Check GA4 AI Assistant and Organic Search traffic separately

Which visits belong to AI Assistant?

Google’s default channel help classifies traffic from services such as ChatGPT and Gemini as AI Assistant. This excludes Google AI Overviews and AI Mode; their non-ad search traffic belongs to Organic Search. Default channel rules cannot be edited.

Avoid labeling AI Assistant alone as all AI-related traffic. Record the channels you intend to compare separately. Keep citation counts apart from channel visit figures so you do not combine them as though they measure the same thing.

Should you use session or first-user dimensions?

The same help page defines Session default channel group by the session’s start and First user by the first visit.

To compare visits during the period you are examining, try using session dimensions. Save the dimension name and date range with the table. If an existing table uses first-user dimensions, query the data again with session dimensions before comparing changes.

What else should you examine in the report?

The Traffic acquisition help covers session acquisition. Under Reports > Acquisition > Traffic acquisition, you can add Session source/medium and Landing page for comparison. Menus can vary with report configuration and permissions. This report does not count citations in AI answers.

Use the same scope for these comparisons.

• View AI Assistant and Organic Search over the same date range.
• Record the traffic sources by Session source/medium.
• Use landing pages to choose content to examine next.

What should you check before creating a custom group?

The custom channel help allows groups with separate rules and requires property-level Editor permission or above.

Check the default AI Assistant channel first. Record whether the classification you need is already available, then explain why separate rules are necessary. Do not infer AI traffic from a missing referrer and add Direct to it. Leave traffic sources you cannot verify unverified.

Sources checked: 2026-10-17