I guess it might depend on language, but as a Spanish speaker who sometimes uses LLMs in Spanish, I'd say the gap between GPT-4 and most of the competition (Mistral included) is actually larger in Spanish than in English.

In my experience it’s not such a simple question. If you want to be able to speak in nuanced non-English and have it pick up on the intricacies, or have it respond in rich correct non-English, then it’s not the best model (Cohere recently released an aya model that I would recommend checking out if this is your use case).

If you want to be able to give basic commands and have the model reason about the logic behind your commands, gpt 4 is still the best, even in minority languages.

gpt4 is going to better than other models in every language except maybe chinese

From what I heard Gemini might be better at translation tasks than GPT4.

It's the best multilingual model out there and it's not even close.

Especially in terms of open models Mistral's are the most multilingual but outside a few handpicked ones the level of proficiency is just too poor for any real usage.