# How to Track AI Referral Traffic in GA4

> GA4 has an AI Assistant channel, Search Console reports AI Overview impressions, Bing reports citations. What each shows, and why referral counts are a floor.

Page: https://trylectern.com/blog/track-ai-referral-traffic-ga4

By Edgar Li, October 30, 2026.

You can see part of your AI traffic in three places. GA4 has a default channel for sessions whose medium is `ai-assistant`. Search Console has a report of impressions from Google AI Overviews and AI Mode. Bing Webmaster Tools reports citations in Copilot. None of them shows everything. ChatGPT, Claude and Perplexity offer no webmaster console at all, so what you see in analytics is a floor, not a total.

## Key Takeaways

- [GA4's AI Assistant channel](https://support.google.com/analytics/answer/9756891?hl=en) groups sessions from known AI assistants. It is not retroactive and does not include clicks from Google AI Overviews or AI Mode, which count as Organic Search.
- [Search Console's generative AI report](https://support.google.com/webmasters/answer/16984139) gives impressions from AI Overviews and AI Mode, with no clicks, position or queries.
- [Bing Webmaster Tools](https://blogs.bing.com/webmaster/2026/2/Introducing-AI-Performance-in-Bing-Webmaster-Tools-Public-Preview/) reports citations, cited pages and sampled grounding queries, without clicks or placement.
- Only about 1 to 2.5 percent of visits that followed an AI mention carried an AI referral marker in [one 2026 panel study](https://www.tryprofound.com/blog/the-ai-mention-effect).
- AI referral share varies a lot by population: published figures run from [0.14](https://www.semrush.com/blog/traffic-channel-mix-study/) to [about 1 percent](https://www.conductor.com/academy/aeo-geo-benchmarks-report/) of sessions.

## GA4

Google Analytics added an ["AI Assistant" default channel group](https://support.google.com/analytics/answer/9756891?hl=en). Sessions with a source that GA4 recognises as an AI assistant and the medium `ai-assistant` land there. Check the channel in Reports, then Acquisition, and compare it with Referral and Organic Search.

What to know:

- **Not retroactive.** It starts counting from when it was introduced, so you cannot compare against earlier periods without a custom rule.
- **Clicks from Google's AI surfaces are in Organic Search.** AI Overviews and AI Mode traffic does not appear in this channel.
- **Native apps often send no referrer.** A visit from a mobile app can land in Direct.
- **Link behaviour changed.** [Profound reported](https://www.tryprofound.com/blog/chatgpt-referrals-branded-links) that from 7 May 2026 ChatGPT began linking brand names inside answers, the share of answers with a URL rose from about 4.5 percent to 20 to 24 percent, and referrals to B2B software sites rose more than 200 percent with no change by the sites. A series that crosses that date is not comparable.

If you want your own breakdown, create an exploration with Session source and Session medium, and a filter for known assistant domains. Names change, so check the list periodically.

## Search Console

Google added a [generative AI report to Search Console](https://support.google.com/webmasters/answer/16984139). It gives impressions from AI Overviews and AI Mode. It does not give clicks, click-through rate, position or queries. Use it to confirm your pages appear in Google's AI surfaces, and to see whether presence changes over time.

Two cautions. First, AI Overviews now appear on most branded searches in the US. [One vendor's data](https://ahrefs.com/blog/ai-overviews-on-branded-searches/) put it at 82.91 percent of US desktop results for branded keywords on 29 September 2026, and branded click-through rate in Search Console can step down from such a date with no change in rank. Second, [Google's own data anomalies page](https://support.google.com/webmasters/answer/6211453) says a logging error stopped Search Console reporting impressions accurately from 13 May 2025 until 27 April 2026. Clicks were not affected, but the fix can show up as a drop in impressions, so be careful comparing across that window.

## Bing Webmaster Tools

Bing introduced an [AI Performance report](https://blogs.bing.com/webmaster/2026/2/Introducing-AI-Performance-in-Bing-Webmaster-Tools-Public-Preview/) in February 2026, in public preview, with citations, cited pages and sampled grounding queries. It is the only engine-supplied view of fan-out-style queries. It does not provide clicks or placement.

## What Is Not Available

OpenAI, Anthropic and Perplexity do not offer a webmaster console that reports citations or traffic. The only evidence you have is referral sessions, server logs and your own sampling of answers.

Server logs need care. A logged `ChatGPT-User` fetch is not a citation: in [one Otterly test](https://otterly.ai/blog/geo-experiment-2000-ai-blogs-google-penalization/) it fetched two sites 5,332 times in 90 days for zero citations. Requests blocked at the firewall do not appear in origin logs at all. Crawl volume is not a visibility signal.

## How Big Is It, Really?

Published shares vary with the population.

| Source | Share of sessions | Population |
|---|---|---|
| [Semrush](https://www.semrush.com/blog/traffic-channel-mix-study/), April 2026 | 0.14% | 50,000+ sites, 2025 |
| [Semrush](https://www.semrush.com/blog/manufacturing-seo-ai-search/), September 2026 | 0.48% | Manufacturing sites, Jan to Jul 2026 |
| [Conductor](https://www.conductor.com/academy/aeo-geo-benchmarks-report/), November 2025 | 1.08% | 1,215 customer domains, excluding AIO and AI Mode |

[Profound's panel study](https://www.tryprofound.com/blog/the-ai-mention-effect) (July 2026) suggests the figure is understated: about 1.0 to 2.5 percent of visits that followed an AI mention of a brand carried an AI referral marker. People read an answer, then search for the brand or type the address. [Scrunch (June 2026)](https://scrunch.com/blog/prompt-to-purchase-pipeline-how-ai-influences-buyer-behavior/) found a person-level jump in a Google brand search within a week after an AI recommendation, from 3.28 to 9.24 percent, in an AI-engaged opt-in panel.

So AI referral sessions are a floor. The influence also shows up in branded search and direct visits, which are confounded by PR, ads and seasonality.

## A Practical Setup

1. Turn on the GA4 AI Assistant channel report and annotate 7 May 2026.
2. Add Search Console's generative AI report to your monthly review.
3. If you use Bing, check AI Performance.
4. Track branded search and direct traffic as context, and do not credit them to AI without a comparison.
5. Sample the answers themselves, on a fixed panel, since analytics cannot tell you when you were omitted. See [mention vs citation in AI answers](https://trylectern.com/blog/mention-vs-citation-in-ai-answers).
6. Put the lot in a report with caveats, as in [how agencies report AI visibility to clients](https://trylectern.com/blog/how-to-report-ai-visibility-to-clients).

Lectern measures the part analytics cannot: how often ChatGPT, Gemini, Perplexity and Google AI Overviews name and cite your brand for the questions your buyers ask. See the [pricing page](https://trylectern.com/pricing) for plans, including the free Hobby plan.