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OpenAI's Lead Is Contracting as AI Competition Intensifies

🤖 AI Summary

**要約(日本語)**

OpenAI のチャットボット ChatGPT のシェアが縮小し、競争が激化しています。

- **シェアの変化(米国モバイルアプリ)**
- ChatGPT:2025年1月の 69.1 % → 2026年1月の 45.3 %
- Google Gemini:14.7 % → 25.1 %(約2倍)
- xAI Grok:1.6 % → 15.2 %(10倍超)

- **市場全体の成長**
- Apptopia のデータによると、チャットボット市場は前年同月比で 152 %拡大。ChatGPT もダウンロードは増加している。

- **デスクトップ・モバイルウェブの利用状況(SimilarWeb)**
- ChatGPT 訪問数:38億 → 57億(+50 %)
- Gemini 訪問数:2.68億 → 20億(+647 %)

- **結論**
- ChatGPT は依然として訪問数では圧倒的リーダーだが、Google の Gemini と xAI の Grok が急速にシェアを伸ばし、AIチャットボット市場は「二極化」から「多極化」へと移行しつつある。

この結果は、Apptopia と SimilarWeb のモバイル・ウェブ解析データに基づくものです。
OpenAI's rivals are cutting into ChatGPT's lead. From a report: The top chatbot's market share fell from 69.1% to 45.3% between January 2025 and January 2026 among daily U.S. users of its mobile app. Gemini, in the same time period, rose from 14.7% to 25.1% and Grok rose from 1.6% to 15.2%. The data, obtained by Big Technology from mobile insights firm Apptopia, indicates the chatbot race has tightened meaningfully over the past year with Google's surge showing up in the numbers. Overall, the chatbot market increased 152% since last January, according to Apptopia, with ChatGPT exhibiting healthy download growth. On desktop and mobile web, a similar pattern appears, according to analytics firm Similarweb. Visits to ChatGPT went from 3.8 billion to 5.7 billion between January 2025 and January 2026, a 50% increase, while visits to Gemini went from 267.7 million to 2 billion, a 647% increase. ChatGPT is still far and away the leader in visits, but it has company in the race now.

Read more of this story at Slashdot.

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