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How to Track AI Traffic in GA4 (Google Analytics 4)

By: Irina Shvaya | September 11, 2025

Key Takeaways

AI platforms like ChatGPT and Perplexity now send real referral traffic that GA4 lumps under generic Referral unless you separate it out.
Building a custom AI Traffic channel group lets you monitor these visits consistently without filtering reports every single time.
Define channel rules using conditions such as Source equals chatgpt.com or Source equals perplexity.ai to capture AI sources.
Reorder your AI Traffic channel above Referral so those sessions get correctly attributed instead of being absorbed elsewhere.
For a fast one-time check, switch the dimension to Session source/medium and search for terms like chatgpt or perplexity.

With the rise of

AI platforms

like ChatGPT and Perplexity, more businesses are seeing website visits from AI-driven sources. To understand this type of traffic in Google Analytics 4 (GA4), you can set up a custom channel or quickly filter reports.

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Option 1: Build a Custom Channel Group (Best for Ongoing Tracking)

Creating a dedicated channel helps you consistently

monitor AI traffic

without needing to filter it every time.

Open GA4 Admin Settings – In your GA4 property, click the Admin gear icon.
Navigate to Channel Groups – Under the Property column, choose Data Display > Channel groups.
Copy the Default Group – Select the three-dot menu next to Default channel group and click Copy to create new.

Name Your Group – Give it a title such as AI Traffic.

Add a New Channel – Click Add new channel and call it AI Traffic.

Set Rules – Under Conditions, define sources such as:
- Source equals chatgpt.com
- OR Source equals perplexity.ai, etc

Save & Organize – Hit Save Channel, then use the Reorder option to move AI Traffic higher in the list so it doesn’t fall under “Referral.”
Apply Changes – Click Apply and Save Group.
View Results – In Reports > Acquisition > Traffic acquisition, switch the dimension to your new AI Traffic channel to see the data.

Option 2: Quick Filtering in Reports (Fast, One-Time Review)

If you just want to check AI-driven visits without making a permanent setup:

Go to Reports > Acquisition > Traffic acquisition.
Change the Primary Dimension from “Session default channel group” to Session source/medium.
Use the Search Bar to filter with terms like chatgpt or perplexity.

Instantly see which sessions originated from AI tools.

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Frequently Asked Questions

Why doesn't GA4 track AI traffic separately by default?

GA4's default channel grouping was built before AI platforms became major traffic sources, so visits from ChatGPT or Perplexity typically fall under the generic Referral channel. Until Google updates its defaults, you must create a custom channel group or filter reports manually to isolate and measure AI-driven sessions accurately.

How do I build a custom AI Traffic channel group in GA4?

Open GA4 Admin, go to Data Display then Channel groups, and copy the Default channel group. Name your new group AI Traffic, add a new channel, and set conditions like Source equals chatgpt.com or Source equals perplexity.ai. Save the channel, reorder it above Referral, then apply and save the group.

How can I quickly check AI traffic without a permanent setup?

Go to Reports, then Acquisition, then Traffic acquisition. Change the primary dimension from Session default channel group to Session source/medium. Use the search bar to filter with terms like chatgpt or perplexity, and you will instantly see which sessions originated from AI tools without creating any permanent configuration.

Why should I reorder the AI Traffic channel above Referral?

GA4 applies channel rules in order, so if Referral sits higher in the list it can capture AI sessions before your custom rule runs. Using the Reorder option to move AI Traffic higher ensures those visits are attributed to your dedicated channel instead of being absorbed under the broad Referral category.

Which sources should I include when defining AI traffic rules?

Start with the major AI platforms driving visits, such as chatgpt.com and perplexity.ai, using Source equals conditions joined with OR. You can add additional AI tools as they emerge to keep your channel comprehensive, ensuring your AI Traffic group captures the full range of AI-driven referrals to your website.