OpenAI confidentially files for IPO weeks after Anthropic decided to go public

OpenAI, the company behind ChatGPT, has confidentially filed paperwork for a stock market listing in the United States. If it goes ahead, the IPO could become one of the biggest and most valuable public offerings in history, with OpenAI currently valued at more than $850 billion.

OpenAI’s IPO announcement comes just weeks after its biggest rival, Anthropic, the maker of the Claude chatbot, revealed that it had also confidentially filed for a US stock market listing.