Although Palantir's stock has looked unstoppable in recent years, that doesn't mean it will keep going up forever.Palantir Technologies (PLTR +4.14%) has been trouncing the markets for the past few years. This year, it's one of the S&P 500's top performers. As of Dec. 16, the artificial intelligence (AI) stock was up around 150%, while the broad index had risen 16%.And since the launch of ChatGPT on Nov. 30, 2022, which opened up the floodgates for all things related to AI, the share price of Palantir has s ...