ChatGPT voices personal product picks far more than Gemini, AI Overviews
A study curating 2,528 real commercial-advice queries into a dataset called ConsumerQ, posted to arXiv in September 2026, audited 1,536 AI responses across ChatGPT, Google Gemini and Google Search’s AI Overviews. ChatGPT expressed a first-person product preference in 79% of its product-recommending responses, compared with 7% for Gemini and 2% for AI Overviews. ChatGPT and Gemini’s web interfaces shared only 5.4% of cited domains on average, with zero domain overlap in 76.7% of query comparisons — a gap the researchers note narrows when comparing the same models’ raw APIs instead of their consumer interfaces.
Why it matters: The chatbot most willing to state a personal pick is also the one with an advertising incentive to make one, and which assistant a shopper opens changes both the opinion they get and the sites behind it.
The record: ChatGPTGeminiGoogle AI Overviews
Glossary: AI Overviews
Via arXiv AI Overviews & brand visibility ↗
Posted to the wire October 9, 2026. Edited by Joe Balewski.