AI giant OpenAI has experienced a significant decline in its market share, dropping from 75% in October to 61% in November 2025. The figure marks the biggest loss of search market share it has had in any month.

This is a notable decline from its previous market share, indicating increased competition from smaller players. OpenAI’ s market share has been declining gradually, with several competitors like Perplexity and Claude AI gaining ground.

Despite the decrease, OpenAI continues to dominate the generative AI chatbot market, holding a significant 61% market share as of November 7, according to data published in First Page Sage.

Before this month, OpenAI's market share witnessed fluctuation but maintained a commanding lead over competitors throughout 2025.

Market Share Breakdown o

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