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RAG and QWED address different failure modes. RAG improves what the model can reference. QWED verifies whether the model’s final claim or action is correct.

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Core difference

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When RAG is enough

Use RAG when the model needs:
  • Access to private documents
  • Recent facts or changing policies
  • Better grounding from source material

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When you need QWED

Use QWED when the model must:
  • Produce correct calculations from retrieved data
  • Obey policy and approval rules
  • Verify tool calls before execution
  • Prevent prompt injection from turning retrieved context into unsafe actions

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Best-practice stack

Use both together:
  1. RAG retrieves the relevant documents.
  2. QWED verifies the answer, decision, or action derived from those documents.