Buchodi's Threat Intel personal blog
ChatGPT now knows what you do on other websites via ad collector
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
- Points
- 764
- HN comments
- 395
- Submissions
- 1
- Cited by
- 0 commenters
Security & PrivacySociety, Policy & Culture2026
On Hacker News
| Submitted | Title on HN | Points | Comments |
|---|---|---|---|
| Sep 20, 2026 | ChatGPT now knows what you do on other websites via ad collector by lmbbuchodi | 764 | 395 |
