factuality benchmark
LongFact Leaderboard
LongFact evaluates factual precision over long-form generations containing many individual claims. Each claim is extracted and verified, and the model is scored on claim-level precision, measuring whether extended responses introduce unsupported or false statements.
Updated Aug 17, 2026
Models1
Model coverage1
MetricScore
EvidenceB
LongFact Ranking
Higher score ranks better on this benchmark.
Sort by
Rank | Model | Score | Percentile | Participants | Evidence | Evaluated |
|---|
| Rank01 | ModelMI | Score98.0% | Percentile100.0% | Participants1 | EvidenceC | Evaluated |
LongFact Highlights
The leading models and scores on this benchmark.
The Top AI Models for LongFact
The first five results on this benchmark, with official price and output speed added where the model identity can be matched.
Ranking basisThis longfact AI model leaderboard uses descending score in the benchmark's original unit. The leaderboard ranking keeps matched price and speed data separate from benchmark evidence.
- 01MIMAI-Thinking-1Microsoft
- Score
- 98.0%
Strengths
- Ranks #1 of 1 compared models
- 100th percentile on this benchmark
- C evidence result
Considerations
- This result measures LongFact, not total model capability
Selection summary
Best AI Models for LongFact
MAI-Thinking-1 currently leads LongFact with 98.0%. It is the top model on this specific benchmark, while the best LLM for the broader task should also be checked against other benchmarks, price and runtime.
Use this leaderboard with the supporting benchmark results and coverage details above. A leaderboard position summarizes the selected ranking signal; it does not replace workload-specific testing.
What is LongFact?
What LongFact measures and how its scores work.
LongFact evaluates factual precision over long-form generations containing many individual claims. Each claim is extracted and verified, and the model is scored on claim-level precision, measuring whether extended responses introduce unsupported or false statements.
Scores are shown in ratio. This benchmark is not independently verified and has an evidence level of B.
- Family
- LongFact
- Modality
- text
- Primary category
- factuality
- Score direction
- higher
- LLMBoard eligible
- No
- Evaluation key
- longfact|llm-stats-current
Benchmark scores retain their original unit. Overall score eligibility is shown separately.
FAQ
Common questions about LongFact.
Which model scores highest on LongFact?
MAI-Thinking-1 is currently ranked first with 98.0%.
What does LongFact measure?
LongFact evaluates factual precision over long-form generations containing many individual claims. Each claim is extracted and verified, and the model is scored on claim-level precision, measuring whether extended responses introduce unsupported or false statements.
Is a higher score better?
Yes. Higher values rank better for this benchmark.
How many models are compared?
1 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.