S&P 500 Rebounds as Anthropic’s Update Tempers AI Concerns

Traders work on the floor of the New York Stock Exchange.

Photographer: Michael Nagle/Bloomberg

US stocks rebounded on Tuesday as AI startup Anthropic PBC said it was expanding the reach of its Claude chatbot to build partnerships in the software and services sectors.

The S&P 500 Index gained 0.8%, with nine of 11 sectors in the green, led by consumer discretionary, industrials and information-technology stocks. The Nasdaq 100 Index rose 1.1%.