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What’s Changed in Google Analytics?
Google Analytics has quietly rolled out a meaningful update for anyone trying to understand where their website traffic is coming from. A new “AI Assistant” default channel group now automatically captures visits from recognised AI chatbot referrers — separating them from the generic Referral bucket where they’ve been sitting until now.
Google names ChatGPT, Gemini, and Claude as examples of recognised referrers, though it hasn’t published the full list of platforms covered.
This is the kind of update that makes a real difference for business owners and marketers. Until now, if someone clicked a link shared by an AI assistant and landed on your site, that session would appear as a standard referral in your reports — indistinguishable from a blog link or a forum mention. You’d have no way of knowing AI tools were sending you traffic without building your own workaround.
That’s no longer the case.
How Does It Actually Work?
When Google Analytics detects that a visit came from a recognised AI assistant referrer, three things happen automatically:
- The medium is set to
ai-assistant - The session appears under the “AI Assistant” channel in Default Channel Group reports
- The campaign dimension receives a reserved
(ai-assistant)label
All three changes happen without any action from property owners. You don’t need editor access, you don’t need to touch your settings, and you don’t need to free up one of your two custom channel group slots.
Google describes the update as a way to “monitor how generative AI impacts your business by tracking user clicks, trending AI sources, and how this traffic compares to traditional channels like organic search.”
Why Does This Matter for Your Business?
AI assistants are increasingly part of how people discover information — and by extension, how they find businesses like yours. If someone asks ChatGPT for recommendations and clicks through to your site, that’s a real visit from a real potential customer. Knowing it happened, and being able to measure it, is genuinely useful.
If you want to understand how much AI traffic your website is already receiving, we’ve put together a guide on how to track AI traffic free for your website in Australia — worth reading alongside this update.
This change also reflects a broader shift in how Google thinks about traffic measurement. In 2022, Google added “cross-network” as a default channel group to separate Performance Max and Smart Shopping traffic from generic buckets. This AI Assistant update follows the same logic: as new traffic sources become significant enough to measure, Google builds native tracking rather than leaving it to manual workarounds.
What About the Custom Channel Groups Some People Already Built?
Google published guidance in August last year on how to build custom channel groups using regex patterns to capture AI assistant traffic. That guide named ChatGPT, Gemini, Microsoft Copilot, Claude, and Perplexity as platforms worth tracking separately.
That workaround had real limitations:
- Regex patterns needed manual maintenance as AI platforms changed their domains
- Setting them up required editor-level access to your GA4 property
- GA4 only allows two custom channel groups per property — dedicating one slot to AI tracking was a meaningful trade-off
With the native channel now in place, anyone running that custom setup may be able to simplify or remove it. The native channel should handle recognition automatically without the ongoing maintenance.
Is There Anything This Update Doesn’t Catch?
Yes — and it’s worth being aware of.
The new AI Assistant channel only captures traffic that arrives with a referrer header. If a user visits your site from an AI assistant through an in-app browser, a mobile app, or by copying and pasting a link manually, there’s no referrer to detect. That traffic still lands in Direct.
This isn’t a new limitation — it’s how referrer-based attribution has always worked. But it does mean the AI Assistant channel will likely undercount the full volume of traffic coming from AI tools, particularly as more people access ChatGPT and similar platforms through mobile apps rather than desktop browsers.
It’s also worth noting that Google hasn’t published the complete list of recognised AI referrers. ChatGPT, Gemini, and Claude are confirmed examples. Whether platforms like Perplexity, Microsoft Copilot, or others are included isn’t officially documented yet.
What Should You Do Now?
For most GA4 property owners, the answer is: nothing. The channel will appear in your reports automatically.
If you’re running a custom channel group specifically for AI assistant traffic, log into your GA4 property and check whether the native “AI Assistant” channel is now appearing in your Default Channel Group reports. If it is, you can assess whether your custom setup is still adding value or whether it can be simplified.
If you haven’t been tracking AI traffic at all, this is a good moment to start paying attention. Check your Default Channel Group report and look for the AI Assistant channel — even a small volume of sessions is worth understanding, because it tells you whether AI tools are already referring people to your site and what those visitors do when they arrive.
Understanding where your traffic comes from is one of the foundations of any solid SEO strategy. If you’d like help making sense of your GA4 data or want to understand how AI search is affecting your business, get in touch with the team at Local Digital Experts — we’ll take a straightforward look at what the numbers are telling you.
A Quick Summary
| What changed | Detail |
|---|---|
| New default channel | “AI Assistant” — no setup required |
| Medium assigned | ai-assistant |
| Campaign label | (ai-assistant) |
| Named examples | ChatGPT, Gemini, Claude |
| Full referrer list published? | No |
| Traffic without referrer header | Still lands in Direct |
| Custom channel groups needed? | No longer required for basic tracking |