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When “Measuring Meaning” Measures Nothing: The Cosine Similarity Trap in Hallucination Detection

By Nat Smith | Systems fail. People glitch. I write. · Published March 23, 2026 · 1 min read · Source: Level Up Coding
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When “Measuring Meaning” Measures Nothing: The Cosine Similarity Trap in Hallucination Detection

Three failure modes of cosine similarity in RAG pipelines, with the code that actually works and the statistical reasoning underneath.

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