OpenAI has confidentially filed for an IPO with the Securities and Exchange Commission, joining the party a week after Anthropic did the same and days before Elon Musk's SpaceX is set to hit the public market. The artificial intelligence company, which is valued at more than $850 billion , has been gearing up to go public as soon as the fourth quarter of this year. A confidential filing allows the company to submit its financials to regulators for review before they're made available to the