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ChatGPT app hits 1 billion monthly active users in record time, data shows

Sensor Tower said ChatGPT became the fastest app to hit the milestone as rival Anthropic’s Claude gained 56 million monthly active users.

  • According to Sensor Tower and Reuters, ChatGPT reached 1 billion MAUs in May, roughly three years after launch, becoming the fastest app ever to reach the milestone.
  • The platform surpassed the growth trajectories of TikTok, Instagram, YouTube, and Google Maps, marking one of the fastest adoption curves in consumer technology history.
  • While ChatGPT dominates in overall reach, rival startup Anthropic is showing rapid momentum, with its Claude app reaching 56 million MAUs and recording year-over-year growth of about 640 per cent.
  • Anthropic confidentially filed for an IPO on Monday, while OpenAI is also preparing to file for an IPO in the coming weeks.
  • Research from Sensor Tower found ChatGPT users who installed Claude in the first quarter spent 5% less time on ChatGPT one month later, compared with usage in the prior eight months.
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ChatGPT, OpenAI's Artificial Intelligence Assistant (IA), has become the fastest app to get 1 billion active monthly users.

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ChatGPT, from the American company OpenAI, has achieved another significant milestone. According to estimates from the analytics firm Sensor Tower, the popular app surpassed one billion monthly active users in May. It reached this milestone roughly three years after its launch, making it the fastest-growing app of its kind in history.

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Reuters broke the news in New York, United States on Tuesday, June 2, 2026.
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