ChatGPT-maker OpenAI on Monday took the first step toward going public, one week after arch-rival Anthropic announced its own filing, as both companies look to raise the massive sums needed to expand.

Anthropic takes first steps towards IPO, beating Sam Altman-led OpenAI. Anthropic has 76% probability of making debut first.

June 8 : ChatGPT-maker OpenAI confidentially filed for a U.S. initial public offering on Monday, joining rival Anthropic in a push toward the stock market as investors seek…