ChatGPT is supposed to be a private-feeling tool, but security researchers say a new cookie could link your AI chats to the rest of your browsing. If true, that shifts OpenAI closer to classic ad-tech behavior. Researchers report chatgpt.com sets a 1-year, cross-site cookie called “__obi,” then sends it on requests to advertiser and e-commerce sites using OpenAI’s ad pixel. The claim went viral on Hacker News, with critics comparing it to Meta/Google-style tracking—except the starting point is your conversations. We break down what the cookie does, what it could enable, and what you can do right now to reduce exposure. New AI news every weekday — subscribe so you don't miss tomorrow's story.

Referenced Links:
Catch up on AI — 2026-09-21 (Explainx)
Hacker News (discussion referenced in the brief)

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