Why this traffic is easy to miss
A click from inside a chat app behaves like a normal link click once it lands on your site -- the browser sends a referrer header naming the assistant's domain, and your analytics tool records it exactly like a link from any other website. The traffic is not invisible; it is just easy to overlook because it currently arrives in small numbers mixed in with everything else labelled "referral," and because most people are not yet looking for it by name.
Where to look in your reports
Check your Traffic acquisition or Referrers report for these source domains, which cover the assistants currently capable of citing and linking to live web pages:
- chatgpt.com and chat.openai.com -- ChatGPT's search and browsing features
- perplexity.ai -- Perplexity's cited answers
- copilot.microsoft.com -- Microsoft Copilot
- gemini.google.com -- Google Gemini
Any of these appearing as a source alongside a medium of "referral" is an AI assistant sending you a real visitor, not a crawler indexing your site for training (that traffic shows up in server logs, not in a JavaScript-based analytics report, because crawlers do not execute the tracking script).
How big is this traffic, really?
Growing quickly, but still a minority channel for most sites. Semrush's analysis of 17 months of clickstream data found that outbound referral traffic from ChatGPT grew 206% over 2025. Despite that growth rate, AI platforms combined were still driving only a small share of overall traffic across the industries Semrush and other researchers tracked through 2025 and into 2026 -- enough to watch, not yet enough to restructure a reporting dashboard around. The size of the channel also varies a lot by site: content that directly answers specific questions tends to get cited and clicked far more than product or service pages.
Where this traffic does show up, it can convert well. An analysis covered by Search Engine Land, looking at a full year of 2025 data across 94 ecommerce brands, found ChatGPT-referred traffic converting at 1.81% versus 1.39% for non-branded organic search, a 31% higher conversion rate for the AI-referred visitors. As Semrush's Brenna Kelly put it in the firm's research on the shift: "For marketers and content creators, this data reveals an emerging reality: success in this new landscape requires a shift from traditional SEO metrics toward content that actively supports learning, problem-solving, and creative tasks."
Tag your own links so nothing gets lost
Referrer data depends on the assistant actually sending one, which is not guaranteed for every platform or every link format. Where you control the link, such as a profile bio, a citation you submit, or content specifically written to be quoted by an assistant, add a UTM so the source survives even if a referrer header does not: utm_source=chatgpt&utm_medium=ai-assistant. See our complete guide to UTM parameters for the full naming convention, and keep "ai-assistant" as its own medium value rather than folding it into "referral" or "social," so it is easy to isolate later as the channel grows.
What to do with the number once you can see it
Treat it the way you would any new, still-small channel: watch the trend line more than the absolute number for now, check what pages it lands on (usually your most specific, question-answering content), and compare its conversion behaviour against your other sources the way we cover in tracking conversions without cookies. A channel that is 1-2% of traffic today but compounding by triple digits a year is worth a recurring glance, even before it is worth a dedicated strategy.