I'm learning Finnish. For the most part, Gemini and ChatGPT do a much better job at generating passable if sightly Internet-inflected Finnish than I'm likely to anyway within the next 5 years, so I just talk with those.

I would imagine Dutch to be in the same camp, unless a native Dutch speaker reviews some of your conversations and tells you otherwise. My native Finnish wife has given me the marginal all-clear with the vanilla models.

What are some of the prompts you use?