Whisper is speech-to-text. VibeVoice is text-to-speech.

There is a text-to-speech version of whisper, but IMHO the quality is much worse than the demos of this model.

Are you referring to this?

https://github.com/WhisperSpeech/WhisperSpeech

Or is there some OpenAI official Whisper TTS?

Yep, nothing official that I know, but that one is fairly popular so maybe they were referring to it (although AFAIK it's not frontier?)

I stand corrected