I sometimes vibe code in polish and it's as good as with English for me. It speaks a natural, native level Polish.
I used opus to translate thousands of strings in my app into polish, Korean, and two Chinese dialects.
Polish one is great, and the other are also good according to my customers.
This is interesting to me. I always switch to English automatically when using Claude Code as I have learned software engineering on an English speaking Internet. Plus the muscle memory of having to query google in English.
I sometimes vibe code in polish and it's as good as with English for me. It speaks a natural, native level Polish.
I used opus to translate thousands of strings in my app into polish, Korean, and two Chinese dialects. Polish one is great, and the other are also good according to my customers.