70% of AI Answers With Multiple Sources Cite the Same Website More Than Once

    In 70% of AI answers that cite two or more sources, one website is cited with two or more different pages. On Gemini and Perplexity the rate passes 91%, and YouTube is the website most often cited several times in one answer.

    Answers with two or more sources that repeat a website by AI engine
    Gemini
    91.7%
    Perplexity
    91.5%
    ChatGPT
    67.6%
    Google AI Overviews
    60.6%
    Google AI Mode
    58%

    Source: Suff Digital analysis of 19,795 AI answers with two or more sources · answers from ChatGPT, Gemini, Perplexity and Google's AI features, September 2026

    Answers citing it two or more times by website
    youtube.com
    16.3%
    wikipedia.org
    3%
    nih.gov
    2.4%
    reddit.com
    2.1%
    microsoft.com
    2.1%
    facebook.com
    1.5%
    google.com
    1.5%
    consumerfinance.gov
    1.4%
    irs.gov
    1.4%
    indeed.com
    1.4%
    amazon.com
    1.3%
    apple.com
    1.2%

    Source: Suff Digital analysis of 19,795 AI answers with two or more sources · answers from ChatGPT, Gemini, Perplexity and Google's AI features, September 2026

    Source: 70% of AI Answers With Multiple Sources Cite the Same Website More Than Once - Suff Digital