Fool.com contributor Parkev Tatevosian discusses the key innovations provided by Tesla (TSLA -3.48%), Palantir (PLTR -0.33%), Amazon (AMZN -0.01%), and C3.ai (AI -4.86%) 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.