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

Giving Alexa the power of generative AI was already expected to be the star announcement from Amazon -- and it was. During the last Devices and Services event in 2023, Amazon announced a gen AI-powered 'Alexa+' or Alexa Plus and a new user interface coming to an Echo device near you, and the company is now making it more real than ever before.

Amazon on Wednesday unveiled the first major overhaul of its Alexa voice assistant since its introduction more than a decade ago, embedding it with generative artificial intelligence.

Some of the new abilities coming to Alexa Plus include the ability to do things for you — you’ll be able to ask it to order groceries for you or send event invites to your friends. Amazon says it will also be able to memorize personal details like your diet and movie preferences.

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

But unlike before, when Alexa was offered for free on any Alexa-enabled devices, customers will have to pay Amazon a monthly fee of $19.99 for the revamped voice assistant, which it calls “Alexa+”. However, the generative-AI powered Alexa will be free for Prime members, who pay the company a monthly or annual fee for free delivery and other perks.

At an event in New York on Wednesday, Amazon announced an upgraded Alexa experience — Alexa+ — powered by generative AI technologies. Onstage, Amazon’s devices and services chief Panos Panay called it a “complete re-architecture” of the AI assistant.

There's one major shift in the way Amazon is approaching its next-gen Alexa, and it's got nothing to do with AI