factuality benchmark
LongFact Leaderboard
LongFact evaluates factual precision in long-form generations containing many individual claims.
Updated Sep 5, 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 | Score98.00% | Percentile100.00% | 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 original unit. The leaderboard ranking keeps matched price and speed data separate from benchmark evidence.
- 01MIMicrosoft
- Score
- 98.00%
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 98.00%. 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 is a factuality benchmark that extracts and verifies individual claims in long-form model responses.
It measures claim-level precision: whether extended responses introduce unsupported or false statements, reported as a ratio using the Score metric.
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
- overall
LLM Stats. 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 98.00%.
What are the top three models on LongFact?
The current leaders are MAI-Thinking-1 (98.00%).
Which LongFact model has the lowest official input price?
No matched official input price is currently available.
Which models are fastest among LongFact results?
No matched runtime record is currently available.
Does the highest score result prove overall model quality?
No. This benchmark measures one defined capability or task. The overall LLMBoard score uses a separate aggregation across eligible benchmark evidence.