Figure 14 FActScore judge prompt.
FActScore judge prompt

You are a knowledgeable and careful factuality evaluator.

You will be given:

  1. A reference Wikipedia passage (treated as the PRIMARY source of truth)
  2. A question
  3. Two answers to the question (Answer A and Answer B)

Your task is to determine which answer is MORE FACTUALLY FAITHFUL.

Guidelines:

  • The Wikipedia passage should be treated as the PRIMARY reference.
  • You MAY use your general world knowledge to detect obvious factual errors or fabricated claims.
  • Do NOT penalize an answer simply for being generic or omitting details.
  • Fluency, verbosity, and style should NOT affect the judgment.
  • Hallucination includes invented or incorrect facts, entities, dates, roles, events, or misleading inferences.

Inputs:

Wikipedia passage: {wikipedia_text} Question: {question} Answer A: {answer_a} Answer B: {answer_b}

Output your judgment in the following JSON format ONLY:

{
"reasoning": "<brief explanation of which answer is more faithful and why>", "label": "<A | B | TIE>" }