AI Visibility Index: What three months of data reveals | MarTech

"AI search evolves every month. This constant flux is reshaping which brands get visibility and which sources AI models trust most. We now have three months of data in the AI Visibility Index, tracking ChatGPT and Google AI Mode. The key takeaway: AI search is volatile. This is likely to be normal for the immediate future. The brands that win are monitoring and adapting to these changes in real-time."

"ChatGPT: Unique brand mentions fluctuated. Meanwhile, sources cited by ChatGPT surged 80% in October alone - a fundamental shift toward greater source diversity. Google AI Mode: Brand mentions dropped 4% from August to October, suggesting tighter controls on recommendations. Source diversity increased more moderately at 13%, indicating a more conservative approach than ChatGPT. Key trends over three months Reddit's correction and resurgence: ChatGPT reduced Reddit citations by 82% between August and October. However, it remains the fourth most-cited source in ChatGPT. During the same period, Google AI Mode increased Reddit usage by 75%, making it the second most-used source. The platforms are converging on Reddit's value, just from opposite directions."

"Brand diversity varies by vertical and model: In ChatGPT, Consumer Electronics saw a 20% increase in unique brands mentioned, while Finance dropped 15%. Google AI Mode showed universal declines across almost every vertical. More proof that each model requires its own approach. Top brands remain relatively stable: Among the top 100 brands, there were 25 new entrants over three months-but only two broke into the top 50. For leading brands, changes in visibility stayed"

AI search visibility shifts monthly, causing volatile changes in which brands receive prominence and which sources models cite. Three months of tracking across ChatGPT and Google AI Mode measured responses to 2,500 real-world prompts across five verticals: Business & Professional Services, Digital Technology & Software, Consumer Electronics, Fashion & Apparel, and Finance. ChatGPT increased source diversity dramatically, with an 80% surge in sources cited in October, while Google AI Mode showed a more conservative 13% increase in source diversity and a 4% drop in brand mentions. Model behavior varied by vertical, and platforms diverged on Reddit usage and brand visibility dynamics.

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