Anthropic Confidentially Files For IPO As Frontier AI Labs Race To Go Public

Four days after releasing its latest Claude Opus 4.8 model and raising $65 billion at a $900 billion valuation, Anthropic confidentially filed a draft Form S-1 with the SEC late Monday morning for a proposed IPO of its common stock."This gives us the option to go public after the SEC completes its review. The proposed initial public offering will depend on market conditions and other factors," the maker of the Claude chatbot wrote in a press release.The move puts Anthropic and OpenAI in a race to become the first major frontier AI lab to tap public markets, as investor appetite for AI infrastructure and all things SpaceX remains hot into early June.It's "worth noting: filing first ≠ pricing first a confidential draft S-1 starts the SEC clock but sets no date," CNBC reporter Deirdre Bosa pointed out on X.worth noting: filing first ≠ pricing first

a confidential draft S-1 starts the SEC clock but sets no date https://t.co/EY8X4Q4y8N

— Deirdre Bosa (@dee_bosa) June 1, 2026The Polymarket bet "Will Anthropic or OpenAI IPO first?" shows that the confidential S-1 filing was a surprise to prediction markets.Anthropic's confidential S-1 filing was a surprise to prediction markets https://t.co/08PxrLSOXG pic.twitter.com/TivykIBSZb