The start-up is sharing the technology, Voice Engine, with a small group of early testers as it tries to understand the potential dangers.

First, OpenAI offered a tool that allowed people to create digital images simply by describing what they wanted to see. Then, it built similar technology that generated full-motion video like something from a Hollywood movie.

Now, it has unveiled technology that can recreate someone’s voice.

The high-profile A.I. start-up said on Friday that a small group of businesses was testing a new OpenAI system, Voice Engine, that can recreate a person’s voice from a 15-second recording. If you upload a recording of yourself and a paragraph of text, it can read the text using a synthetic voice that sounds like yours.