I believe one of the best ways to learn a language is to use it every day. However, it can be hard to incorporate a new language into your life at the beginning. You simply don't know it well enough to chat online and read news. This leaves you with rather boring learning materials. I've tried to solve this problem with LLM chatbots, and so far, the results are rather encouraging!

DuckDuckGo, a privacy-friendly alternative to Google and other search providers, has recently launched a new product: AI Chat. It offers anonymous access to popular AI models, including GPT-3.5, Claude 3, and open-source Llama 3 and Mixtral. While I cannot make a reliable assessment of their claims, using this service allows you to work with these models without registration, which is a good starting point.

I decided to compare them to ChatGPT 4o. There are many ways to do this, but I didn't aim to make a professional and thorough comparison. As a user of these tools, I wanted to see how they could handle my daily requests. Since I am learning German, sometimes I need to clarify certain words, phrases, or how to apply different cases in various situations.

The prompt was inspired by my mistake on Duolingo. To put it simple, I thought that the German "in" was equivalent to the English "to". However, it turned out that "in" can change its meaning depending on the case.

Let's see how various LLMs explained the difference.