Glitch: Specific Prompts Cause Claude Opus to Leak Chain of Thought
matthen2 · x · 2026-07-30
A user discovered that sending specific prompt formats (like “see the below —”) to Claude 3 Opus triggers an unusual response.
Instead of replying normally, the model leaks its internal antml thinking syntax and hallucinates a user request to complete. This unexpected behavior offers an interesting case for studying LLM safety boundaries and internal mechanisms.
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