DeepSeek’s rise, Nvidia’s decline and a blockbuster bet on OpenAI were among the highlights.

CEO of the ChatGPT maker says his company has been “on the wrong side of history” with open-source software.

The S&P 500 slipped after the Federal Reserve left interest rates unchanged in its first policy decision of 2025, while Nvidia tumbled.

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A breakthrough Chinese chatbot has sparked alarm about the country’s advances in artificial intelligence (AI) and wiped close ...