위험한 오리들; "안전 필터"는 엉터리다
Dangerous Ducks; “Safety Filter” is a Quack
핵심 요약
Claude의 안전 필터가 단어의 의미가 아닌 텍스트의 일관성과 통계적 패턴에 따라 무해한 내용을 차단함을 분석함.
- 안전 필터의 오작동 — 특정 단어가 아닌 문장의 일관성이 낮을 때 필터가 작동하는 현상을 발견함.
- 통계적 패턴 매칭 — 의미 없는 단어 나열도 위협적인 언어 패턴과 유사하면 시스템이 차단함.
- 모델 공통 메커니즘 — Opus와 Sonnet 등 여러 모델에서 동일한 필터링 로직이 확인됨.
- 낮은 일관성의 위험성 — 문법이 파괴된 입력이 안전 분류기를 자극하여 오탐을 유발함.
It’s not about the actual words.
SEE MAJOR UPDATE AT BOTTOM
TL;DR: It’s not the meaning, it’s not even “unsafe words”, it’s COHERENCE.
I saw the thread about Opus 4.8 flagging an innocent fabric/moisture-trapping question. I started swapping the suspicious-sounding words (“vapour,” “substance,” etc.) for “duck” and “goose,” and it still got flagged. I wanted to figure out what was actually triggering it, so I kept pushing the test further. Here’s what I found…
I reproduced the same flag on Sonnet 4.6. So whatever this is, it’s not isolated to one model tier.
It’s not about the content of the words!
I replaced every word in the original “fabric/moisture” prompt with nonsense (duck, goose, quack). None of the actual “suspect” words (vapour, substance, hydrophobic, etc.) turned out to matter, a string of literal gibberish about ducks and geese still got flagged. Whatever is firing here doesn’t seem to care about meaning.
It’s not a personalization or user-preferences issue.
I re-ran the test on a separate free account with no saved user preferences, to rule out anything tied to my account history or settings. Same result. And it’s not a Claude Code/CLAUDE.md thing. This was all done in the iOS app, not Claude Code, and there’s no project-level instructions file involved.
The trigger point is weirdly unstable.
Once I had the prompt reduced to just a handful of “duck”/“quack” repetitions, I started swapping or deleting individual words and punctuation one at a time. Sometimes removing a single comma stopped the flag. Sometimes swapping one “duck” for “quack” stopped it, other times an almost identical edit kept it flagged, or made Claude just respond that I was making a joke about duck noises. There’s no consistent pattern I could find at the margin, even though the entire string is already meaningless.


