March 16, 2026 — A new Graphite.io study reveals that AI Assistants Make Up 56% of Global Search Volume, generating 45 billion monthly sessions worldwide and 5.4 billion in the U.S., where they represent 34% of search activity.
The analysis by Graphite.io CEO Ethan Smith, based on Similarweb data for top AI tools including ChatGPT, Gemini, Perplexity, Grok and Claude, shows ChatGPT holding 89% of the global AI market share. Notably, 83% of AI usage occurs via mobile apps, and search-like prompts account for 28% of global and 17% of U.S. search volume. Total search plus AI activity has grown 26% globally since 2023.
Key Study Findings
AI Assistants Make Up 56% of Global Search Volume, surpassing prior estimates by factoring in both web and mobile app sessions, which are 4-5 times higher than web-only data, according to coverage in ALM Corp and Ignite Visibility. This mobile-driven growth highlights AI’s rapid rise from zero to dominance in just three years.
Smith emphasized in Search Engine Land reporting that AI expands discovery rather than replacing traditional search, urging marketers to optimize for both SEO and Generative Engine Optimization (GEO). AI referrals reportedly convert 4.4 times better than traditional search traffic.
“AI is much bigger than you think,” Smith stated in the study, noting the underreported scale due to app data exclusion in past analyses.
Industry Reactions
Digital marketing outlets have amplified the findings, with AI Assistants Make Up 56% of Global Search Volume becoming a key takeaway. Performance Marketing World highlighted faster-than-expected growth, while Lazysoft and MSN echoed the 45 billion session figure and ChatGPT’s lead.
Ignite Visibility and ALM Corp advise adapting strategies for this shift, tracking AI referrals and dual optimization. The stat gained traction in SEO circles from March 8-10, 2026.
Social Media Buzz
On X, @heyalexhey cited the study via @ethan_graphite, noting ChatGPT’s 20% share of global search traffic and 83% mobile usage in a post. Discussion remained niche without major virality.
For related insights, see SEO Spyglass articles.