OpenAI owns ChatGPT, with the OpenAI Foundation overseeing its governance to...

https://bizzmarkblog.com/why-microsoft-investment-value-is-not-the-same-as-governance-control/

OpenAI owns ChatGPT, with the OpenAI Foundation overseeing its governance to ensure responsible development. Microsoft is a key investor, providing significant funding and cloud support, but it is not the parent company