I used to be digging via a Google Analytics 4 account not too long ago, broke the site visitors down by supply and medium, and noticed one thing that made me cease scrolling. The identical supply, chatgpt.com, was sitting in three completely different channels without delay. Not three completely different sources. One supply, scattered throughout three channels, in the identical report. Should you’ve received GA4’s new AI Assistant channel, there’s a superb probability the very same factor is going on in your knowledge proper now. And it means the AI site visitors quantity you’re reporting is nearly definitely mistaken.
AI site visitors continues to be a small slice for many websites, nevertheless it converts properly above its weight: Similarweb’s clickstream knowledge has ChatGPT referrals changing at round 7%, forward of natural search and never far behind paid. A high-intent channel that small is price measuring correctly reasonably than eyeballing it. Let me present you why it fragments, and the right way to repair it.
So What Did Google Really Change?
On Might 13, 2026, Google added a local AI Assistant channel to GA4’s Default Channel Group. The thought is straightforward. When GA4 spots a referrer it acknowledges as an AI assistant, it tags the session with the medium ai-assistant, drops it into the AI Assistant channel, and stamps the marketing campaign as (ai-assistant). No setup, no regex, nothing so that you can construct. It rolled out steadily and reached most properties by early June 2026.
Should you spent the final yr stitching collectively customized regex simply to see your AI site visitors, that’s a real win. Earlier than this, these visits sat in Referral, or in Direct when the referrer was lacking.
However right here’s the catch, and it’s hiding within the phrase “acknowledges.” The listing of platforms Google acknowledges retains transferring. At launch, it named ChatGPT, Gemini, and Claude. By June, the dwell documentation listed a special set (ChatGPT, Gemini, DeepSeek, Copilot, and Grok), with Claude quietly dropped. Perplexity, one of many highest-intent AI sources going, nonetheless isn’t on the listing and retains touchdown in Referral. So don’t hard-code a platform listing right into a shopper report. Test Google’s channel definitions on the day you publish, as a result of they alter.
1 Supply, 3 Channels: The Downside Hiding In Your Reviews
Again to that screenshot. The rationale a single supply splits throughout three channels is that GA4 decides the channel utilizing supply and medium collectively, not supply by itself. Add Session supply/medium as a dimension, and you’ll watch chatgpt.com break into three:
chatgpt.com / ai-assistantlands in AI Assistant. That is the slice GA4 acknowledged and tagged.chatgpt.com / referrallands in Referral. These are the classes GA4 didn’t tag, plus something that arrived earlier than the channel switched on to your property (bear in mind, the rollout dragged into June).chatgpt.com / (not set)lands in Unassigned, the channel nearly no one ever opens. Google’s personal rule is blunt right here: when supply/medium comes via as (not set), there’s no channel rule to catch it, so it falls into Unassigned.
Why would a supply you clearly acknowledge flip up with no medium? In my expertise it’s normally the ChatGPT app and its in-app browser. As MarTech has documented, hyperlinks opened inside these embedded browsers are inclined to strip the referrer, so GA4 hangs on to the supply however loses the medium.
So your actual ChatGPT quantity isn’t in a single place. It’s smeared throughout three channels, and considered one of them is a bucket you in all probability by no means examine. Learn the AI Assistant channel by itself, and also you’ll undercount each single time.
Why The Apparent Fixes Don’t Work
There are three instinctive fixes right here, and I wouldn’t lean on any of them:
- Simply learn the AI Assistant channel. It misses the Referral and Unassigned slices of the exact same site visitors, and it ignores Perplexity utterly.
- Examine this month to final. The native channel solely counts ahead from the rollout date, and it switched on at completely different occasions for various properties. So any vary reaching again into spring 2026 is evaluating tagged site visitors towards untagged site visitors. That’s not a pattern; it’s an artifact.
- Test your rank monitoring. Totally different query fully. Rankings inform you about place, not whether or not an assistant really despatched somebody to your web site.
The Repair: 1 Customized Channel That Matches On Supply
Right here’s the transfer that really solves it. Construct a customized channel group and match for supply whereas ignoring medium utterly. The second you try this, the ai-assistant, referral and (not set) variations of chatgpt.com collapse right into a single line.
You get two bonuses on high. A customized channel group applies its guidelines retroactively throughout your entire date vary, so it rescues all these previous ChatGPT classes caught in Referral. And since you’re writing the rule, you possibly can embody the platforms Google leaves out, Perplexity included.
Right here’s how I set it up:
1. Go to Admin > Information show > Channel teams and create a brand new group.
2. Add a channel and name it AI.
3. Set the situation to Supply matches regex, with a sample masking the AI domains.
4. Drag the AI channel above Referral and Natural, so it claims these classes first.
5. Save, then apply the group as your main dimension in any acquisition report.
The regex is the place you possibly can quietly sabotage your self, so construct it rigorously. Maintain entries tied to recognizable domains or service-specific host tokens. By no means throw in a naked token like gpt by itself, as a result of it’ll match any supply that occurs to comprise these three letters and drag in false positives, which is precisely the kind of factor that will get your knowledge picked aside. Right here’s a boundary-aware sample masking the most important AI sources you’d wish to observe:
.*(^|[/.:@?&=])(chatgpt.com|chat-gpt.org|openai.com|perplexity|gemini.google.com|copilot.microsoft.com|edgepilot|edgeservices|claude.ai|deepseek.com|grok.com|you.com|nimble.ai|iask.ai|aitastic.app|bnngpt.com|writesonic.com|copy.ai)([/.:@?=]|$).*Two fast notes on that. gemini.google.com is a particular host, so it gained’t hoover up all of your Google natural, which is precisely why you should by no means add a naked google to the listing. And deal with the sample as perishable. I’d evaluate it each quarter, as a result of platforms come and go and their domains might change.
The Bit Even A Good Channel Can’t Repair
That is the half most guides skip, and it’s the half that retains you sincere. A customized channel group fixes how site visitors is labeled, not whether or not it will get collected within the first place. A supply rule can solely catch classes that confirmed up with a supply it might really learn.
The largest blind spot is AI site visitors with no referrer in any respect, which lands in Direct. Most of that comes from the AI cellular apps and in-app browsers, which cross nothing for GA4 to learn, so there’s no supply to match on.
On high of that, Google’s personal AI Overviews and AI Mode get counted as Natural Search (google / natural), and Google intentionally retains them out of the AI Assistant channel. For lots of web sites, that’s the one greatest AI floor there may be, and it’s invisible as “AI” in your experiences. Don’t attempt to drag it into your AI channel both, otherwise you’ll swallow up strange Google natural by chance.
So, be exact about what you’re claiming. With this practice channel in place, you’ve received a whole and constant quantity for the AI sources you possibly can really establish. What you haven’t received is a measure of whole AI affect. Whether or not an assistant really helpful you to somebody who by no means clicked is a very completely different downside, and no channel group goes to resolve it.
What I’d Do This Week
Deal with the native AI Assistant channel as a place to begin, not the completed product. Then:
- Add Session supply/medium to a Site visitors acquisition report and go on the lookout for your AI domains unfold throughout AI Assistant, Referral, and Unassigned. Actually, seeing the break up for your self is half the lesson.
- Construct the source-based AI customized channel group to drag the fragments again collectively and get better the historical past the native channel left behind.
- Write down a month-to-month baseline. With a transferring platform listing and an enormous darkish slice you possibly can’t see, the month-on-month pattern will inform you excess of any single headline determine.
Google lastly placing AI site visitors on the dashboard is an actual step ahead. Simply keep in mind that the default view arms you the straightforward slice. The precise work now could be understanding precisely which slices it’s quietly leaving out.
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Featured Picture: Roman Samborskyi/Shutterstock
