In 2020, Musk said on Twitter that his confidence in the company was "not high" when it came to safety.
"OpenAI should be more open imo," the billionaire tweeted in response to an investigation into the company by MIT Technology Review.
The publication said that an investigation into OpenAI revealed a culture of secrecy that ran counter to the nonprofit's purported commitment to transparency.
More recently, Musk said he paused OpenAI's access to Twitter's database for training its software.
"Need to understand more about governance structure & revenue plans going forward," he said on Twitter on Sunday. "OpenAI was started as open-source & non-profit. Neither are still true."
Sources: Twitter, Insider, MIT Technology Review