Semrush says ChatGPT referral traffic surged 206%, reshaping analytics

ChatGPT referral traffic has moved from curiosity to a channel worth tracking in the same dashboards that handle organic search and paid media. Semrush says outbound referral traffic from ChatGPT grew 206% in 2025, based on 17 months of clickstream data, and that the same growth pattern held when it compared January 2025 with January 2026. The bigger story is not just volume. Semrush argues the visits are changing in quality, because many users arrive after doing substantial research inside the AI interface and are further along in the buying process.

That is why the measurement playbook now starts in first-party analytics. Semrush’s guide walks marketers through Google Analytics 4, telling them to filter by session source so chatgpt.com traffic is visible, isolate landing pages, and check engagement and key events instead of stopping at raw sessions. The catch is attribution. AI platforms do not always pass referral information, so some visits get dumped into direct traffic. Google Analytics’ own documentation says direct and none means traffic without a clear referral source, which leaves a real chunk of AI-driven traffic hidden unless teams look carefully.

The competitive angle matters just as much as the traffic count. Semrush’s AI Traffic dashboard is built to compare ChatGPT, Gemini, Copilot, and other assistants, then benchmark where those referrals go and which competitors are winning mentions. In Semrush’s July 2025 analysis, ChatGPT was the platform sending the most traffic to the world’s five largest websites. The same dataset showed more than 30% of ChatGPT referral traffic going to 10 domains, while over 20% went to Google, a sign that AI referrals are concentrated enough to study as a distinct discovery pattern.

The scale explains why this is no longer a side issue. OpenAI said ChatGPT had 700 million weekly active users in July 2025 and more than 800 million weekly users by late 2025. Similarweb put the broader shift in sharper focus, saying AI platforms generated more than 1.1 billion referral visits in June 2025, up 357% year over year. Ahrefs has described ChatGPT traffic as a high-intent channel that can convert more efficiently than traditional search, which lines up with what many marketers are seeing in landing-page behavior.

The practical takeaway is blunt: track AI referrals as a real acquisition source, compare them against competitors, and do not trust the referrer field alone. The metric that matters now is not just whether ChatGPT mentions a brand, but whether those mentions turn into sessions, key events, and revenue.