ChatGPT's Missing UTM Tags: Why Your Direct Traffic Jumped

If your Direct traffic rose and your ChatGPT referrals fell in the second week of October, you may not have lost any visitors. Reports say ChatGPT links stopped carrying their `utm_source=chatgpt.com` tag after the GPT-6 release, so analytics tools filed those visits as Direct.

What happened

According to Search Engine Roundtable, OpenAI added UTM tracking to ChatGPT links in June. About a week before 14 October, the tags appeared to disappear, starting with the GPT-6 release.

Cedric Huesler of Adobe explained the likely cause: GPT-6 opens links in a way that sends no referrer and drops the `utm_source` tag. With neither signal, GA4 and similar tools can't tell where the visit came from, so they record it as "(direct) / (none)".

His numbers, from about 500 pages where ChatGPT drove at least 5% of visits, compared 9 to 13 October with the week before:

• ChatGPT visits fell by about 31,000 a day.
• Direct visits rose by about 26,000 a day.
• Search traffic on the same pages fell 7%, in line with the wider trend.

On 15 October Huesler updated his post to say it looked like a bug and that links were being tagged again. Reports differ on whether OpenAI has officially confirmed this, and the cause is not formally explained, so treat it as likely but not certain.

What it means for small businesses

A jump in Direct isn't always good news. Direct is where analytics puts traffic it can't explain. When a source stops sending its tag, Direct rises and the real source looks smaller than it is.

You can't get the history back. Source data that never arrived with the visit can't be recovered later. Annotate the dates in your reports so you don't misread the trend.

Don't change strategy on one metric. If you're deciding whether AI search matters to your business, look at conversions and landing pages, not just the ChatGPT referral line.

What to check now

1. Annotate roughly 8 to 15 October in your GA4 reports, so the dip and the Direct rise have an explanation.
2. Compare Direct and ChatGPT on the same landing pages. If Direct rose on pages that ChatGPT used to send visits to, that's the likely cause.
3. Test a few links in ChatGPT answers to see whether the tag is back.
4. Track enquiries, not only sessions. Our guide to conversion tracking in GA4 shows how to count the actions that matter.
5. Keep bots separate. Crawlers such as ChatGPT-User and OAI-SearchBot are not customers.

If your reports don't add up and you want them sorted, see our performance marketing service or get in touch.