OpenAI
Japanese OpenAI（オープンエーアイ）
OpenAI is a U.S. AI company that offers ChatGPT, Codex and an API for developers. Knowing whether a tool you use comes from OpenAI tells you where to check its plans and how it handles what you type.
OpenAI is the company that made ChatGPT. On its official pages it calls itself an AI research and deployment company, and says its mission is to make sure AI that is generally smarter than humans benefits all of humanity. It started as a nonprofit in 2015, and it now says the nonprofit OpenAI Foundation controls OpenAI Group, a public benefit corporation. Think of it as a head office with several brands: the product names differ, but one company sets the rules.
Watch out The company description is OpenAI's own words. It says data from its business plans and API is not used to train its models by default, but on personal plans you should check the settings yourself.
Source: OpenAI, "About" (archived November 4, 2026) · OpenAI, "Our Structure" (archived October 20, 2026) · OpenAI, "Enterprise privacy at OpenAI" (updated January 8, 2026)