Apptopia: ChatGPT's US market share fell from 69.1% to 45.3% from January 2025 to January 2026; Gemini rose from 14.7% to 25.1% and Grok rose from 1.6% to 15.2%
• Mobile Market Share: ChatGPT fell from 69.1% to 45.3%, while Gemini rose to 25.1% and Grok to 15.2%. — • Web Traffic: ChatGPT visits grew 50% (to 5.7 billion), compared to Gemini's 647% surge (to 2 billion).Forums:Msmash /Slashdot:OpenAI's Lead Is Contracting as AI Competition Intensifies
Context & Ripple Effects
ChatGPT entered this period with a much larger consumer footprint: late-2025 coverage put it at roughly 810 million monthly active users while Gemini was growing faster. Earlier mobile rankings had already placed Gemini second and Grok fourth, signaling that the market was becoming multi-player rather than winner-take-all.
Apptopia's figures quantify that shift across both mobile share and web traffic: ChatGPT still grew in absolute web visits, but Gemini's growth was substantially faster. Subsequent Sensor Tower coverage also showed ChatGPT near 46% share as Gemini approached 28%, consistent with a narrowing lead rather than a one-off fluctuation.
First-order effects
- ChatGPT's US mobile-share lead narrows materially, while Gemini and Grok gain a larger share of consumer AI use.
- OpenAI retains the largest reported web audience, but Gemini's much faster visit growth makes relative momentum—not just absolute scale—the immediate competitive metric.
Second-order effects
- Gemini and Grok gain stronger evidence to compete for user attention and product distribution, while OpenAI faces greater pressure to defend engagement rather than rely on category leadership.
- The divergence between ChatGPT's still-growing traffic and declining share suggests consumer AI users are increasingly trying or using multiple assistants, reducing the value of a single-app share metric in isolation.
Third-order effects
- If the pattern persists, consumer generative AI may settle into a more segmented market in which distribution channels and product ecosystems determine share alongside model quality.
- A less concentrated usage base would make sustained growth and monetization depend more on retaining users across mobile and web, rather than simply being the default first AI app.
The trend: Consumer AI is moving from ChatGPT-led category creation toward a multi-assistant market where challengers can gain share even as the leader continues to grow.