Fool.com contributor Parkev Tatevosian discusses the key innovations provided by Tesla (TSLA -1.00%), Palantir (PLTR 5.09%), Amazon (AMZN -1.54%), and C3.ai (AI 2.06%) in artificial intelligence (AI). He compares the four AI stocks on financial metrics, including valuation, to determine the best stock to buy.

*Stock prices used were the afternoon prices of Oct. 17, 2023. The video was published on Oct. 18, 2023.