Artificial intelligence helped drive Alphabet's Q1 results.Shares of Alphabet (GOOG -3.03%) (GOOGL -3.08%) soared to new highs following its first-quarter earnings report. This is a continuation of the momentum the stock has seen over the past year, with its shares up over 60% during that stretch.Here's a look at why Alphabet shares were climbing following its Q1 earnings report and, more importantly, whether or not it's too late to buy the stock following its strong gains.Alphabet as an AI companyOn its ea ...