OpenAI confidentially filed for a U.S. IPO earlier on Monday, following Anthropic's filing last week. Elon Musk's SpaceX is also preparing to go public on Friday.

OpenAI said it has not decided exactly when the IPO would take place.

OpenAI's confidential filing lands days before SpaceX is set to go public and a week after Anthropic announced its confidential disclosure with the SEC.

The moves comes days ahead of SpaceX's IPO.