OpenAI owns ChatGPT and handles its development. The OpenAI Foundation oversees...

https://sergiossplendidcolumn.timeforchangecounselling.com/does-an-agi-declaration-transfer-ownership-of-chatgpt

OpenAI owns ChatGPT and handles its development. The OpenAI Foundation oversees governance, ensuring responsible use. Microsoft is a significant investor but does not own or control ChatGPT