How we built ChatGPT's novel ad stack for user trust and relevance
OpenAI engineering blog on October 21 describes how it built the ChatGPT ad stack, using large language models to understand conversation intent and serve relevant ads. The core principles are strict separation between ads and answers, ads never affecting answer content, conversations kept private from advertisers, and no sale of user data. This matters because it is the first systematic disclosure of OpenAI advertising technology design, showing how a new conversational ad format balances monetization with model neutrality.
SOURCES
- OpenAI Blog2026-10-21 07:00