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How do you measure faithfulness (hallucination rate) in a RAG system, and what makes it hard to score?

An answer can be correct and still unfaithful, stating things the retrieved context never said. The signal is scoring faithfulness against the context, not against truth, and knowing why LLM-judge faithfulness scores drift.

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An answer can be correct and still unfaithful, stating things the retrieved context never said. The signal is scoring faithfulness against the context, not against truth, and knowing why LLM-judge faithfulness scores drift.

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