[ChatGPT Weekly Active Users Reach 800 Million] On October 7, OpenAI CEO Altman revealed during the Developer Day keynote speech that ChatGPT's weekly active users have increased to 800 million, up from 700 million last month. OpenAI currently has 4 million developers, and its API processes 8 billion tokens per minute. This Developer Day is the largest ever held by OpenAI, with the opening ceremony attracting over 22,000 live viewers.