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reasoning benchmark

FActScore

A fine-grained atomic evaluation metric for factual precision in long-form text generation that breaks generated text into atomic facts and computes the percentage supported by reliable knowledge sources, with automated assessment using retrieval and language models

Updated Aug 11, 2026

Models2
Model coverage2
MetricScore
EvidenceB

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  • Distribution
  • Highlights
  • About
  • FAQ

FActScore Ranking

Higher score ranks better on this benchmark.

2 rows
Columns

Show columns

01XAGrok-4.1xAI97.0%100.0%2CAug 11, 2026
02OPGPT-5OpenAI1.0%0.0%2CAug 11, 2026

FActScore Score Distribution

A closer view of the leading scores on this benchmark.

FActScore

FActScore Highlights

The leading models and scores on this benchmark.

Rank #1Grok-4.197.0%Rank #2GPT-51.0%

What is FActScore?

What FActScore measures and how its scores work.

A fine-grained atomic evaluation metric for factual precision in long-form text generation that breaks generated text into atomic facts and computes the percentage supported by reliable knowledge sources, with automated assessment using retrieval and language models

Scores are shown in ratio. This benchmark is not independently verified and has an evidence level of B.

Family
FActScore
Modality
text
Primary category
reasoning
Score direction
higher
LLMBoard eligible
No
Evaluation key
factscore|llm-stats-current

Benchmark scores retain their original unit. Overall score eligibility is shown separately.

FAQ

Common questions about FActScore.

Which model scores highest on FActScore?

Grok-4.1 is currently ranked first with 97.0%.

What does FActScore measure?

A fine-grained atomic evaluation metric for factual precision in long-form text generation that breaks generated text into atomic facts and computes the percentage supported by reliable knowledge sources, with automated assessment using retrieval and language models

Is a higher score better?

Yes. Higher values rank better for this benchmark.

How many models are compared?

2 model results are currently shown.

Does this benchmark affect the overall score?

No. This benchmark is shown for reference but does not contribute to the overall score.