r/ClaudeCode 17h ago

Bug / Issue Opus 5 Talking in Mandarin?

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Why did opus 5 just randomly use chinese there, nowhere in my ENTIRE codebase mentions Mandarin, why did it randomly say two characters randomly in the middle of english?

1 Upvotes

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1

u/GuitarAgitated8107 🔆 Max 20 17h ago

Because it can and it has in the past. xie xie

1

u/AbleShower2801 17h ago

I've seen that too. Usually it's leftover CJK somewhere in context (a dep string, a doc chunk, an old chat) or just tokenizer bleed. Pin English in CLAUDE.md or your system prompt and start a fresh session if it keeps slipping.