ChatGPT sends 0.62% of Google organic sessions, study finds
Marie Haynes’ analysis of 100 websites over a 12‑month period, covering more than 145 million GA4 sessions, found ChatGPT referrals accounted for just 0.62% of the sessions that Google organic search generated. Adding traffic from other large language models raised the share to 0.73% of Google organic traffic, not of total site traffic.
Key points
- ChatGPT referrals accounted for 0.62% of Google organic sessions across 100 sites in a year.
- ChatGPT visitors converted at 13.8% versus 3.02% for Google organic, yet Google drove 27× more conversions overall.
- ChatGPT referral traffic stopped growing after August 2025, according to Marie Haynes’ analysis of 145 million sessions.
Among the 55 sites that tracked conversions, 13.8% of visitors arriving from ChatGPT converted, compared with 3.02% from Google organic. Even with the higher conversion rate, Google organic still produced 27 times as many conversions as all LLM referrals combined. The study notes that ChatGPT referral growth stopped growing exponentially after August 2025 and began to decline. Haynes’ report does not disclose the exact reporting dates, industry mix, or how conversions were defined, and it did not measure any changes in Google organic traffic. MarTech, owned by Semrush Inc., includes a disclaimer that the page’s content was written by an employee or paid contractor of Semrush.
ChatGPT sends less than 1% of Google’s traffic
MarTech · 22 October 2026
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