The ⁠S&P 500 and Nasdaq were set for their biggest one-day gain in more than a ⁠month on Monday, as tech stocks advanced after Anthropic's initial public offering filing put ​artificial intelligence back in focus in a week packed with corporate earnings. Anthropic disclosed steep losses and great ⁠revenue growth in its filing for a US IPO, detailing its ambition to build AI systems capable of reshaping the global economy despite the high costs of developing the technology.