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

OpenAI's ad collector at bzr.openai.com uses a cookie, __obi, scoped to .openai.com, which is tied to your ChatGPT account. This cookie is sent to OpenAI from other websites you visit. The SDK replaces window.dataLayer.push, reads adobeDataLayer, and parses GTM layers to collect data. Current versions collect email and phone, while version 0.1.31 also collected names and geography before August 27. Advertisers cannot access this __obi cookie or resolve visitors to a ChatGPT identity.

Unlike typical ad trackers, OpenAI's collector uses a first-party cookie from its own domain to track users across the web, rather than relying on third-party cookies.