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The sparring match between AI supergiants Anthropic and OpenAI hit a new gear during the Super Bowl. Anthropic’s straightforward assault on OpenAI’s advertising decisions caused its daily active users to soar by an incredible 11 percent, destroying competitors such as Google Gemini. Now, as both companies look to potential public offerings later this year, the competition has become personal, with C.E.O.s trading barbs on social media. At a new valuation of $380 billion, Anthropic is showing it can play with the big boys when it comes to talent, funding and public attention in a cluttered market.