Google’s Gemini has reached a remarkable milestone, crossing 1 billion users and becoming the fastest-growing product in the company’s history. The answer could determine whether Gemini becomes a long-term leader in the AI market or simply another hugely popular Google product that eventually loses its edge. Google Search, YouTube, Gmail, Chrome, Android and Google Maps have all achieved billion-user scale, but Gemini has reached the milestone at a dramatically faster pace. This means users can encounter Google’s AI without necessarily seeking it out. If Google’s rapid product improvements slow down, competitors could have more opportunities to catch up or overtake Gemini in specific areas.