The vaunted AI company may have a more challenging year in 2026.Nvidia (NVDA 3.30%) has made history in recent years by making the go-to product for training and running high-performance artificial intelligence (AI) applications. Its graphics processing units (GPUs) helped make Nvidia the biggest publicly traded company in the world, briefly achieving a market capitalization of more than $5 trillion.Becoming No. 1 was great for the company and its shareholders. But it may be tougher in 2026 for Nvidia to ma ...