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Market Share

ChatGPT Market Share: Global Position

ChatGPT remains the most-used AI chatbot in the world, but its dominance is narrowing. By Similarweb's web-visit measure, ChatGPT held about 54.7% of worldwide traffic across the seven largest AI assistants in April 2026 — down from roughly 76.5% in early 2025 — as Google Gemini climbed to 27.4% and Anthropic's Claude became the fastest-growing of the group. This page tracks where ChatGPT stands globally against every major competitor, how that position has shifted over 15 months, and why headline "market share" figures for ChatGPT range from 55% to 68% depending on what is measured.

5 visualizations 4 sources Last updated June 2026 Free to embed
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Source: Similarweb web-visit share across the seven largest AI assistants, April 2026, as compiled by Momentic (June 2026).
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CHART 1 · WORLDWIDE STANDING

Worldwide AI chatbot web-visit share, April 2026

Share of web visits across the 7 largest Ai assistants

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Source: Similarweb, via Momentic, "Top AI Chatbots by Market Share," June 2026. Total desktop + mobile web visits, worldwide, April 2026; share of the seven-app set. The seven apps drew a combined 10.07 billion visits. Shares may not sum to 100% due to rounding.
CHART 2 · THE 15-MONTH SHIFT

ChatGPT vs Gemini vs Claude, share over time

Web-visit share, Feb 2025 - Apr 2026

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Source: Similarweb, via Momentic, June 2026. Share of the seven-app set at quarterly snapshots, Feb 2025–Apr 2026. Similarweb coverage of these domains begins Feb 2025.
CHART 3 · WORLDWIDE VS US

ChatGPT's lead is wider in the United States

Web-visit share: worldwide vs US ( Apr 2026 )

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Source: Similarweb, via Momentic, June 2026. Web-visit share, worldwide and United States, April 2026. The US market is more concentrated at the top and re-weights the challengers.
CHART 4 · WHO IS GAINING

Quarterly growth: where the momentum is

Quarterly web-visit growth (Apr 2026 vs Jan 2026)

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Source: Similarweb, via Momentic, June 2026. Quarterly web-visit growth, April 2026 vs January 2026, worldwide. Growth is net change between two dates, not a steady rate; figures off a small base (e.g. Claude) reflect rapid scaling rather than parity.

About this data

This page compiles published data on ChatGPT's share of the consumer AI chatbot market and its position relative to competitors. The core figures come from Similarweb web-traffic estimates as compiled in Momentic's June 2026 report, supplemented by OpenAI's own user disclosures (reported by TechCrunch and Reuters) and First Page Sage's US-market estimates.

The AI Behavior Index is the research arm of OneChat AI, an integrated multi-model AI platform. We compile and analyze data from primary research sources to make AI adoption and market trends more accessible to journalists, researchers, and decision-makers.

Why ChatGPT's "market share" varies by source: reported figures range from about 55% to 68% because they measure different things. Similarweb web-visit share across a defined seven-app set puts ChatGPT near 54.7% worldwide; broader chatbot-market estimates that use different app sets or denominators report ~68%; US-only and mobile-app measures differ again. Web-visit share is used as the primary metric here because it is one defined, reproducible quantity — but it excludes native mobile apps, embedded surfaces (e.g. Copilot inside Microsoft 365), and API/enterprise usage, so it understates total model usage and does so unevenly across providers.

Methodology notes: the seven-app set covers standalone, general-purpose assistants on a separable web domain above ~50M monthly visits in mostly English-language markets; it excludes Meta AI, Character.AI, and major non-English assistants such as Doubao, Ernie, and Qwen, which would lower every share figure if added. Similarweb estimates are panel-modeled, carry error bands, and are revised monthly, so single percentages are best read as approximate. Some of Gemini's measured web visits may be driven by Google ecosystem entry points rather than independent demand.

Sources used on this page:

Corrections or suggestions: research@aibehaviorindex.org

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