How to Track ChatGPT Traffic in GA4: A Step by Step Setup

This tutorial shows you how to track ChatGPT traffic in GA4 with a custom channel group, which regex to use, and how to read the numbers without overestimating them.

Can GA4 track traffic from ChatGPT?

Yes, GA4 can track ChatGPT traffic, because ChatGPT search links usually carry a recognizable source. OpenAI’s publishers and developers FAQ says ChatGPT automatically includes the UTM parameter utm_source=chatgpt.com in referral URLs, so GA4 records the session source as chatgpt.com.

The catch is where GA4 puts those sessions. In the default channel grouping, chatgpt.com sessions usually land in Referral, mixed with every other website that links to you. You can find them by filtering, but you cannot see AI traffic as one clean line in standard reports. That is what a custom channel group fixes.

Before you start, check that your site actually allows OAI-SearchBot. OpenAI notes that sites allowing its search crawler can track referrals this way, and if your robots.txt or firewall blocks it, you may have very little ChatGPT traffic to measure.

Why does ChatGPT traffic show as direct in GA4?

Some ChatGPT visits show as direct because the browser or app does not pass a referrer and the link may not carry UTM parameters, so GA4 has nothing to attribute the session to. This tends to happen when users copy a URL from an answer and paste it, or when links open from certain desktop or mobile apps.

There is no way to recover those sessions with certainty. What you can do is watch for patterns: if direct traffic to a deep blog post rises at the same time as your chatgpt.com sessions, some of that direct traffic is probably AI driven. Treat your AI channel as a minimum figure, not a full count.

The same applies to other assistants. Perplexity, Gemini, Copilot and Claude send referrers in many cases but not all. Your channel group will capture the visits that are labelled and nothing else.

How do I create an AI channel group in GA4?

You create an AI channel group by copying the default channel group in Admin, adding a new channel with a regex condition on session source, and placing it above Referral. Google’s help page on custom channel groups in GA4 walks through the interface and even includes its own AI assistants example.

1. Open GA4 and go to Admin, then under Data display click Channel groups.
2. Click Create new channel group. GA4 starts you from a copy of the default group.
3. Name it something clear, such as “Channels with AI”.
4. Click Add new channel and name the channel “AI assistants”.
5. Add a condition on Source that matches regex, and paste your pattern (see the table below).
6. Save the channel, then use Reorder to move “AI assistants” above Referral, and above Organic Search if any pattern could overlap.
7. Click Apply, then Save group.
8. Open Reports, then Acquisition, then Traffic acquisition, and switch the primary dimension to your new channel group.

Order matters. Google explains that traffic is included in the first channel whose definition it matches, so if Referral sits above your AI channel, chatgpt.com sessions will never reach it. Standard GA4 properties allow two custom channel groups, and Google says custom channel groups apply to your reports retroactively, so you can see past AI traffic as soon as the group is saved.

Which regex should I use for AI sources?

Use a narrow regex that matches the actual referring domains of AI tools, because a loose pattern can pull in unrelated sources. Google’s own example pattern is broad and matches any source containing words like “gpt” or “ai”, which can misfile sites such as email providers or blogs with those letters in their names. I prefer to start narrow and add sources as they appear in my reports.

After saving, open the Traffic acquisition report, add Session source as a secondary dimension, and check every source in your AI assistants row. If anything looks wrong, tighten the regex. Repeat this check once a quarter, because new assistants and new referrer domains appear regularly.

How can I check ChatGPT traffic without changing settings?

You can check ChatGPT traffic without any setup by opening the Traffic acquisition report and changing the primary dimension to Session source / medium, then searching the table for chatgpt.com. This takes under a minute and is a good way to confirm there is something worth tracking before you build a channel group.

For a more flexible view, use Explore and build a free form exploration with Session source as the row, Landing page as a second row, and Sessions, Engaged sessions and Key events as values. Add a filter where Session source contains chatgpt. You now have a table of the exact pages ChatGPT sends people to, which is the most useful single view of AI referrals.

These quick methods have one weakness: they are easy to forget. A saved channel group shows AI traffic in every standard report automatically, including the ones your team or clients already open each week. That is why I use the quick check to confirm the data exists and the channel group to make it visible.

What should I report each month?

Report AI sessions, engaged sessions, key events and the landing pages they arrive on, because volume alone says little about value. In most sites I track, AI referrals are still a small share of total traffic, but the visitors often land on deep pages and arrive with a specific question already answered.

• Sessions by AI source, month over month.
• Engagement rate compared with Organic Search.
• Key events such as form submissions or purchases from the AI channel.
• Top landing pages for AI traffic, which tell you what AI tools are citing.

The landing page list is the most useful part. It shows which content gets cited, so you can improve those pages and create similar ones. My guide on AEO vs SEO explains how to make those pages even easier to quote, and you can check their search snippets with the SERP snippet preview tool.

What does a finished AI traffic report look like?

If you want AI traffic tracking set up as part of a wider plan, it is included in my GEO services.

Frequently asked questions