Portuguese is my mother tongue. I’ve tried ChatGPT, GPT 4, Claude, local LLMs, etc and they all produce inaccurate results that I still have to edit a lot. They also can’t remember well if a character is male or female. It feels like they all have the same capabilities as Google Translate, which as far as I know, isn’t an AI.
As far as I tried this kind of things, it works well in French.
And I think there is more French than Portuguese in the majority of training data sets, so it might be related?