ChatGPT reached 400 million weekly active users by February 2025, according to a report from Andreessen Horowitz (a16z).

This figure represents a doubling of its user base in just six months, attributed to new models and features.

The launch of GPT-4o with multimodal capabilities and advanced voice mode significantly boosted ChatGPT’s growth, especially between April and October 2024.

Mobile usage has steadily increased, with 175 million users accessing the app on mobile devices.

Monthly growth rates for mobile users have ranged from 5% to 15% over the past year, as stated in a16z’s analysis.

Since its launch in November 2022, ChatGPT has set growth records, reaching 100 million monthly users in two months.

Recent OpenAI developments