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ChatGPT User Base Nears 1 Billion After Seven-Month Delay Amid Emerging Challenges

ChatGPT User Base Nears 1 Billion After Seven-Month Delay Amid Emerging Challenges

September 29, 2026
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ChatGPT User Base Nears 1 Billion After Seven-Month Delay Amid Emerging Challenges

Internal data from OpenAI reveals that ChatGPT’s weekly active users are nearing the 1 billion mark. This milestone, initially projected for late last year, was achieved seven months later.

Despite the delay, this scale remains impressive. In under four years since its launch, ChatGPT has amassed a massive user base, firmly placing it among the fastest-growing internet applications, even if it doesn’t claim the title of “fastest growth.” The company’s spokesperson declined to comment on these figures.

Beneath the surface, growth has slowed. Three key factors are diverting traffic from ChatGPT.

First, Google’s Gemini is being deeply integrated into its search engine, which serves billions of users. Every default intelligence feature behind the search box subtly shifts user habits. Second, the autumn release of GPT-5—a model with a turbulent development history—sparked widespread user criticism, causing a clear dip in weekly active user growth. Third, Anthropic’s Claude has gained market share, with multiple research institutions confirming that Claude has captured a portion of the chatbot market following the GPT-5 controversy.

When a product approaches 1 billion weekly active users, the challenge shifts from “whether it can grow” to “how to sustain its position.” These three trends indicate that the chatbot landscape is evolving from a single dominant player to a competitive field among multiple strong contenders.

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