Testing Gemini Deep Research on a GEO investigation: it missed key points and got things wrong

dejanseo · x · 2026-11-14

SEO/GEO practitioner dejanseo asked Gemini + Deep Research to produce an investigative-style report on Generative Engine Optimization (GEO). His verdict: mediocre — it missed many important aspects and made claims he disagrees with, such as the idea that changing content does change model preferences. He published the output for others to judge. The takeaway: Deep Research-style products still need domain-expert review, with clear gaps in factual accuracy and judgment on niche topics.

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