Xinhua says the presenters can "work" 24 hours a day on its website and social media channels, "reducing news production costs".
The agency points out that they may be particularly useful for disseminating breaking news reports in a timely manner.
An artificial intelligence (AI) system has been used to synthesise the presenters' voices, lip movements and expressions. They are based on those of real Xinhua presenters.
Full story: https://www.bbc.com/news/technology-46136504