OpenAI
OpenAI is an American artificial intelligence (AI) public benefit corporation headquartered in San Francisco. It develops proprietary generative AI models, particularly its GPT series of large language models (LLMs). Its release of ChatGPT in November 2022 has been credited with catalyzing the AI boom; as of 2026 ChatGPT is the fifth-most-visited website globally. OpenAI also releases Codex, an AI coding agent, and the GPT Image models. In April 2026, OpenAI closed a funding round with a post-money valuation of $852 billion. OpenAI was founded in 2015 in Delaware as a nonprofit, with Elon Musk and Sam Altman as co-chairs; Musk resigned in 2018. A for-profit subsidiary was created in 2019, and a 2025 restructuring converted the subsidiary into OpenAI Group PBC, that is 26% owned by the nonprofit OpenAI Foundation. Microsoft has invested over US$13 billion into OpenAI. OpenAI partners with semiconductor firms including Nvidia, AMD, and Broadcom, and cloud computing services from Microsoft, Amazon, and Google.
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