S&P 500 flat as bond yields offset AI stock gains

The S&P 500 was flat on Tuesday as rising government bond yields dampened risk sentiment, offsetting gains in AI-related stocks fueled by optimism over Anthropic's planned IPO. The 10-year Treasury yield climbed to 5.078%, near its highest since 2007, strengthening expectations of tighter monetary policy. Oil prices retreated, but inflation concerns kept risk assets under pressure. Anthropic's IPO prospectus showed sharp growth but wider losses, targeting a $2 trillion-plus valuation. Job openings fell to 7.079 million in August, and the September Consumer Confidence Index missed estimates at 81.9. Traders see a 70% chance of another rate hike in October, with at least six Fed officials set to speak Tuesday.