Tech article
ChatGPT now knows what you do on other websites via ad collector
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Hacker News | Sep 20, 2026 | lmbbuchodi
Automated excerpt
OpenAI's ad collector at bzr. openai. com sets a cookie called __obi, scoped to . openai. com. Loading that code, sends __obi to OpenAI along with data about the page you are browsing. The identifier becomes a cookie on OpenAI's domain. The client POSTs {"token": "«JWT»"} cross-site to bzr. openai. com/v1/obi/sync.
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