Overview
- SensorTower reported in May 2026 that ChatGPT had about 1,000 million monthly active users, making it the fastest consumer app to hit that scale in roughly three years.
- OpenAI had previously disclosed a different cadence of usage, saying its weekly active users totaled about 900 million at the end of February 2026, which underscores the platform’s very large and frequent audience.
- SensorTower’s second-quarter breakdown shows ChatGPT ahead of rivals by absolute scale while listing Gemini at 472 million, Doubao 106 million, Dola 78 million, DeepSeek 68 million, Meta AI 61 million, Claude 56 million, Perplexity 44 million, and Copilot 31 million.
- Some competitors are growing faster year over year, with SensorTower reporting Meta AI up roughly 973% and Anthropic’s Claude up about 640%, signaling that user time and engagement can shift quickly even if ChatGPT leads in total users.
- The rise reflects years of GPT model improvements and added multimodal features that made the product useful from first use, and it is changing daily routines by replacing some searches and app tasks while prompting big tech and startups to accelerate AI rollouts and raise questions about privacy, content quality, and workplace impacts.