"OpenAI's ChatGPT app market share fell from 69.1% in January 2025 to 45.3% in 2026, according to data from mobile intelligence data provider Apptopia, first reported by Big Technology. Over the same period, Apptopia data shows Google's Gemini chatbot app increasing its market share from 14.7% to 25.2%. Elon Musk's Grok has also been growing rapidly, hitting its highest marketshare yet at 15.2%-up from 1.6% at the same time last year, according to the data."
"It's not just OpenAI's app market share that has taken a hit; rivals have also been gaining in terms of web traffic too. According to web traffic data from SimilarWeb, Gemini's main web landing page, Gemini.google.com, narrowed the gap significantly with ChatGPT.com in December 2025, with 28.38% more traffic, while ChatGPT's traffic declined 5.59%. Preliminary data shows Gemini surpassed 2 billion monthly visits for the first time in January 2026,"
"On Wednesday, during Google-parent Alphabet's fourth-quarter earnings call, CEO Sundar Pichai also announced that Gemini had surpassed 750 million monthly active users-up from 650 million from the previous quarter. While ChatGPT still likely maintains a lead with an estimated 810 million monthly active users reported in late 2025, the gap is narrowing rapidly. During the call, CEO Sundar Pichai said the launch of Gemini 3, the company's most advanced model, was a "positive driver" for growth."
ChatGPT's app market share dropped from 69.1% in January 2025 to 45.3% in 2026, with Gemini rising from 14.7% to 25.2% and Grok jumping from 1.6% to 15.2% according to Apptopia. SimilarWeb data shows Gemini.google.com closed the web-traffic gap with ChatGPT.com in December 2025, recording 28.38% more traffic while ChatGPT traffic fell 5.59%. Preliminary data indicates Gemini exceeded 2 billion monthly visits in January 2026. Google reported Gemini reached 750 million monthly active users after Gemini 3's launch and the viral Nano Banana Pro image generator, while ChatGPT's estimated monthly active users remained near 810 million but the lead narrowed.
Read at Fortune
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