Google Analytics has added an automatic channel group “AI Assistant” for traffic from well-known AI chat brokers, Google names ChatGPT, Gemini, and Claude as examples.
GA4 property owners no longer need to create custom channel groups with regex patterns to separate visits from AI assistants and referrals. Until now, all AI chatbot traffic has stayed in the Forwarding bucket by default.
What’s new
The update affects three parts of the traffic source at once.
If Google Analytics finds a referrer that matches a known AI assistant, it assigns “ai-assistant” as the average value. Those sessions are then grouped under the “AI assistant” channel in the Automated Channel Group reports. The scope of the campaign gets the reserved label “(ai-assistant)”.
All three changes happen automatically. Property owners do not need to fix anything.
Google described the update as a way to “oversee how productive AI affects your business by tracking user clicks, trending AI sources, and how this traffic compares to traditional channels like organic search.”
Google has not yet published a full list of known AI assistant directors. The included Help Center mentions ChatGPT, Gemini, and Claude as examples.
Context
Google has been working on this for almost a year. In August, the analytics team published guidance on creating custom channel groups with regex patterns to capture traffic for AI assistants. That guidance named ChatGPT, Gemini, Microsoft Copilot, Claude, and Perplexity as tracking platforms. That marked the point when Google docs started treating AI traffic assistant as a category worth measuring separately.
Custom channel group functionality has limitations. Regex patterns require manual maintenance as AI platforms change domains. Property owners needed planning-level access to set them up. And the two-channel custom teams limit on the GA4 meant devoting one of the two slots available to AI tracking.
This follows the pattern that Google was setting in 2022 when it added “across the network” as an automatic channel group to capture Performance Max and Smart Shopping traffic. That update also moved traffic from the standard bucket to its dedicated channel without requiring manual configuration.
AI traffic measurement has been a recurring measurement challenge. Last year, Google fixed a bug that caused AI Mode search traffic to be reported as “direct” instead of “organic” in GA4 after the noreferrer code stripped referrer headers. Google also adds AI Mode data to Search Console performance reports, although that traffic is aggregated into the overall total instead of appearing as a separate category.
Why This Matters
Anyone using a custom channel group to track AI assistant traffic can simplify that setup as the native channel appears in reports. A native channel may reduce the need for regex patterns and manual channel ordering that Google recommended last year.
Properties that do not have custom AI tracking will begin to see this traffic cut off from forwarding automatically. Sessions that previously appeared as normal referral traffic from chatgpt.com or claude.ai will have their own channel.
One gap to watch is the referrer limit. The AI traffic assistant that comes out of the referrer title still lives in Direct. This can happen with in-app browsers and mobile apps, or when users copy and paste links. The new channel captures only what the GA4 can identify with the transmitter.
Looking Forward
Google has not published which AI assistants are on the list of known referrers beyond the three examples mentioned. It also does not say how the list will be updated as new platforms are introduced. The group’s August 2025 custom channel guidance named five platforms, but the new default system does not specify their full coverage.
The Auto Channel Group description page has not been updated to include “AI Assistant” in its channel table, so a full technical description is not available for review. The custom channel group regex patterns that Google published last year can still include channels that are not on the recognized list of referrers.
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