OpenAI
OpenAI is a Foundation Models company founded in 2015 and based in San Francisco, United States. It has raised $162.3B in total funding, most recently a Growth in 2026 at a $840B valuation.
Builds frontier large language models including GPT and Codex that power the majority of AI coding tools via API, plus first-party products like ChatGPT and Codex CLI. Attempted $3B acquisition of Windsurf (Codeium) in 2025 — deal collapsed over Microsoft IP concerns; launched Codex CLI as an open-source terminal coding agent; models underpin Cursor, Copilot, and most coding agents.
The dominant model provider for AI coding — nearly every IDE agent and code assistant in the sector calls OpenAI's APIs, and its Codex model family specifically targets code generation.
openai.com ↗·Foundation Models·
United States·private 
