OpenAI debuts Voice Engine, which lets users generate synthetic copy of a voice from a 15-second sample, available to around 100 partners, including HeyGe. In other words, it's not available to the public just yet.
https://techcrunch.com/2024/03/29/openai-custom-voice-engine-preview/
Gee, I wonder why! See above in thread for another treatment of this news.
OpenAI holds back wide release of voice-cloning tech due to misuse concerns
Voice Engine can clone voices with 15 seconds of audio, but OpenAI is warning of potential misuse.