OpenAI says its ads business is booming as it marches toward an IPO

OpenAI CEO Sam Altman once said that adding advertising would be "a last resort for us for a business model." Kevin Dietsch/Getty Images OpenAI's ad business is on a tear. ChatGPT ads have reached $1 billion in annualized revenue run rate, OpenAI said on Monday. Ads on OpenAI's chatbot launched less than 200 days ago. OpenAI is touting the speedy growth of its ad business as it prepares for an initial public offering. On Monday, OpenAI said that ad sales on ChatGPT have reached $1 billion in…