A Floodlight analysis of 550 live queries across 11 consumer product categories on ChatGPT between May 18 and June 4, 2026, found that 84.4% of queries returned no ad. OpenAI opened its self-serve ad platform to all advertisers in May 2026, dropping the entry point from a $200,000 managed-service minimum to open access. Floodlight tested 50 prompts per vertical across baby gear, baby monitors, baby carriers, stroller wagons, car seats, cribs and crib mattresses, mattresses, beach tents, dog food, arch support sneakers, and women's care and clean beauty. Five categories had zero ads across every single query: beach tents, dog food, arch support sneakers, women's care and clean beauty, and car seats. In the verticals where ads did appear, the brands claiming those slots mostly had nothing to do with the product being asked about.