[pzo]

Interesting for me Open TTS for Polish was better than Google TTS (but they have few options) - which one did you used? WaveNet?

Sadly haven't seen quality evaluation for TTS for foreign languages

[fixprix]

Depends on what's available for the language, but yea Wavenet and Neural2. With OpenAI TTS I'd often get weird bugs where the first API call comes back all garbled, but the second API call comes back fine. Wasting money. On top of that more expensive and higher latency. I'm interested to try out this new one.