ChatGPT hits 664M mobile daily users as Meta's Muse nears 2 million
In brief
- ChatGPT had 664 million mobile daily users in September, up 69% year over year.
- Gemini reached 151 million mobile daily users, up 321% year over year.
- Meta's Muse agent app hit 1.96 million mobile daily users by October 5.
- Muse's user retention is the key open question, Bank of America said.
The chatbot leaders keep adding mobile users
ChatGPT's 664 million mobile daily users were up 7% from August and 69% from a year earlier, according to the Sensor Tower figures reported by Crypto Briefing. Gemini grew faster off a smaller base. Its 151 million mobile daily users marked an 11% month-over-month rise and a 321% jump year over year.
These are mobile daily active users only (they aren't total user counts). The companies' own numbers are measured differently. OpenAI said on September 29 that ChatGPT had 1.2 billion weekly users, and Google's Gemini app passed 1 billion monthly users in August 2026.
Muse enters a crowded field
Muse launched on September 8 as a personal AI agent, and it runs on Meta's Muse Spark model. It's built to handle tasks like managing email, booking reservations and working toward goals a user sets. By October 5, Muse had 1.96 million mobile daily users in the same Sensor Tower dataset.
That's roughly level with xAI's Grok.
In the same data, Grok had 2 million mobile daily users, while Meta's own Meta AI app had 6 million (so Muse hasn't caught Meta's older assistant).
Bank of America's read: agents, then retention
Bank of America's report frames the numbers as part of a broader shift in consumer AI, away from chat windows and toward autonomous, agentic systems that take actions on a user's behalf. Muse fits that description. The report also pointed to strong early engagement and downloads for the app.
Downloads don't tell the whole story, though. Bank of America flagged retention (whether users keep coming back and form a daily habit) as the key open question for Muse.
Frequently asked questions
How many mobile daily users does Meta's Muse app have?
Muse had 1.96 million mobile daily users by October 5, according to Sensor Tower data cited by Bank of America analyst Justin Post. The app launched on September 8 as a personal AI agent running on Meta's Muse Spark model.
Why are ChatGPT's 664 million users different from its 1.2 billion figure?
The 664 million figure counts mobile daily active users in September, per Sensor Tower data cited by Bank of America. The 1.2 billion figure is weekly users, which OpenAI itself reported on September 29, 2026. The two numbers use different measurements.
What concern did Bank of America raise about Muse?
Bank of America pointed to strong early engagement and downloads for Muse. It flagged retention, meaning whether users keep coming back and form a daily habit, as the key open question for the app.
