This top AI stock is up 75% since April.There are several great companies capitalizing on the artificial intelligence (AI) boom that would make solid stocks to buy right now. But among leading tech giants, Alphabet (GOOG 1.27%) (GOOGL 1.23%) stands out.The stock is up over 75% since hitting a 52-week low in April, but it still trades at a reasonable valuation. With 2 billion users and one of the best enterprise cloud services available, Alphabet is well-positioned to help investors outperform the market. Ho ...