[KongchangAI]
Unverified50% confidenceFactExact time

Sub-string match is a widely adopted automated metric in open-domain question answering evaluation, where a generated answer is considered correct if it contains the ground-truth answer string as a substring, making it more lenient than exact match.

1
Sources
50%
Confidence
Long-term
Relevance
9/22/2026
First Seen

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