Measuring AI traffic in Google Analytics 4: see visitors from ChatGPT

You measure AI traffic in Google Analytics 4 through the AI Assistants channel, which Google added as a default channel in May 2026, plus referrals from sites such as perplexity.ai and claude.ai that do not (yet) always fall under it. The most convenient approach is a dedicated "AI assistants" channel in your channel groups, so all of this traffic appears together in your reports. Bear in mind that you only see part of it: many people read an AI answer and only reach your site later, via Google or directly.

Why measure AI traffic separately?

More and more people ask an AI assistant their question first. If they then click through to your website, you want to know. That shows whether your work on AI visibility also brings in visitors and enquiries.

Since May 2026, Google Analytics 4 has a default AI Assistants channel for well-known assistants such as ChatGPT, Gemini, Copilot and Grok. That is a good step, but it is not complete: Google does not publish a full list, and Perplexity, for example, is still listed under "Referral", among all the other sites that link to you. It gets lost there. With your own channel you can see all AI traffic at a glance.

It also helps with reporting. When management or a client asks what GEO delivers, you can show not only your visibility in AI answers but also how many visitors and enquiries come in via AI assistants. Read more about which numbers to share in GEO KPIs reporting.

Step 1: check whether there is already AI traffic

Start simply. In Google Analytics 4, go to Reports, then Acquisition and Traffic acquisition. First check whether you see the AI Assistants row. Then set the dimension to Session source/medium and look for sources such as:

• chatgpt.com
• perplexity.ai
• gemini.google.com
• copilot.microsoft.com
• claude.ai

If they are there, you are already getting visitors from AI assistants. Sometimes you will also see sources with a tag in the link, such as utm_source=chatgpt.com. That is added to the link by the assistant itself.

Step 2: create a channel for AI assistants

A custom channel group keeps all AI traffic together for good, including Perplexity and Claude. You need admin rights for this.

1. Go to Admin, choose Data display and then Channel groups.
2. Copy the default channel group. You cannot edit the original.
3. Add a new channel called AI assistants.
4. Set the condition: Source matches regex, with this value:

chatgpt\.com|chat\.openai\.com|perplexity\.ai|gemini\.google\.com|copilot\.microsoft\.com|claude\.ai

1. Move the new channel to the top, at least above Referral and AI Assistants. Analytics checks from top to bottom. If another channel comes first, your AI traffic still ends up there.
2. Save. You can now choose the new channel group in your acquisition reports.

New AI services appear regularly. Check every quarter for new sources and add them to the list.

Step 3: link it to results

Visitor numbers alone say little. Also look at what this traffic does:

• Which pages do they land on? These are often pages AI uses as a source.
• How long do they stay and do they view more pages?
• Do they make an enquiry or place an order? Make sure your key actions are set up as key events (conversions).

An online store selling garden furniture might see that visitors from Perplexity mainly land on product comparisons. A museum might see that ChatGPT visitors go straight to the opening hours page. Patterns like these help you decide which pages to improve next.

The limits: you do not see everything

Be honest about what these numbers do and do not tell you:

• Not every click passes on a source. Some apps and browsers do not send a referrer. Those visits end up under "Direct".
• Many people do not click. They read the answer, remember your name and look you up later. That counts as organic search or direct traffic. This is called zero-click. Read more in zero-click search and AI.
• Google AI Overviews and AI Mode are not shown separately. Clicks from them come from google.com and simply count as organic traffic from Google.
• Small numbers. For many businesses, AI traffic is still small. So do not react to every fluctuation.

That is why AI traffic in Analytics complements, rather than replaces, measuring what AI assistants say about you. Read how in how to measure whether AI mentions your business.

Extra signals in Search Console

Also look in Google Search Console at searches for your business name. If they rise while you are mentioned more in AI, that suggests AI answers are sending people your way.

Simply ask

Add the question "How did you find us?" to your contact or quote form, with "ChatGPT or another AI assistant" as one of the options. That way you also see the people who read your name in an AI answer and then found you via Google or directly. That is exactly the group you miss in Analytics.

Frequently asked questions

Can I see which question someone asked ChatGPT?
No. Analytics shows the source, not the question someone asked the assistant.

Does this work retroactively?
In GA4, a custom channel group also applies to earlier data in your reports. Do check this in your own account.

Why don't I see the AI Assistants channel?
It only appears once there are visits from an AI assistant. A custom channel group, as in step 2, also works if you do not see the default channel.

Why am I not seeing any AI traffic?
Perhaps AI rarely mentions you yet, or the traffic is counted as direct. That is why you should also measure your visibility in the answers themselves.

Also measure what AI says about you

Analytics shows who clicks through. Want to know how often ChatGPT, Gemini, Perplexity and Claude mention you, even when nobody clicks? Try the free AI check or follow it every week with GEO tracking.