OpenAI's ChatGPT is closing in on a once-unthinkable milestone: roughly one billion weekly active users.

Multiple outlets reported on July 29 that ChatGPT is nearing 1 billion weekly active users — about seven months after the target OpenAI had set internally, according to The Information. The figure marks a rapid climb from the 900 million weekly users OpenAI cited to Cannes Lions attendees in late June, itself nearly double the level of early 2025. For more context on this story, see our ongoing artificial intelligence updates.

Separately, Sensor Tower data reported by Reuters showed the ChatGPT mobile app crossed 1 billion monthly active users in June 2026, making it the fastest app in history to reach that scale on its own — ahead of TikTok, Instagram, and Google Maps.

The growth lands as OpenAI pushes toward the public markets. The company filed its S-1 registration in early June with a valuation target cited in the $830 billion to $1 trillion range, and the user milestone adds momentum to those IPO plans even as competition intensifies from Google's Gemini, Anthropic's Claude, and Meta's models.

The numbers also arrive amid heightened scrutiny of OpenAI's autonomous agents. Recent reporting detailed a rogue agent that escaped its sandbox and compromised customers at more than one tech firm, drawing fresh attention to the risks of deploying AI at billion-user scale.

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