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A Chinese artificial intelligence startup is rattling Silicon Valley and Wall Street after it demonstrated AI models on par with OpenAI’s — for a fraction of the cost and energy.

Shares of telecommunications conglomerate AT&T (NYSE:T) jumped 7.1% in the afternoon session after the company reported fourth-quarter results that beat analysts' EPS expectations. Its revenue also narrowly outperformed Wall Street's estimates based on better postpaid phone net adds and better broadband net adds. Previously-provided 2025 guidance was largely reiterated, which is comforting. Overall, this quarter had some key positives.

Shares of nuclear power providers tumbled on Monday as markets reacted to the success of a Chinese startup’s AI model that challenges the performance of the most advanced American models.

United Parcel Service is slated to report fourth-quarter results on Thursday morning, with analysts expecting the company to record a second straight quarter of year-over-year revenue and profit growth.

This story incorporates reporting fromThe Daily Telegraph, Seeking Alpha and Bloomberg on MSN.com.The emergence of China’s DeepSeek has caused notable disruption in the U.S. stock markets. DeepSeek, a start-up based in Hangzhou, recently unveiled a new artificial intelligence chatbot. This development sent shockwaves through technology sectors, leading to a steep drop in U.S. stock indices. The tech-heavy Nasdaq Composite index, in particular, experienced a significant decline, plummeting by 3.6

Here’s what you need to know about DeepSeek, the Chinese AI startup that rattled markets as its app dethroned OpenAI's as the most-downloaded free app in the U.S. on Apple.

The S&P 500 and Nasdaq plunged at midday when Chinese artificial intelligence startup DeepSeek shook up the sector with a lower-cost large language model.