Claude Code Bug: Opus 5.5 Replies in English From First Turn Despite Korean CLAUDE.md Rule
dochigun-nc · ghdev · 2026-11-05
A Claude Code issue reports a language-adherence bug: with a Korean global CLAUDE.md whose first rule is "always answer in Korean", Opus 5.5 answered the very first message entirely in English in a fresh session — with only 75K tokens of context, ruling out long-session drift.
English kept leaking back even after 5 explicit corrections in one session, often after reading English reference docs or tool output. The model once noticed its English reply and apologized — in English. Even an AskUserQuestion call came out in English, and an auto-memory note about the leak was in context from the start yet didn't prevent it. The author quantified per-turn Hangul share from session JSONL as evidence.
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