ChatGPT now knows what you do on other websites via ad collector

OpenAI's ad tracking system uses a cookie called __obi that connects user browsing activity across websites to individual ChatGPT accounts. When users visit websites that have installed OpenAI's advertising code, the cookie is sent back to OpenAI along with data about the pages visited, products searched for, and purchase behaviors. A security researcher verified this tracking mechanism across 936 advertiser pixels and confirmed that OpenAI can link users' off-platform web activity directly to their ChatGPT accounts.