---
format: "aidr-story-markdown/v1"
id: "7362b503eb6d7f07259ebbd0f321332680d206ec052570f41358068a2c91e325"
canonical_url: "https://aidr.today/7362b503?lang=en"
title: "ChatGPT now knows what you do on other websites via ad collector"
lang: "en"
requested_lang: "en"
available_langs: ["en","vi"]
translation_fallback: null
fallback_fields: []
published_at: "2026-09-20T17:43:10.000Z"
category: "Products"
topics: ["openai","gpt","privacy","tracking","ads"]
source_urls: ["https://www.buchodi.com/chatgpt-now-knows-what-you-do-on-other-websites-via-ad-collector/","https://lobste.rs/s/jbnmj9/chatgpt_now_knows_what_you_do_on_other"]
summary: "OpenAI's ad collector at bzr.openai.com sets a cookie called __obi, scoped to .openai.com. The value is while you are on ChatGPT and tied to your ChatGPT account. __obi is then sent to OpenAI from ordinary websites you visit. Any company that buys ads on ChatGPT installs"
---

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

> [Open the canonical story](<https://aidr.today/7362b503?lang=en>)

**Published:** 2026-09-20T17:43:10.000Z
**Category:** Products
**Topics:** openai, gpt, privacy, tracking, ads

## Summary

OpenAI's ad collector at bzr\.openai\.com sets a cookie called \_\_obi, scoped to \.openai\.com\. The value is while you are on ChatGPT and tied to your ChatGPT account\. \_\_obi is then sent to OpenAI from ordinary websites you visit\. Any company that buys ads on ChatGPT installs

## Sources

- [Story source](<https://www.buchodi.com/chatgpt-now-knows-what-you-do-on-other-websites-via-ad-collector/>)
- [Discussion](<https://lobste.rs/s/jbnmj9/chatgpt_now_knows_what_you_do_on_other>)