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OpenAI

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. Acquired Windsurf (Codeium) for $3B in May 2025; 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 ModelsUnited States flagUnited Statesprivate

At a glance

Total raised
$162.3B
last round growth
Headcount
1k-5k
approximate · public range
Headquarters
San Francisco
United States flagUnited States
Founded
2015
11 years active
Status
Private
Foundation Models
Latest valuation
$840B
Growth · 2026
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