GEO & AI search

Organic Search

GA4 channel

Definition

The GA4 default channel for unpaid search clicks. A session lands here when its source is on Google's list of search sites or its medium is exactly "organic". Google's definition says it includes AI Overviews and AI Mode.

Defined in AI Mode Traffic Hides in Organic Search: How to Estimate It.

Where Organic Search comes up

The guides that put this term to work, rather than just defining it.

AI Traffic & AttributionDoes AI-Referred Traffic Convert? What the Evidence Actually Says
AI Traffic & AttributionGA4's AI Assistant Channel: What It Counts, What It Misses, and the Regex for the Rest
AI Traffic & AttributionAI Traffic and Attribution: How to Measure What ChatGPT, Gemini and AI Mode Send Your Store
AmazonTACOS, Not ACoS: The Measurement Shift
AI Traffic & AttributionThe Monthly AI-Attributed Revenue Report: What to Put in It and How to Build It
AI Traffic & AttributionHow to Track ChatGPT Traffic and Revenue on Shopify
Catalog for AICatalog Debt: Measuring What Incomplete Data Costs You
Growth & RetentionLTV Math for Brands Acquired Through AI Channels

Related terms

AI Overviews: The AI-generated summary Google shows at the top of some regular search results pages, with links to the sources it draws on. Search Console treats an AI Overview as a single position on the results page: every link inside it gets that same position.
AI Mode: Google Search's conversational mode, launched in the U.S. on May 20, 2025. Google describes it as using a "query fan-out" technique that breaks a question into subtopics and searches each one. In Search Console, a follow-up question in AI Mode counts as a new query.
AI-attributed revenue: Purchase revenue from sessions whose source GA4 can identify as an AI assistant, using last-click attribution within the session. It excludes purchases influenced by AI answers that arrived through Organic Search, Direct or another channel, so it understates AI's total effect.
AI Assistant channel: A channel in GA4's default channel group for visits from AI assistants such as ChatGPT, Gemini, Deepseek, Copilot and Grok. Its rule is that the medium exactly matches ai-assistant. GA4 sets that medium, and the campaign (ai-assistant), when the referrer matches Google's list of AI assistants. Google says the channel excludes its own AI Overviews and AI Mode.
Custom channel group: A copy of GA4's default channel group that you can edit: add channels, change conditions and reorder them. Traffic goes to the first channel whose definition it matches. Standard properties can have two custom groups, 360 properties five, each with up to 50 channels. Google says custom groups can be applied to reports retroactively.
OpenAI Measurement Pixel: OpenAI's browser SDK for ChatGPT Ads. You install a script, initialize it with a Pixel ID created in the Conversions section of Ads Manager, and call oaiq("measure", ...) when a conversion happens, such as order_created for a purchase.

All 157 terms

What is AI invisibility costing you?

Revenue at risk from AI shopping channels, with the formula shown so you can check the maths.

Open the calculator Commerce GEO