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Brand report · September 2026
CoStar: AI Visibility Report
When buyers ask ChatGPT, Claude, and Gemini about commercial real estate, CoStar ranks #3 of 15, a Visibility Score of 29 in Commercial Real Estate .
These rankings are measured from what the three models know from training, not a live web search. The live-web grounded surface is rolling out across the index. Methodology.
CoStar holds a real estate seat but not the top one.
Where it wins. In Commercial Real Estate, CoStar earns a mention rate of 33% and lands first pick 22% of the time, meaning roughly one in five AI recommendations names it above Crexi and LoopNet.
Where it loses. Ranking third of 15, it trails in use-case fit and enterprise queries where buyers get granular, and no AI model consistently elevates it when the prompt is feature-specific or enterprise-framed.
AI-generated analysis of the September 2026 measurements.
ChatGPT 
Claude 
Gemini Being named is not the same as being recommended. Each mention is graded endorsed (a strong pick), listed (a neutral option), or caveated (named with a reservation).
Share of each theme's answers that mention CoStar. Hover a row for the exact prompt. Compare shapes on the head-to-head page.
Gaps Use-case fit · Enterprise pick · Feature-led ask
Share of CoStar's mentions where the AI models name this brand in the same answer. That is the real competitive set in the AI channel.
Scores are measured from real AI answers, refreshed monthly. Methodology.
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