OpenAI reports over 1.2 billion weekly active users for ChatGPT as AI expands into work environments

On September 30, 2026, OpenAI announced that ChatGPT has surpassed 1.2 billion weekly active users during its 2026 Developer Day event. The company also reported that ChatGPT Work and Codex each have over 35 million weekly users, with the number of enterprises using OpenAI products reaching 2.5 million. OpenAI noted that ChatGPT's user base grew from 1 billion in July 2026, signaling a shift in generative AI from personal use to professional applications. The rise in ChatGPT Work and Codex users highlights increasing demand for document processing, data analysis, software development, and workflow automation among businesses and developers. OpenAI is expanding its enterprise AI strategy with the introduction of 'Dots,' an AI agent capable of cross-app task execution, integrating with Codex and ChatGPT Work to handle research, data analysis, document creation, and software development. OpenAI emphasized that the growth in enterprise users is key to transforming AI from a conversational tool into a work partner. The company's focus on enterprise markets underscores its strategy to position AI as an essential tool for business operations. By leveraging its existing products, OpenAI aims to enhance productivity and streamline workflows for organizations. The expansion of its enterprise offerings reflects a broader industry trend toward integrating AI into core business functions, driven by the increasing demand for automation and efficiency in the workplace.