Which AI assistant has the most users right now?

ChatGPT leads consumer assistant adoption by a wide margin, OpenAI reported 800 million weekly active users in October 2025, while Google's AI Overviews reach over 1.5 billion searchers monthly by riding existing Google usage. Rankings below those two shift quarter to quarter.

Should I optimize for every AI engine equally?

No. Weight effort by where your audience actually asks questions, adjusted for referral quality and category fit. A developer-tools brand may find Claude and Perplexity punch far above their general-market share; a consumer brand usually should prioritize ChatGPT and AI Overviews first.

What Is AI Search Market Share?

Last updated: July 5, 2026 · Menra Team

AI search market share is the distribution of user adoption across AI answer engines, how many people ask their questions in ChatGPT versus Gemini, Perplexity, Claude, Copilot, or Google's AI Overviews. For GEO programs it is the weighting layer: visibility in an engine only matters in proportion to the audience asking questions there, so per-engine investment should roughly follow per-engine audience.

How the market currently splits

Two properties dominate through different mechanisms. ChatGPT leads destination usage, OpenAI announced 800 million weekly active users at DevDay in October 2025, while Google inserts AI answers into existing search behavior: AI Overviews, launched at I/O in May 2024, reached more than 1.5 billion monthly users per Google's 2025 earnings commentary. Perplexity, Claude, Copilot, and Grok compose a second tier whose share varies sharply by audience: technical, research-heavy users over-index on Perplexity and Claude relative to their general-population numbers.

Why audience share should drive GEO effort

Zero-sum attention. Every category question is asked somewhere; an engine you ignore is a share of your prompt space conceded by default.
Different engines, different mechanics. AI Overviews inherit Google's index and ranking; Perplexity leans on its own crawler (PerplexityBot) and live retrieval; ChatGPT blends parametric memory with OAI-SearchBot browsing. Effort allocation determines which mechanics you learn.
Category skew beats global stats. Measure where your buyers ask, assistant referral segments in analytics and visibility tracking per engine reveal the true local distribution.

Example

A B2B data-infrastructure brand finds global market-share numbers misleading: 41% of its AI referral signups arrive from Perplexity despite Perplexity's low single-digit general share. The team re-weights: Perplexity-first freshness and citation work, ChatGPT second, AI Overviews third, the reverse of what raw adoption stats suggested.

Re-check the distribution quarterly. Model releases and product launches (SearchGPT's July 2024 announcement, for instance) can shift where question volume flows within a single quarter.

Frequently asked questions

Which AI assistant has the most users right now?: ChatGPT leads consumer assistant adoption by a wide margin, OpenAI reported 800 million weekly active users in October 2025, while Google's AI Overviews reach over 1.5 billion searchers monthly by riding existing Google usage. Rankings below those two shift quarter to quarter.
Should I optimize for every AI engine equally?: No. Weight effort by where your audience actually asks questions, adjusted for referral quality and category fit. A developer-tools brand may find Claude and Perplexity punch far above their general-market share; a consumer brand usually should prioritize ChatGPT and AI Overviews first.

Keep exploring

See how AI engines talk about your brand, track mentions across ChatGPT, Perplexity, Claude, Gemini and 5 more. Start with Menra