OpenAI announced Monday afternoon that it has filed to offer its stock on public markets, just a week after its chief rival, Anthropic did the same. “We recently submitted a confidential S-1,” the ChatGPT maker said in a post on X , referring to the formal name of the filing for an initial public offering. “We have not decided on timing yet; it may be a while because there are things we want to do that are likely easier as a private company.” The artificial intelligence startup added that “it’s