Amazon has announced Alexa Plus, an AI-powered upgrade that promises a smarter, more conversational, and proactive voice assistant.

Alexa+, Amazon’s revamped version of Alexa was unveiled Wednesday, bringing the popular voice assistant into the artificial intelligence era.

Anthropic's Claude large language model is powering the majority of complex tasks for Amazon's new Alexa+, sources tell CNBC.

Amazon says Alexa+ is able to have conversations with a more natural, humanlike flow and can learn more about a user—such as dietary preferences or allergies—the more it’s used.