OpenAI tests cross-site tracking in ChatGPT ads
OpenAI is testing an ad tracking mechanism in ChatGPT that behaves like the third-party cookie infrastructure the rest of the ad industry has spent years trying to phase out.
What Was Found
An independent researcher discovered that a cookie associated with ChatGPT can reappear when the same browser later visits websites running OpenAI’s advertising pixel. When that happens, requests sent back to OpenAI can include the same persistent identifier along with page and conversion data.
In plain terms: a user’s ChatGPT session can be linked to their behavior on external sites, enabling cross-site conversion measurement without the user explicitly knowing it is happening.
Why It Matters for Operators
For advertisers, a persistent identifier that ties ChatGPT interactions to downstream purchases is exactly the kind of attribution signal they have been missing. It would make ChatGPT ads measurable in a way that most AI-native placements currently are not.
For users and regulators, it raises the same consent and data questions that have followed third-party cookies for two decades. OpenAI has not publicly detailed the consent framework behind the mechanism.
The Operator Takeaway
If you buy or plan to buy ads on ChatGPT, watch how this develops. Attribution clarity would make the channel easier to justify in a budget. But the regulatory and reputational surface area is real, and OpenAI has not explained what personal data sits behind the identifier or how users opt out.
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