OpenAI builds large-scale AI models — primarily the GPT series — and distributes them through two main channels: a consumer subscription product (ChatGPT, with free, Plus, Pro, and Business tiers) and a developer/enterprise API. ChatGPT is the world's leading AI assistant, with 900M+ weekly active users and 50M+ paying subscribers. Enterprises use the API to embed OpenAI's models directly into their own products and workflows. The company also offers Codex (coding), Sora (video), DALL-E (images), GPT-Live (voice), and an expanding suite of agentic tools. Revenue is split roughly 60% consumer / 40%+ enterprise, with enterprise trending toward parity by end of 2026. Beyond model licensing, OpenAI is actively building into robotics, consumer hardware, e-commerce/shopping, health AI, cybersecurity, and advertising — signaling ambitions well beyond an API company. Customers range from individual consumers and developers to Fortune 500s and U.S. federal agencies. Founded in 2015 as a nonprofit, OpenAI converted to a public benefit corporation structure in late 2025.