Google Analytics 4 now has a default channel called AI Assistant, so the first step is to look for it in the Traffic acquisition report. If you want to control which sources count, add a custom channel group matched by session source. Then expect a small number, possibly zero, and read it for what it can't see.
How do you see AI traffic in Google Analytics 4?
Open Reports, then Acquisition, then Traffic acquisition. The table groups visits by the default channel group, and Google added a channel to it called AI Assistant, which it describes as visits from sources like ChatGPT, Gemini, Deepseek, Copilot or Grok. If any assistant sent you visitors, that row is there. If nobody did, the row simply doesn't appear, which is easy to mistake for the channel not existing.
For a second look, change the table's first column to Session source and type the name of an assistant in the search box. That shows you each assistant on its own, which the channel doesn't.
Two limits of the built-in channel are worth knowing. Google matches it against its own list of AI assistants and doesn't publish that list, so you can't check what's in or out. And it leaves out Google's own AI Overviews and AI Mode, on purpose. If you want to decide the list yourself, build your own channel group, below.
Which referrers count as AI traffic?
Only the ones that pass a referrer or tag the link. These are the source values to look for:
| Assistant | Source as it appears in GA4 | Notes |
|---|---|---|
| ChatGPT | chatgpt.com, sometimes chat.openai.com | The most common one on most sites |
| Perplexity | perplexity.ai | Shows up as a normal referral |
| Gemini | gemini.google.com | Only clicks from the Gemini app, not from Google Search |
| Microsoft Copilot | copilot.microsoft.com, sometimes bing.com | Look at bing.com too, but it mixes regular Bing searches |
| Claude | claude.ai | Shows up as a normal referral |
Visits from an assistant's app on a phone often arrive with no referrer at all, and GA4 files those as Direct. Nothing in Analytics can move them back.
How do you build a custom channel group for AI?
It is optional now that the default channel exists, and it takes about ten minutes. It's worth it if you want to choose the sources yourself or add a new assistant the day it appears. You need the Editor role on the property. The steps:
Step 1. Copy the default group. Go to Admin, then Data display, then Channel groups. Open the default channel group and choose to copy it, so you keep every standard channel and only add one. Name it something like "Channels with AI".
Step 2. Add a channel for AI assistants. Click Add new channel, name it "AI assistants", and set one condition: Source, matches regex, with this value:
chatgpt\.com|chat\.openai\.com|perplexity\.ai|gemini\.google\.com|copilot\.microsoft\.com|claude\.ai
Google's own help page has an example regex that starts with ^.*ai. Be careful with it: that piece also matches sources like "mail" and "email", and your newsletter would end up counted as AI.
Step 3. Move it above Referral. Channels are checked from top to bottom and a visit goes to the first one that matches. If AI assistants sits below Referral, it stays empty forever. Drag it up and save.
Step 4. Use it in the report. Back in Traffic acquisition, open the first column's menu and pick your new group instead of the default one.
Step 5. Save the view. Add a comparison or save the report to your library, so next month you open it in one click instead of rebuilding it.
Why does AI Overview traffic show up as organic?
Because it comes from Google Search. When someone clicks a link inside an AI Overview or AI Mode, the visit arrives from google with the medium organic, exactly like a click on a blue link. Google's help page for the AI Assistant channel says so directly: it excludes AI Overviews and AI Mode. GA4 can't tell them apart, and neither can you from Analytics.
Search Console is the closer tool for that part: Google counts AI Overviews and AI Mode inside the regular Web search report, and since this year it also has a separate generative AI performance report. I explain how far it goes in measuring AI Overviews in Search Console.
What does AI referral traffic miss?
Most of what matters. The channel counts people who clicked. It doesn't count:
Answers without a click. An assistant can recommend you by name, and the person calls you or searches your name later. That visit lands as Direct or as a branded Google search.
App visits without a referrer. They go to Direct, as above.
Google's own AI features. They go to Organic Search.
So the number in your new channel is a floor, not a measure of how visible you are in AI answers. If it's zero, it doesn't prove nobody is hearing about you. If it grows, that is real, because every one of those visits came from a link an assistant chose to show.
How much AI traffic does a small site actually get?
I checked this site before writing this. From 1 August to 11 October 2026, Contento's GA4 property recorded 347 sessions from 13 different sources. None of them was an AI assistant.
| Session source | Sessions |
|---|---|
| (direct) | 229 |
| 52 | |
| Instagram, in three variants | 43 |
| menu | 9 |
| Facebook, in two variants | 7 |
| LinkedIn, in three variants | 4 |
| Other | 3 |
| Any AI assistant | 0 |
That is the honest starting point for a young site, and I'd rather show it than a chart that looks better. Two things make the zero less final than it looks: a share of those 229 direct sessions could be app visits with no referrer, and until 3 October some of the direct traffic was my own, because the internal traffic filter wasn't active yet. The AI Assistant channel will show the first one on its own line the day it happens.
If you'd rather know whether your traffic is falling and why, start with how to diagnose a drop in SEO traffic. And if someone else runs your SEO, this channel is one of the things worth asking them about, along with the rest of how to tell if your SEO consultant is working.
Questions I get about this
Do I need Google Tag Manager to track AI traffic?
No. Both the default channel and a custom group work on the data GA4 already collects.
Can I see which pages AI assistants send people to?
Yes. Open the landing page report and filter by the AI Assistant channel, or by your own.
Will this count visits from Google's AI Mode?
No. Those arrive as Google organic, and there is no field in GA4 that separates them.
What I can and can't claim
The table comes from the Traffic acquisition report of Contento's GA4 property, by session source, for 1 August to 11 October 2026, read on 12 October. The site has had data since late August, and the internal traffic filter has been active since 3 October, so earlier direct sessions include some of mine. The AI Assistant channel is described on Google's default channel group help page as of October 2026, which doesn't say when it was added or list the sources it matches. The regex is the one I'd use today; new assistants and new domains appear, so check it every few months. I can't tell you how many people heard about Contento from an AI answer without clicking, and no analytics tool can.
If you want me to set this up on your site and read it with you, that is part of the audit, or you can book a strategic fit call and we'll look at it together.
