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In GA4, recognized visits from the Gemini assistant can appear with the ai-assistant medium and in the AI Assistant channel. Unpaid Google Search commonly appears as google / organic and is grouped under Organic Search. Compare session-scoped traffic data in Reports → Acquisition → Traffic acquisition; these labels identify GA4’s observed classification, not every journey influenced by Gemini or generative search.
Where to find Gemini and Google Search traffic in GA4
- Open Reports → Acquisition → Traffic acquisition. This report lets you examine session traffic sources. Google’s example for finding unpaid Google Search visits is to search for
google / organic. Google’s Traffic acquisition report guidance describes that workflow. - Choose a session-scoped dimension. Use Session source / medium to see specific values such as
google / organicorai-assistant. Use Session default channel group to compare broader categories such as Organic Search and AI Assistant. GA4 also offers user- and event-scoped traffic dimensions, which answer different questions. Google’s traffic-source documentation explains the distinction. - Inspect both the detail and the roll-up. Keep source / medium visible when comparing channel totals. A channel combines source and medium into a broader grouping; the source / medium view shows the underlying values.
What the GA4 labels mean
| GA4 label | What it describes | How to interpret it |
|---|---|---|
google / organic |
Google is the source and organic is the medium. |
Commonly indicates unpaid Google Search traffic; it maps to the Organic Search channel. |
ai-assistant medium |
A medium assigned when a referrer matches a recognized AI assistant. | Check source / medium to see the source-level detail; the session is grouped into AI Assistant. |
| AI Assistant channel | A broader channel grouping for traffic with the ai-assistant medium. |
Google names Gemini among the example sources. The channel does not include AI Overviews or AI Mode. |
Google defines source as the specific platform, website, app, or online location that referred a user. Medium describes the traffic type, while a channel groups traffic using source and medium rules. Google’s default channel group definitions list Organic Search and AI Assistant and specify that recognized assistant referrers receive the ai-assistant medium.
Why Gemini referrals are not the same as Google organic search
When a visitor clicks through from a recognized Gemini assistant referrer, GA4 can classify the session as AI Assistant rather than Organic Search. Google’s current channel definition names Gemini as an example AI Assistant source, and its release note dated May 13, 2026 says recognized assistant referrals receive the ai-assistant medium, the AI Assistant channel, and the (ai-assistant) campaign. Google’s release note documents the dedicated measurement.
Google explicitly excludes its AI Overviews and AI Mode from the AI Assistant channel. Those Google Search features are not equivalent to a click from the Gemini assistant app or site. A google / organic session identifies the source and medium GA4 recorded; by itself, it does not show whether the visitor previously encountered an AI-generated feature in Search. Google’s channel definitions state the exclusion.
How to compare the traffic fairly
Use the same date range and session scope for each comparison. The following cuts answer different questions; they are analysis choices, not proof that a source caused a business outcome.
- Session source / medium: Which specific source and medium GA4 recorded for the session?
- Session default channel group: How many sessions were grouped into Organic Search or AI Assistant?
- Landing page: Which pages did those sessions first reach? Compare the same landing-page dimension and date range for both groups.
- Engagement or conversions: Compare only after checking that the relevant events are being collected and that you are using compatible attribution and reporting scopes.
Do not substitute first-user dimensions, which describe original user acquisition, or event-scoped dimensions, which use the property’s attribution model, for session dimensions when the question is how a particular session arrived. Google documents the available traffic-source scopes in its traffic-source dimensions reference.
What a missing Gemini label does—and does not—tell you
The automatic classification depends on GA4 receiving a referrer that matches a recognized assistant. Google’s documentation does not guarantee that every app, browser, or navigation path preserves such a referrer, nor does it offer a complete client-by-client inventory. Therefore, no ai-assistant label does not prove a visitor had no prior Gemini exposure. A recognized assistant referrer supports the narrower statement that the session arrived from a recognized source; it does not prove that source caused a later conversion.
Report what GA4 observed and keep the claim within that scope—for example, “sessions classified as AI Assistant,” rather than “all Gemini-influenced visits.” Google describes the recognized-referrer rule in its channel definitions and AI assistant measurement release note.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to create a custom channel group
For most straightforward comparisons, start with GA4’s built-in AI Assistant channel and session source / medium. A custom channel group is useful when you need a tailored assistant grouping or a rule that differs from the default. Google documents a custom rule using a regular expression over assistant URLs; place the custom AI channel above Referral and, where relevant, Organic Search so it takes precedence. Review the expression as assistant URLs change, and use the custom channel group in acquisition reports. See Google’s custom channel group guidance.
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