OpenAI earns revenue in three main ways. First, ChatGPT subscriptions: consumer tiers such as Plus and Pro, plus Business, Enterprise and Edu seats sold to organizations. Second, the API platform, where developers and companies pay per token to build OpenAI models (GPT, reasoning, image, audio and embeddings) into their own software. Third, enterprise and partner deals, including Codex coding agents, custom deployments, and revenue sharing with Microsoft, which resells OpenAI models through Azure. ChatGPT also has a free tier funded by paid users, and OpenAI has been adding commerce and advertising-style formats to monetize free usage.