When talking to DeepSeek R1, the first time you ask it something in a non-english language its thought process is in the correct language, but the thought process for all subsequent responses is in English, which could affect the response.
https://kagi.com/assistant/c0e6f8cc-b6d0-451d-9e7f-2ad8ee9fe4ef
Here I first asked "what's two plus two" in Russian, and R1 thought about it in Russian. But for my subsequent question, "what about three plus three", the thought process is in English, and includes the following part:
Make sure the response is in Russian as the previous one. Yes, the user is using Russian, so the answer should be in the same language.
The thought process of R1 should always be in the correct language