Important Note: Analytics platforms (Google Analytics, Adobe) often adjust their reporting to reflect changes in AI referrals. In July 2026, we updated historical data to take these changes into account. OpenAI/ChatGPT data, which accounts for the majority of AI referrals, was impacted, which in turn impacted historical market share data.
Total Search Dominance Index
Distribution of referral traffic from traditional and AI search platforms
AI platforms accounted for 2.25% of search activity in September, up from 1.95% in August. Google accounted for 86.3%.
AI-Specific Search Index
Distribution of referral traffic from AI platforms
ChatGPT accounted for 96.3% of AI referral traffic in September, far ahead of Gemini, Perplexity, and Claude.
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ChatGPT
Monthly Market Trends By AI Engine
Month-by-month shifts in AI-specific search referrals
ChatGPT gained share of AI referral traffic from April to September. Gemini and Claude both lost share.
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