ChatGPT’s Rapid Growth in Active Users

ChatGPT doubled its weekly active users in less than six months, reaching 400 million by February 2025. According to a16z, the app’s growth accelerated after the release of new models and features. It initially took ChatGPT nine months to grow from 100 million weekly users in November 2023 to 200 million in August 2024, but the next doubling happened in under half that time.

Key Milestones and User Adoption

ChatGPT became the fastest app to hit 100 million monthly users two months after its November 2022 release. By November 2023, it had 100 million weekly users, growing to 300 million by December 2024. New features like GPT-4o and Advanced Voice Mode contributed to usage spikes, with the o1 model series driving further growth from September to October 2024.

Consistent Mobile Expansion

ChatGPT’s mobile growth remained steady, with monthly increases between 5% and 15%. By early 2025, 175 million out of 400 million weekly users accessed the app on mobile devices, showing sustained interest across platforms.

Competition and Market Impact

The market saw rising competition, with apps like DeepSeek capturing 15% of ChatGPT’s mobile user base and reaching No. 2 globally in just 10 days. DeepSeek users showed higher engagement than Perplexity and Claude, but ChatGPT still led as the No. 1 AI app by unique monthly web visits and mobile users, according to Similarweb.