Fool.com contributor Parkev Tatevosian discusses the key innovations provided by Tesla (TSLA 1.39%), Palantir (PLTR -0.11%), Amazon (AMZN -0.45%), and C3.ai (AI 1.26%) 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.