If you run a website for an SME, you’ve probably already noticed: more and more people are landing on your site after asking ChatGPT or Gemini a question. The problem is that, until recently, those visits were lumped together in the «Referral» category in Google Analytics, anonymous and untraceable. That has just changed. The GA4 AI Assistant channel It’s Google’s answer to a question we’ve all been asking ourselves for months: how many people visit my website thanks to artificial intelligence?
According to reports Search Engine Journal, 14 May 2026, Google Analytics 4 has added a new default channel group called «AI Assistant», which automatically separates traffic from recognised AI assistants from other referral sources. No configuration is required. And although it may sound like a minor technical detail, for anyone who wants to understand where their customers are coming from in 2026, this is one of those updates worth keeping a close eye on.
What exactly is the GA4 AI Assistant channel?
The change affects three traffic source dimensions at once. When GA4 detects that a visit comes from a referrer (the source website), which is linked to a well-known AI assistant, does three things automatically, without the property owner having to do a thing:
- Assign «ai-assistant» as the value of the medium (medium).
- Group those sessions under the channel «AI Assistant» in the reports for the default channel group.
- Tag the campaign dimension with a reserved value, «(ai-assistant)».
Google’s own documentation, cited by Search Engine Journal, describes the new feature as a way to «monitor how generative AI impacts your business, by tracking user clicks, trending AI sources and how that traffic compares to traditional channels such as organic search». In other words: you can finally compare AI traffic alongside your organic, direct and paid traffic, and analyse them using the same criteria.
Why this matters to your SME
Until this update, all AI chatbot traffic was automatically categorised under the «Referral» bucket, mixed in with links from blogs, directories and any other websites linking to yours. To view this separately, you had to create a custom channel group using regular expressions (regex), keep it updated every time a platform changed its domain, and, on top of that, GA4 only allows two custom groups: dedicating one of those two slots to AI was a real cost.
Now that traffic is coming in all by itself. And it’s arriving at a time when keeping it hidden is no longer an option. At Vandelay, we’ve been tracking this across real accounts: the AI-generated traffic performs significantly better than other sources, according to the Adobe Analytics data we analysed a few weeks ago. If that channel is performing well but you don’t even know how to measure it, you’re making budget decisions more or less blindly.
Which voice assistants it recognises (and which ones are still unclear)
Here, we need to be honest about what we know and what we don’t. Google has not published the full list of recognised chatbots. Its Help Centre mentions ChatGPT, Gemini and Claude merely as examples. I cannot confirm which others are included, nor how that list will be updated as new platforms emerge.
For reference, in August 2025 Google published a guide to creating custom channel groups which listed five platforms to keep an eye on: ChatGPT, Gemini, Microsoft Copilot, Claude and Perplexity. However, that list was for the old manual method; it does not necessarily correspond to the coverage provided by the new automated system. It’s worth bearing this in mind before assuming that «all» your AI is covered.
The blind spot that nobody should ignore
The AI Assistant channel is good news, but it’s not a silver bullet. It has limitations that completely change how you should interpret the figures:
1. Without referrer, there is no channel. The new group only captures what GA4 can identify via the header referrer. When that header is missing — which is common in in-app browsers, mobile apps or when the user copies and pastes the link — the session is still classified as «Direct». In other words, a significant proportion of your organic traffic will continue to be misclassified as direct, and there is currently no straightforward way to recover it.
2. Google’s own AI is taking a different approach. This distinction is crucial and is easily misunderstood. Traffic coming from the search engine’s own AI features — the AI Overviews and AI Mode— is counted as organic search, not as an AI Assistant. In fact, last year Google fixed a bug that caused traffic from AI Mode to be reported as «direct» rather than «organic». For many businesses, this is probably the biggest source of AI traffic… and it still doesn’t appear labelled as «AI» in the standard report.
3. The data is not backdated. GA4 processes data prospectively. You won’t see this channel populated with your historical data: it will only contain visits that occur after the feature is activated on your property.
This isn’t the first time Google has redirected traffic from a generic ad group to its own channel without asking for permission: in 2022, it did the same when it created the «cross-network» channel for Performance Max and Smart Shopping. The pattern is repeating itself, and it usually means that the category is here to stay.
How to start using it this week
You don’t need a three-month analytics project to get the most out of it. Here are the steps we follow at Vandelay when setting up an account:
- Find the channel. Log in to GA4 at Reports > Acquisition > Traffic acquisition, and check the breakdown by the default channel group. If this feature is already enabled for your property, «AI Assistant» will appear alongside Organic Search, Direct, Referral and Paid.
- Compare – don’t just focus on the figure in isolation. Put AI Assistant alongside your organic and direct traffic. What’s interesting isn’t the raw volume, but the trend and the quality: how do these people compare to the rest?
- Cross-check it with Search Console. The GA4 channel tracks clicks that lead to your website; it does not cover what happens within the search engine. Combine it with the Search Console generative AI report to capture both sides: impressions within the AI and visits originating from it.
- Track your conversions. Make sure that traffic has clearly defined conversion events. If you don’t track forms, calls or sales, the channel will only tell you how many people are visiting, not how many are buying from you.
- Keep a personalised support group. As the list of supported platforms is neither public nor complete, maintain your channel group using regular expressions to capture any that are not included (for example, Perplexity if your property does not support it natively).
Measuring is the first step, not the strategy
It’s worth keeping your expectations in line with reality here. Having a new channel in GA4 doesn’t mean ChatGPT or Gemini will recommend you more. It simply shows you what’s already happening. For those assistants to mention your business, you need to work on your visibility within the generative engines themselves – which is a different ball game to traditional SEO. If you’re interested in that aspect, we cover it in our guide on Generative Engine Optimisation (GEO).
The bigger picture is easy to summarise: AI is already a measurable customer acquisition channel, and from now on you have fewer excuses to ignore it. For an SME in Barcelona competing for local customers, starting to look into this channel this week — even if the volume is still small — is the difference between reacting in time and finding out too late, when the competition has already been optimising for it for months.
Frequently Asked Questions about the GA4 AI Assistant channel
Do I need to configure anything to enable the GA4 AI Assistant channel?
No. According to Google’s documentation, as reported by Search Engine Journal, the channel is assigned automatically when GA4 detects a referrer from a recognised AI assistant. It does not require any configuration by the property owner.
Does traffic from the AI Overviews appear on this channel?
No. Traffic from AI Overviews and the AI Mode in the Google search engine is counted as organic search, not under the AI Assistant channel. This channel primarily captures visits from external chatbots such as ChatGPT or Gemini.
Why do I keep seeing AI traffic under «Live»?
Because when a visitor arrives without a letterhead referrer —which is common in mobile apps, built-in browsers or when copying and pasting a link— GA4 cannot identify its source and classifies it as «Direct». The AI Assistant channel only captures what it can recognise from the referrer.
Sources:
- Matt G. Southern, «Google Analytics Adds AI Assistant as Default Channel Group», Search Engine Journal, 14 May 2026.
- Google, «[GA4] Default channel groups», Google Analytics Help Centre.
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