To track ChatGPT and AI search traffic in GA4, create a custom channel group with an “AI assistants” channel that matches AI referrers such as chatgpt.com, perplexity.ai, gemini.google.com, copilot.microsoft.com and claude.ai, and place it above Referral. Your AI visits, engagement and leads then show up as their own line in every report.
Key takeaways
- By default GA4 files AI visits under Referral, where they are easy to miss.
- A custom channel group with one regex fixes that in about ten minutes, and it applies to past data too.
- Clicks from Google AI Overviews still count as Organic Search; use Search Console for those.
Step-by-step: create the AI channel
- Open channel groups. In GA4 go to Admin, then Data display, then Channel groups, then Create new channel group. Name it “Channels incl. AI”.
- Add a new channel. Name it “AI assistants”. Set the condition: Session source matches regex (see below).
- Reorder. Drag “AI assistants” above “Referral” so AI visits are classified first, then save.
- Use it in reports. In Reports, then Acquisition, then Traffic acquisition, switch the dimension to your new channel group.
- Mark key events. Make sure form submissions, calls and WhatsApp clicks are key events so you can see AI leads, not just visits.
The regex to use
^(.*\.)?(chatgpt\.com|chat\.openai\.com|openai\.com|perplexity\.ai|gemini\.google\.com|copilot\.microsoft\.com|claude\.ai|deepseek\.com|chat\.deepseek\.com|meta\.ai|you\.com|phind\.com)$Add new AI tools as they appear in your referral list. Review the Referral report monthly for sources you do not recognise.
Want this set up for you?
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What to report every month
| Metric | Where | Why it matters |
|---|---|---|
| AI assistant sessions | GA4, custom channel | Shows whether AI tools are sending visitors |
| AI landing pages | GA4, landing page by channel | Shows which pages AI tools link to |
| AI key events and conversion rate | GA4 | Shows whether AI visitors become leads |
| Citation and mention share | Prompt tracking | Shows visibility that never becomes a click |
| CTR on AI Overview queries | Search Console | Shows the effect of AI summaries on organic clicks |
Limits to keep in mind
- Some AI apps strip the referrer, so part of AI traffic arrives as Direct
- AI Overviews and AI Mode clicks are counted as Organic Search, not as AI
- Many people read an AI answer and later search your brand name: that shows up as branded search, not AI
- Small numbers swing a lot; compare quarters, not days
Frequently asked questions
Does ChatGPT traffic show up in GA4?
Yes, when users click a link in ChatGPT. It usually appears with the source chatgpt.com, often tagged with utm_source=chatgpt.com, and by default lands in the Referral channel.
Why is AI traffic sometimes counted as Direct?
Some apps and browsers strip the referrer, so the visit arrives without a source. This is why AI influence is usually larger than what analytics shows.
Can I track AI Overviews clicks separately in GA4?
No. Clicks from Google AI Overviews and AI Mode come from google.com and are counted as Organic Search. Search Console also groups them with normal web results.
Should AI traffic be its own channel?
Yes. A custom “AI assistants” channel makes the trend visible and lets you compare its conversion rate with other channels.
How much AI traffic is normal?
For most sites it is still a small share of sessions, but it often converts well because visitors arrive with a specific need. Track the trend, not just the total.