SAN FRANCISCO -- Google's Gemini AI app now has more than 400 million monthly active users, the company's CEO Sundar Pichai said Tuesday during a press briefing ahead of Google I/O 2025.

Pichai said that Google's AI overviews now reach more than 1.5 billion users every month. The company also announced during Google I/O 2025 that it's putting AI mode in front of more users, as Google tries to update Search with more conversational experiences powered by generative AI.

The Gemini app is Google's most direct challenge to compete with OpenAI in the chatbot era. According to Google's recent court filings for its ongoing antitrust suit, the company estimated in March that Gemini had 350 million monthly active users, whereas ChatGPT had around 600 million.