If your reported ChatGPT traffic dropped on October 9, this is the blog post that will disambiguate the changes in what's happening and why.

At Profound, we’ve been investigating a change in how ChatGPT links to websites through its new Intelligent UI. Most of the links we checked directly in these answers were missing the tracking tags that tell analytics tools where a visitor came from.

Our assessment is that the referral traffic decline is due to this change in how ChatGPT renders links.

People are still being recommended products, clicking through to websites, and making purchases. What’s getting lost is the information that gives ChatGPT credit for sending them.

In our collected responses, the decline in tagged links closely followed the rollout of Intelligent UI. As more answers used the new format, more links appeared without attribution.

What actually changed

With the launch of Intelligent UI, ChatGPT began answering more questions with interactive elements, alongside its familiar text-based responses.

Many of the links in those new answers are missing a small piece of information: utm_source=chatgpt.com.

That might look like an obscure detail at the end of a URL. But it’s what tells an analytics tool, “This person came from ChatGPT.”

Imagine someone asks ChatGPT which running shoes to buy. Your brand gets recommended, they click through to your product page, and they place an order.

The website can still record the visit and purchase. But without the information identifying ChatGPT as the source, the visit may appear as Direct, and ChatGPT’s role in that purchase becomes invisible.

This is the reporting problem marketers are now seeing. It affects Profound’s UTM-based human referral reporting too.

The rollout and the tracking decline line up

We looked at two things over time: how often ChatGPT used Intelligent UI, and how often its answers included tracking tags on cited links.

On October 8, approximately 98% of the answers we collected with citations included at least one tagged source link. That fell to 75% on October 9, then 66% by October 14.

Nearly every answer had some identifiable attribution before the drop. By October 14, roughly a third had none on the cited links we collected.

Intelligent UI went from 2% of our collected answers on October 8 to 26% the following day, reaching approximately 35% by October 14.

Put those trends together and the relationship becomes much easier to imagine.

For a marketer seeing reported ChatGPT referrals fall by roughly a third, that is a meaningful connection. A similar share of answers has moved into a format where many links no longer identify ChatGPT as the source.

The timing and scale are consistent with the referral declines customers have been reporting, and help explain why we believe missing attribution is driving much of the change.

But there are exceptions:

In follow-up checks, we found links rendered after opening an additional product or information panel that still carried tracking tags. A link displayed directly in an answer could be missing its tag, while a link reached further inside the interface still had one.

Attribution can depend on which link a person clicks, even within the same answer. The result is that, in a world where 100% of answers are routed through the Intelligent UI, we still may see some UTM referrals

The bottom line is that the raw citations on ChatGPT did not have the referral UTM, and these are the citations we believe the vast majority of consumers are experiencing.

Why visibility and citations become more important

Since the beginning of the internet marketers have used traffic to understand whether being found was turning into conversions. Someone searched, clicked, arrived on a website, and became part of a report.

With AI search, more of that process happens inside the answer itself: people compare products, learn about companies, and narrow their choices before visiting a website.

Now, even some of the visits that do happen are becoming harder to identify.

This is why visibility and citations will carry more weight.

Visibility tells you whether your brand appears in answers and recommendations, and how often competitors appear alongside or ahead of you. Citations tell you which websites and pages the answer engine chooses to reference.

Together, they help answer questions marketers still need to ask: are we becoming easier to find? Is ChatGPT using our content? Which sources are shaping the answers about our category?

Those measures don’t depend on a tracking tag arriving with a visitor. They don’t replace revenue attribution, but they become incrementally more important when traffic reporting gives you a less complete picture.

Every analytics provider relying on the missing tag faces the same limitation. Changing tools cannot recover source information that was never passed with the visit.

What I would do now

I would expect OpenAI to address this. Attribution helps companies understand the business ChatGPT sends them, and it gives OpenAI credit for that contribution. The fact that tags still appear in parts of the new interface also suggests this is an inconsistency that could be corrected.

But we haven’t seen official communication confirming a fix or timing. Restoring the tags would improve future reporting; it would not automatically recover the missing history.

For now, annotate the change around October 9 and explain it to anyone using those reports to judge performance. Look at overall visits and conversions alongside your visibility and citation trends.

If the ChatGPT referral number is the only thing that suddenly fell, I would not use that alone as a reason to change your strategy. Keep looking at whether your brand is being recommended, whether your content is being cited, and where you have opportunities to improve.

Check out my research on LinkedIn.