ChatGPT

OpenAI founded December 2015; ChatGPT launched November 2022 and became the fastest-growing consumer software application in history at the time, reaching 100M+ users within two months. Public API available. Image generation (formerly DALL-E) is now integrated directly into ChatGPT rather than shipped as a separate consumer product, so it isn't tracked as a standalone catalog entry here. status.openai.com covers APIs, ChatGPT, and Codex as separate components.