How Much Traffic Really Comes from AI Search?
Tomohiro Iida · Published June 25, 2026
How much traffic do AI search tools such as ChatGPT and Perplexity actually send to a website? Rather than guessing, this article publishes primary-source data: Google Analytics 4 (GA4) numbers for netsujo.jp's own site over the past 90 days. We do not inflate the figures — we report exactly what the data shows, with its source. GA4 classifies referral traffic from generative AI services such as ChatGPT, Perplexity, and Gemini under a channel called 'AI Assistant.' Over the past 90 days, that channel accounted for about 1% of all sessions (12 sessions), against roughly 59% from organic search. The number is small, but 9 of those 12 sessions occurred in just the most recent 7 days, which we treat as an early signal of growth rather than a surge. The conclusion: organic search remains the dominant channel, and AI-driven traffic, while still marginal, is worth tracking alongside it.
Key takeaways
- netsujo.jp's own GA4 data shows AI Assistant traffic (the GA4 channel that captures referrals from generative AI tools) at about 1% of all sessions — 12 sessions over the past 90 days, against about 59% from organic search (source: GA4, past 90 days, as of June 25, 2026).
- The number is small, but 9 of the 12 AI Assistant sessions occurred in the most recent 7 days, which we read as an early sign of growth rather than a surge.
- Organic search remains the dominant channel by far. Our conclusion is to keep SEO as the foundation while building out AIO/GEO — AI search visibility and optimization — in parallel.
What GA4's 'AI Assistant' channel actually measures
Before looking at the numbers, it's worth being precise about what is being measured. GA4 added 'AI Assistant' as one of its default channel groupings: referral traffic from generative AI services such as ChatGPT, Perplexity, and Gemini is classified here when a user opens a link that appeared in an AI-generated answer. The classification is based on the referrer domain at the time of the visit — if a user is only mentioned by name in an AI's answer but never clicks through, it never shows up in this channel. The classification is also likely incomplete: depending on the AI service or how a user navigates, AI-driven visits can sometimes be counted under Direct or Referral instead. The honest way to read the 'AI Assistant' figure, then, is as a lower-bound estimate of AI-driven traffic, not a precise total.
The numbers: session share by channel
| Channel | Sessions | Share |
|---|---|---|
| Organic Search | 1,208 | About 59% |
| Direct | 675 | About 33% |
| Referral | 102 | About 5% |
| Organic Social | 34 | About 2% |
| Unassigned | 21 | About 1% |
| AI Assistant | 12 | About 1% |
Source: GA4 (property 382871067), past 90 days, as of June 25, 2026. Shares are rounded and may not sum to 100%. Site-wide, the period recorded 2,052 sessions and 1,626 users. Organic search is clearly the leading channel, followed by direct traffic; AI Assistant sessions are a small fraction of the total. But the 12 AI Assistant sessions are not evenly spread — 9 of them landed in just the most recent 7 days, meaning most of the 28-day total is concentrated very recently. We describe this as an early sign of growth, not a surge, because the absolute numbers are still small and a few weeks of observation isn't enough to call a trend.
How we are interpreting this data
- Organic search is still the main driver. About 59% of sessions over the past 90 days came from organic search — regardless of how much attention AI search gets, it remains by far the largest source of traffic on our site, and SEO fundamentals continue to carry the bulk of it.
- AI-driven traffic is still small, but growing at the margins. AI Assistant sessions are just 12 out of roughly 2,052 over 90 days — about 1% — but the concentration in the most recent week is a signal worth watching. We deliberately avoid calling this a 'surge': the point of publishing primary data is not to inflate a small number.
- This is why we treat SEO and AIO/GEO (AI search visibility and optimization) as two tracks to run in parallel, not a choice between them. SEO is still the primary channel and deserves no less investment, while the emerging AI channel is real enough to track and build for on the same foundation of accuracy and structure.
Related work on being cited by AI
This article focuses only on the traffic data. The concrete steps we've taken to try to grow that AI-driven traffic — structured data, factual consistency, answer-first writing, and an llms.txt file — are covered in a separate series of articles: our own practical log of SEO/AIO work, an explainer on what Generative Engine Optimization (GEO) means, a guide to writing an llms.txt file, and an article on common reasons sites are not cited by AI. This article is the primary-source data that those efforts are aimed at moving.