
ChatGPT has surpassed 400 million weekly active users, up from 300 million in December 2024. This is a big achievement for OpenAI, as competition in the generative AI space continues to intensify following the successful launch of DeepSeek R1 and the recent release of Elon Musk’s Grok 3.
chatgpt recently crossed 400M WAU, we feel very fortunate to serve 5% of the world every week
— Brad Lightcap (@bradlightcap) February 20, 2025
2M+ business users now use chatgpt at work, and reasoning model API use is up 5x since o3 mini launch
we'll bring GPT-4.5 and GPT-5 to chat and the API soon, with unlimited GPT-5 for… https://t.co/7hfyUcIyBW