Eva Answers / AI shopping and agentic commerce
Did My ChatGPT Traffic Really Drop, or Did It Lose Its Tracking Tag?
Answered by Hai Mag, Founder & CEO, Eva Commerce, with 20+ years in eCommerce transformation, marketplace optimization, and AI-driven automation.
Last reviewed: October 23, 2026
Short answer: Check whether Direct rose on the same pages at the same time. From about October 8 to October 15, 2026, many ChatGPT links lost the utm_source=chatgpt.com tag and sent no referrer, so analytics tools counted those visits as Direct. OpenAI confirmed it was a bug, and a fix began rolling out on October 15, 2026. If your ChatGPT sessions fell while Direct rose on the same landing pages in that window, and tagged ChatGPT sessions recovered after October 15, the visits were relabeled, not lost. Annotate the week instead of changing your attribution model.
What happened in October 2026
Around October 8, 2026, after the GPT-6 rollout, many ChatGPT links stopped carrying the utm_source=chatgpt.com tag and opened without a referrer. With neither signal, analytics tools counted those visits as Direct. Adobe’s Cedric Huesler compared October 9 to 13 with the week before on about 500 pages where ChatGPT drove at least 5% of visits: ChatGPT visits fell by about 31,000 a day while Direct rose by about 26,000 a day on the same pages, and Direct rose on two of every three pages that lost ChatGPT traffic. OpenAI confirmed it was a bug on October 14, and a fix began rolling out on October 15.
Search Engine Journal reported that inline links in answer text lost the tag while links in the Sources panel and shopping links kept it, so the size of the gap depends on how people reach your site from ChatGPT.
Tracking change or real drop? Signs to compare
| Check | Points to a tracking change | Points to a real drop |
|---|---|---|
| ChatGPT sessions (source chatgpt.com or the AI Assistant channel) | Fall sharply from one day to the next, starting around October 8, 2026 | Decline gradually, or keep falling after October 15, 2026 |
| Direct sessions on the same landing pages | Rise by a similar amount at the same time | Stay flat |
| Which pages gain Direct | Deep pages such as blog posts and answer pages, which people rarely type in or bookmark | No unusual Direct growth on deep pages |
| After October 15, 2026 | Tagged ChatGPT sessions recover | Tagged sessions stay low |
How to check your own data, step by step
- Pick the pages that matter. In GA4, open Traffic acquisition, set the dimension to Session source / medium and search for chatgpt. Note the landing pages where ChatGPT was a meaningful share of visits before October 8, 2026.
- Compare the same pages across both weeks. In an Explore report, put Landing page as rows and Session default channel group as columns, then compare October 1 to 7 with October 9 to 14, 2026. Look for AI Assistant down and Direct up on the same pages.
- Check the days after the fix. Compare October 16 onward with the week before October 8. If tagged ChatGPT sessions are back near their old level, the dip was a labeling problem.
- Look at your server logs. OpenAI says ChatGPT may visit a page with the ChatGPT-User agent when a user asks a question. Steady ChatGPT-User requests to the same pages suggest ChatGPT was still using them.
- Annotate October 8 to 15, 2026 in your analytics and reports, and avoid rebuilding your attribution model around that week. Our Shopify attribution guide covers how direct traffic and UTMs work in Shopify reports.
Exceptions
- Both can happen at once. LLM Pulse told Search Engine Journal that aggregated data made it impossible to separate lost traffic from relabeled traffic. A rise in Direct shows relabeling, not that every lost visit was relabeled.
- Small sites see noise. Direct is usually much larger than ChatGPT traffic, so a shift of a few sessions can be hard to see. Compare pages, not site totals.
- Apps rely on the tag. Graphite’s Ethan Smith told Search Engine Journal that 95% of mobile ChatGPT visits to its sites relied on the tag alone, so mobile app traffic is the most exposed when the tag is missing.
In Eva’s own reporting, a ChatGPT drop is only called after comparing ChatGPT and Direct visits on the same landing pages, and October 8 to 15, 2026 is marked as a tracking event.
Follow-up questions
Is the ChatGPT tracking tag back?
According to Search Engine Land, OpenAI confirmed the missing tag was a bug, a fix began rolling out on October 15, 2026, and by 9 a.m. PT that day tagged ChatGPT clicks were back to about 95% to 100% of the previous week, in telemetry covering thousands of domains. Check your own GA4 data for sessions with source chatgpt.com after that date.
Why not track ChatGPT by referrer instead?
Because most ChatGPT clicks still arrive without a referrer, as Search Engine Land reported. The utm_source=chatgpt.com tag, which OpenAI says ChatGPT adds to its links, is the signal to rely on.
How does GA4 decide a visit is Direct?
Google Analytics files a session as Direct when its source is “(direct)” and its medium is “(not set)” or “(none)”. A click with no tracking tag and no referrer looks exactly like that, which is why untagged ChatGPT clicks land in Direct.
Sources
- Search Engine Land: ChatGPT drop in UTM tracking was a bug (October 20, 2026)
- Search Engine Journal: ChatGPT Traffic Drop Appears To Be A Tracking Problem
- OpenAI Help Center: Publishers and Developers FAQ (utm_source=chatgpt.com)
- OpenAI: Overview of OpenAI crawlers (ChatGPT-User)
- Google Analytics Help: Default channel group (Direct and AI Assistant definitions)