Palantir's stock is extremely expensive.Palantir (PLTR +4.14%) has been on a remarkable run since the artificial intelligence (AI) arms race began in 2023. Its stock is up over 2,700% since 2023, and has doubled in each year since then. However, there is a bit of a problem with Palantir's stock. It has become drastically overvalued, and I think it could be ripe for a pullback in 2026, opening the door to other companies to surge past it.Two AI companies that could be larger than Palantir by the end of 2026 ...