OpenAI President Greg Brockman testified Monday for a lawsuit Elon Musk brought against him and Sam Altman over the company's structure. Bloomberg/Getty Images Greg Brockman on Monday confirmed that OpenAI is exploring an IPO. He said his personal stake in the ChatGPT makers is worth nearly $30 billion. In court on Monday, Musk's lawyer grilled Brockman about his desire to be rich. Greg Brockman on Monday confirmed that OpenAI is exploring an IPO, as well as his own stake in the ChatGPT maker. Testifying in an Oakland federal courtroom, Brockman said his stake in OpenAI is worth nearly $30 billion — a value that places him among the 100 wealthiest people in the world. The Forbes billionaire ranking ranks people with that level of wealth in the 80s or 90s. Brockman also confirmed that OpenAI, whose latest fundraising round valued the artificial intelligence company at $850 million, is exploring an initial public offering. Brockman is not currently listed on the Forbes ranking.…