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Cosine Similarity Threshold 0.8: Embedding Anisotropy Broke My RAG

My RAG bot had exactly one safety rule: if the best chunk scores below 0.8 cosine similarity, answer "I don't know." That cosine similarity threshold ran for months without complaint. Then I swapped the embedding model, redeployed, and the bot said "I don't know" to everything. Including "how do I…

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  1. 2026-10-11 16:55 · DEV Community — Machine Learning
    Cosine Similarity Threshold 0.8: Embedding Anisotropy Broke My RAG

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