I’m really just relying on OpenAI’s models for now, and supporting the same 65 languages GPT-4o supports. Was there a particular language you’re interested in that you’ve found the models produce disappointing results?

Well I study Ukrainian and was just curious why it's missing, since it's on the supported list for both whisper and OpenAI TTS. I can't find a list of languages supported by GPT-4o anywhere in the release materials or API documents. It's not in GPT-4 technical report either.

I'm native in Finnish and would say that 4o writes sort of ok Finnish but definitely makes many mistakes. I'd imagine many of the languages on the list of supported ones are worse.

I see I have mistakenly omitted Ukrainian from the App Store description, but it is definitely supported in the app. I can't speak to its quality, but I would be interested to hear what you think.