Amazon.com Inc. is joining Microsoft Corp. and Google in the generative artificial intelligence race, announcing technology aimed at its cloud customers as well as a marketplace for AI tools from other companies. Amazon Web Services is introducing two large-language models, Titan, which can be used to summarize content, write blog posts, and answer questions. Microsoft, Google, and Meta Platforms Inc. are also developing large-language models to capitalize on the technology. AWS has also partnered with AI companies to expand its suite of machine-learning applications.