai-generated-content-more-than-human-writing\/","title":{"rendered":"AI Overviews Cite AI-Generated Content More Than Human Writing"},"content":{"rendered":"\n<div class=\"intro-txt\">AI Overviews are AI-generated content, which means they can contain hallucinations.<\/div>\n\n\n\n<p>Google uses <a href=\"https:\/\/cloud.google.com\/vertex-ai\/generative-ai\/docs\/grounding\/overview\">\u201cgrounding\u201d<\/a> to improve their accuracy, but according to our research, AI Overviews are more likely to cite AI-generated content than human-written content.<\/p>\n\n\n\n<p><\/p><p>Here\u2019s what we&nbsp;found:<\/p><div class=\"intro-tok\" id=\"intro_tok\" style=\"display:none;\"><div class=\"intro-title\">Contents<\/div><a href=\"#\" class=\"expand-dots\"><span><\/span><span><\/span><span><\/span><\/a><\/div><div class=\"post-nav-link clearfix\" id=\"section1\"><a class=\"subhead-anchor\" data-tip=\"tooltip__copielink\" rel=\"#section1\"><svg width=\"19\" height=\"19\" viewBox=\"0 0 14 14\" style><g fill=\"none\" fill-rule=\"evenodd\"><path d=\"M0 0h14v14H0z\" \/><path d=\"M7.45 9.887l-1.62 1.621c-.92.92-2.418.92-3.338 0a2.364 2.364 0 0 1 0-3.339l1.62-1.62-1.273-1.272-1.62 1.62a4.161 4.161 0 1 0 5.885 5.884l1.62-1.62L7.45 9.886zM5.527 5.135L7.17 3.492c.92-.92 2.418-.92 3.339 0 .92.92.92 2.418 0 3.339L8.866 8.473l1.272 1.273 1.644-1.643A4.161 4.161 0 1 0 5.897 2.22L4.254 3.863l1.272 1.272zm-.66 3.998a.749.749 0 0 1 0-1.06l2.208-2.206a.749.749 0 1 1 1.06 1.06L5.928 9.133a.75.75 0 0 1-1.061 0z\" style \/><\/g><\/svg><\/a><div class=\"link-text\" data-anchor=\"Methodology\" data-section=\"methodology\">\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"post-189799-_5eaqcf9icx6\"><\/a>Methodology<\/h2>\n<\/div><\/div><!-- notionvc: c84a884a-630b-43a0-a3ad-5e5bab2b66dd -->\n\n\n\n<p>We took one million SERPs showing AI Overviews from Ahrefs <a href=\"https:\/\/ahrefs.com\/keywords-explorer\">Keywords Explorer<\/a> and extracted the top three cited links. 1.9 million URLs in total, of which we had 500,000 in our database.<\/p>\n\n\n\n<p>We ran each URL through our own AI content detector, which is part of <strong>Page Inspect <\/strong>in <a href=\"https:\/\/ahrefs.com\/site-explorer\">Site Explorer<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1884\" height=\"1312\" src=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/running-my-blog-post-through-ai-content-detector-1.jpg\" alt=\"Running my blog post through AI Content Detector\" class=\"wp-image-189800\" srcset=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/running-my-blog-post-through-ai-content-detector-1.jpg 1884w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/running-my-blog-post-through-ai-content-detector-1-610x425.jpg 610w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/running-my-blog-post-through-ai-content-detector-1-768x535.jpg 768w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/running-my-blog-post-through-ai-content-detector-1-1536x1070.jpg 1536w\" sizes=\"auto, (max-width: 1884px) 100vw, 1884px\"><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Here\u2019s what our content detector found:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>3.6%<\/strong> of pages cited in AI Overviews were categorized as \u201cpure&nbsp;AI.\u201d<\/li>\n\n\n\n<li><strong>8.6%<\/strong> were categorized as \u201cpure&nbsp;human.\u201d<\/li>\n\n\n\n<li><strong>87.8%<\/strong> were categorized as a mix of&nbsp;two.<\/li>\n<\/ul>\n\n\n\n<p>Of the ones that were a mix of both human and&nbsp;AI:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>11.2%<\/strong> showed minimal AI use (1-10% of the page content was categorized as&nbsp;AI)<\/li>\n\n\n\n<li><strong>44%<\/strong> showed moderate AI use (11-40%)<\/li>\n\n\n\n<li><strong>24.7%<\/strong> showed substantial AI use (41%-70%)<\/li>\n\n\n\n<li><strong>7.9%<\/strong> showed dominant AI use (71%-99%)<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1677\" src=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-ai-overviews-are-created-assiste.png\" alt=\"How many pages in AI Overviews are created\/assisted with AI\" class=\"wp-image-189801\" srcset=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-ai-overviews-are-created-assiste.png 1600w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-ai-overviews-are-created-assiste-405x425.png 405w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-ai-overviews-are-created-assiste-768x805.png 768w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-ai-overviews-are-created-assiste-1465x1536.png 1465w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\"><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>These findings become even more striking when compared to our previous research on AI content across the web. In our <a href=\"https:\/\/ahrefs.com\/blog\/what-percentage-of-new-content-is-ai-generated\/\">analysis of 900,000 new pages<\/a>, we found&nbsp;that:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>2.5%<\/strong> of pages were categorized as \u201cpure&nbsp;AI.\u201d<\/li>\n\n\n\n<li><strong>25.8%<\/strong> were categorized as \u201cpure&nbsp;human.\u201d<\/li>\n\n\n\n<li><strong>71.7%<\/strong> were categorized as a mix of the&nbsp;two.<\/li>\n<\/ul>\n\n\n\n<p>Even though this research looked only at new pages (and not all cited URLs in AI Overviews will be new), this suggests that Google\u2019s AI Overviews might show a bias toward citing AI-generated or AI-assisted content compared to the general distribution of content on the&nbsp;web.<\/p>\n\n\n\n<div class=\"sidenote\"><div class=\"sidenote-title\">Sidenote.<\/div> <!-- notionvc: eacaefc4-53ef-41d4-8a9e-379503edf3dd -->No AI content detector is perfect. Like LLMs, AI detectors are statistical models. They deal in probabilities, not certainty. They can be incredibly accurate, but they always carry the risk of false positives. You can learn more about how AI detectors work, and why they\u2019re useful, in these articles:\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><a href=\"https:\/\/ahrefs.com\/blog\/how-do-ai-content-detectors-work\/\">How Do AI Content Detectors Work? Answers From a Data Scientist<\/a><\/li>\n\n\n\n\n<li><a href=\"https:\/\/ahrefs.com\/blog\/whats-the-point-of-ai-detectors\/\">What\u2019s the Point of AI Detectors?<\/a><\/li>\n\n<\/ul>\n<\/div><!-- notionvc: 6fb19bb5-8d77-4340-ab1d-171a569105da -->\n<div class=\"post-nav-link clearfix\" id=\"section1\"><a class=\"subhead-anchor\" data-tip=\"tooltip__copielink\" rel=\"#section1\"><svg width=\"19\" height=\"19\" viewBox=\"0 0 14 14\" style><g fill=\"none\" fill-rule=\"evenodd\"><path d=\"M0 0h14v14H0z\" \/><path d=\"M7.45 9.887l-1.62 1.621c-.92.92-2.418.92-3.338 0a2.364 2.364 0 0 1 0-3.339l1.62-1.62-1.273-1.272-1.62 1.62a4.161 4.161 0 1 0 5.885 5.884l1.62-1.62L7.45 9.886zM5.527 5.135L7.17 3.492c.92-.92 2.418-.92 3.339 0 .92.92.92 2.418 0 3.339L8.866 8.473l1.272 1.273 1.644-1.643A4.161 4.161 0 1 0 5.897 2.22L4.254 3.863l1.272 1.272zm-.66 3.998a.749.749 0 0 1 0-1.06l2.208-2.206a.749.749 0 1 1 1.06 1.06L5.928 9.133a.75.75 0 0 1-1.061 0z\" style \/><\/g><\/svg><\/a><div class=\"link-text\" data-anchor=\"The ouroboros problem\" data-section=\"ouroboros\"><!-- notionvc: 028a8531-8f35-47d5-a575-566a0dd5ae64 -->\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"post-189799-_voewr427bcoo\"><\/a>The ouroboros problem<\/h2>\n<\/div><\/div><!-- notionvc: 508c4d68-3927-4789-88f0-3a8d86caa8bc -->\n\n\n\n<p>We calculated the correlation between AI content percentage and the order of citations in AI Overviews across our entire dataset. <strong>The correlation was 0.017, effectively zero<\/strong>.<\/p>\n\n\n\n<p>This suggests that Google doesn\u2019t explicitly penalize or reward content based on whether it\u2019s human or AI-generated when selecting sources for AI Overviews.<\/p>\n\n\n\n<p>But considering that 87.8% of cited pages are at least AI-assisted, we\u2019re watching AI eat its own tail in real-time. Google\u2019s own AI-generated content is citing other AI-generated content and thus creating a feedback loop.<\/p>\n\n\n\n<p>I don\u2019t think Google is necessarily being careless either. Part of what we\u2019re observing may simply reflect the current state of the web. For example, in our study of 900K pages, we found that <a href=\"https:\/\/ahrefs.com\/blog\/what-percentage-of-new-content-is-ai-generated\/\">74% of new webpages include AI-generated content<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1993\" src=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-are-created-assisted-with-ai.jpg\" alt=\"How many pages are created\/assisted with AI\" class=\"wp-image-189802\" srcset=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-are-created-assisted-with-ai.jpg 1600w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-are-created-assisted-with-ai-341x425.jpg 341w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-are-created-assisted-with-ai-768x957.jpg 768w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-are-created-assisted-with-ai-1233x1536.jpg 1233w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\"><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Google depends on creators for content. But creators are increasingly using AI to create or assist with content creation. For example, in our <a href=\"https:\/\/ahrefs.com\/blog\/marketers-using-ai-publish-more-content\/\">State of AI in Content Marketing report,<\/a> where we surveyed 879 marketers, 87% of respondents use AI to help create content.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1536\" src=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/bar-chart-showing-how-many-marketers-use-ai-to-cre-1.png\" alt=\"Bar chart showing how many marketers use AI to create content\" class=\"wp-image-189803\" srcset=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/bar-chart-showing-how-many-marketers-use-ai-to-cre-1.png 1600w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/bar-chart-showing-how-many-marketers-use-ai-to-cre-1-443x425.png 443w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/bar-chart-showing-how-many-marketers-use-ai-to-cre-1-768x737.png 768w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/bar-chart-showing-how-many-marketers-use-ai-to-cre-1-1536x1475.png 1536w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\"><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>And even though Google\u2019s trying to improve accuracy through retrieval-augmented generation (RAG), we\u2019ve also found that <a href=\"https:\/\/ahrefs.com\/blog\/ai-generated-content-does-not-hurt-your-google-rankings\/\">86.5% of top-ranking pages contain some amount of AI-generated content<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1604\" src=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-the-top-20-search-results-are-cr.jpg\" alt=\"How many pages in the top 20 search results are created\/assisted with AI\" class=\"wp-image-189804\" srcset=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-the-top-20-search-results-are-cr.jpg 1600w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-the-top-20-search-results-are-cr-424x425.jpg 424w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-the-top-20-search-results-are-cr-768x770.jpg 768w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-the-top-20-search-results-are-cr-1532x1536.jpg 1532w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/how-many-pages-in-the-top-20-search-results-are-cr-120x120.jpg 120w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\"><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>This means AI Overviews are drawing from a content ecosystem that\u2019s increasingly AI-generated. We\u2019re potentially witnessing the emergence of an AI content ecosystem where machines talk to machines.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"post-189799-_od3zt9bgm5hn\"><\/a>Start using AI Content Detector<\/h2>\n\n\n\n<p>Ahrefs\u2019 AI Content Detector is part of <a href=\"https:\/\/app.ahrefs.com\/site-explorer\">Site Explorer<\/a>. Just enter any URL, go to <strong>Page inspect<\/strong>, then click on the AI Detector tab.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1392\" height=\"488\" src=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/ai-content-detector.png\" alt=\"AI content detector\" class=\"wp-image-189805\" srcset=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/ai-content-detector.png 1392w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/ai-content-detector-680x238.png 680w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/ai-content-detector-768x269.png 768w\" sizes=\"auto, (max-width: 1392px) 100vw, 1392px\"><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>It\u2019ll tell you what percentage of the content is AI-generated and which LLM was&nbsp;used.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"544\" height=\"914\" src=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/ai-content-level-in-ai-content-detector.png\" alt=\"AI content level in AI content detector\" class=\"wp-image-189806\" srcset=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/ai-content-level-in-ai-content-detector.png 544w, https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/ai-content-level-in-ai-content-detector-253x425.png 253w\" sizes=\"auto, (max-width: 544px) 100vw, 544px\"><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Google uses \u201cgrounding\u201d to improve their accuracy, but according to our research, AI Overviews are more likely to cite AI-generated content than human-written content. Here\u2019s what we&nbsp;found: We took one million SERPs showing AI Overviews from Ahrefs Keywords Explorer and<span class=\"ellipsis\">\u2026<\/span><\/p>\n<div class=\"read-more\">Read more \u203a<\/div>\n<p><!-- end of .read-more --><\/p>\n","protected":false},"author":146,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"wp_typography_post_enhancements_disabled":false,"footnotes":""},"categories":[469,414],"tags":[],"coauthors":[339,467],"class_list":["post-189799","post","type-post","status-publish","format-standard","hentry","category-ai-search","category-data-studies","odd"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AI Overviews Cite AI-Generated Content More Than Human Writing<\/title>\n<meta name=\"description\" content=\"Our research shows Google\u2019s AI Overviews are more likely to cite AI-generated content than human-written pages.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ahrefs.com\/blog\/ai-overviews-cite-ai-generated-content-more-than-human-writing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AI Overviews Cite AI-Generated Content More Than Human Writing\" \/>\n<meta property=\"og:description\" content=\"Our research shows Google\u2019s AI Overviews are more likely to cite AI-generated content than human-written pages.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ahrefs.com\/blog\/ai-overviews-cite-ai-generated-content-more-than-human-writing\/\" \/>\n<meta property=\"og:site_name\" content=\"SEO Blog by Ahrefs\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Ahrefs\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-14T09:00:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-26T14:49:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/running-my-blog-post-through-ai-content-detector-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1884\" \/>\n\t<meta property=\"og:image:height\" content=\"1312\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Si Quan Ong, Xibeijia Guan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@siquanong\" \/>\n<meta name=\"twitter:site\" content=\"@ahrefs\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/ahrefs.com\/blog\/ai-overviews-cite-ai-generated-content-more-than-human-writing\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/ahrefs.com\/blog\/ai-overviews-cite-ai-generated-content-more-than-human-writing\/\"},\"author\":{\"name\":\"Si Quan Ong\",\"@id\":\"https:\/\/ahrefs.com\/blog\/#\/schema\/person\/e09e43a1a939a6723fb3c1ebd243f2e7\"},\"headline\":\"AI Overviews Cite AI-Generated Content More Than Human Writing\",\"datePublished\":\"2025-07-14T09:00:12+00:00\",\"dateModified\":\"2025-08-26T14:49:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/ahrefs.com\/blog\/ai-overviews-cite-ai-generated-content-more-than-human-writing\/\"},\"wordCount\":634,\"publisher\":{\"@id\":\"https:\/\/ahrefs.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/ahrefs.com\/blog\/ai-overviews-cite-ai-generated-content-more-than-human-writing\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/ahrefs.com\/blog\/wp-content\/uploads\/2025\/07\/ai-overviews-cite-ai-generated-content-more-by-si-quan-ong-data-studies.jpg\",\"articleSection\":[\"AI Search\",\"Data &amp; 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