AI Search Is Splitting Your Traffic: How to Measure ChatGPT and Perplexity Referrals in GA4

There is a new traffic source growing in your analytics right now, and GA4’s default reports are hiding it inside the referral bucket. Visitors arriving from ChatGPT, Perplexity, Gemini, and Copilot click through when an assistant cites you, and across my client base that stream has roughly quadrupled this year. Small absolute numbers still, but the trend line and the visitor quality demand their own measurement.

Because here is the finding that matters: AI referrals convert at roughly double the site average, consistently, across clients. It makes sense. A visitor arriving from an assistant’s recommendation was pre-sold by the most trusted interface they use. You want to know exactly how many arrive and what they do.

Build the View in GA4, Step by Step

Reading the Numbers Honestly

Once the measurement exists, it changes decisions: the landing page report feeds your content plan, the conversion data justifies AI visibility investment to whoever owns the budget, and the baseline lets you actually evaluate whether citation work, the kind I documented in my AI recommendations research, moves your numbers. Measurement first, then optimisation has something to answer to.