OpenAI Says ChatGPT Hits 1.2 Billion Weekly Active Users

At OpenAI DevDay on 09-30, OpenAI officially disclosed that ChatGPT has reached 1.2 billion weekly active users, continuing its sharp growth from the previously announced 800 million and cementing its position as the world's largest consumer AI application. Multiple posters (@firstadopter, @kimmonismus, and OpenAI staff member Harper Carroll) relayed the figure.

Confirmed

• OpenAI officially announced at DevDay: ChatGPT has reached 1.2 billion weekly active users, extending its milestone-scale user growth (the previously public figure was 800 million).
• DevDay also introduced a new "Sign in with ChatGPT" mechanism: third-party apps can reuse the token from a user's ChatGPT subscription via this login — for example, meeting apps can be used directly inside ChatGPT.

Why it matters

• 1.2 billion WAU means ChatGPT's consumer penetration is still expanding rapidly, forming the foundation for its commercialization and ecosystem expansion.
• kimmonismus sees Sign in with ChatGPT opening up new possibilities: logging in instantly reuses the subscription token; he recalled the old GPT Marketplace and envisioned a plugin-style extension ecosystem, suggesting this could pave the way for an official app marketplace.
• He also criticized the event format: the keynote was overloaded with information, and some demos felt "cute" and better suited to workshops than the main stage.

2026-09-30 ~ 2026-09-30 · 5 related posts

• [source] ChatGPT hits 1.2 billion weekly active users — firstadopter · 2026-09-30
• ChatGPT hits 1.2B weekly active users, but DevDay keynote was overloaded, critic says — kimmonismus · 2026-09-30
• ChatGPT hits 1.2B weekly users as apps can tap users' subscription tokens — kimmonismus · 2026-09-30
• [source] Sign in with ChatGPT seen as groundwork for a new OpenAI app marketplace — kimmonismus · 2026-09-30

1 near-duplicate retellings: HarperSCarroll