LLM Traffic

How to Track AI Referral Traffic in GA4 2026

GA4 added a native AI Assistant channel in May 2026, so ChatGPT and Gemini visits now split out of Referral on their own. But Perplexity is missing from Google's published list, AI Overviews still file as Organic Search, and referrer-less visits still hide in Direct. Here is what the free channel catches, what it misses, and when a custom channel group is still worth building.