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Half way through an English answer DeepSeek started putting Chinese characters in. Not the whole thing, just random words. Bug?
Why Is DeepSeek Suddenly Adding Chinese Characters to English Responses?
1 Answer
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Known quirk, especially in the reasoning mode. It was trained heavily on both languages and sometimes it drifts, usually when the topic is technical or the answer is long.
Just say "Respond in English only" at the top of your prompt. If you're on the API, put it in the system prompt, that sticks better. If it slips mid-reply, "continue in English" gets it back on track.
If you're running it in some automated pipeline, add a quick check for non-Latin characters in the output and retry when you find any. Cheap insurance.
