language benchmark
BIG-Bench Hard
BIG-Bench Hard (BBH) is a subset of 23 challenging BIG-Bench tasks selected because prior language model evaluations did not outperform average human-rater performance. The benchmark contains 6,511 evaluation examples testing various forms of multi-step reasoning including arithmetic, logical reasoning (Boolean expressions, logical deduction), geometric reasoning, temporal reasoning, and language understanding. Tasks require capabilities such as causal judgment, object counting, navigation, pattern recognition, and complex problem solving.
Updated Aug 11, 2026
Models21
Model coverage21
MetricScore
EvidenceB
BIG-Bench Hard Ranking
Higher score ranks better on this benchmark.
| 01 | AN | 93.1% | 100.0% | 21 | C | |
| 02 | AN | 93.1% | 95.0% | 21 | C | |
| 03 | GO | 89.2% | 90.0% | 21 | C | |
| 04 | GO | 87.6% | 85.0% | 21 | C | |
| 05 | AN | 86.8% | 80.0% | 21 | C | |
| 06 | GO | 85.7% | 75.0% | 21 | C | |
| 07 | GO | 85.5% | 70.0% | 21 | C | |
| 08 | AN | 82.9% | 65.0% | 21 | C | |
| 09 | MI | 79.1% | 60.0% | 21 | C | |
| 10 | AN | 73.7% | 55.0% | 21 | C | |
| 11 | GO | 72.2% | 50.0% | 21 | C | |
| 12 | MI | 70.4% | 45.0% | 21 | C | |
| 13 | IB | 69.1% | 40.0% | 21 | C | |
| 14 | IB | 69.1% | 35.0% | 21 | C | |
| 15 | MI | 69.0% | 30.0% | 21 | C | |
| 16 | IB | 55.7% | 25.0% | 21 | C | |
| 17 | GO | 52.9% | 20.0% | 21 | C | |
| 18 | GO | 52.9% | 15.0% | 21 | C | |
| 19 | GO | 44.3% | 10.0% | 21 | C | |
| 20 | GO | 44.3% | 5.0% | 21 | C | |
| 21 | GO | 39.1% | 0.0% | 21 | C |
BIG-Bench Hard Score Distribution
A closer view of the leading scores on this benchmark.
BIG-Bench Hard Highlights
The leading models and scores on this benchmark.
What is BIG-Bench Hard?
What BIG-Bench Hard measures and how its scores work.
BIG-Bench Hard (BBH) is a subset of 23 challenging BIG-Bench tasks selected because prior language model evaluations did not outperform average human-rater performance. The benchmark contains 6,511 evaluation examples testing various forms of multi-step reasoning including arithmetic, logical reasoning (Boolean expressions, logical deduction), geometric reasoning, temporal reasoning, and language understanding. Tasks require capabilities such as causal judgment, object counting, navigation, pattern recognition, and complex problem solving.
Scores are shown in ratio. This benchmark is not independently verified and has an evidence level of B.
- Family
- BIG-Bench Hard
- Modality
- text
- Primary category
- language
- Score direction
- higher
- LLMBoard eligible
- Yes
- Evaluation key
- big-bench-hard|llm-stats-current
Benchmark scores retain their original unit. Overall score eligibility is shown separately.
FAQ
Common questions about BIG-Bench Hard.
Which model scores highest on BIG-Bench Hard?
Claude 3.5 Sonnet is currently ranked first with 93.1%.
What does BIG-Bench Hard measure?
BIG-Bench Hard (BBH) is a subset of 23 challenging BIG-Bench tasks selected because prior language model evaluations did not outperform average human-rater performance. The benchmark contains 6,511 evaluation examples testing various forms of multi-step reasoning including arithmetic, logical reasoning (Boolean expressions, logical deduction), geometric reasoning, temporal reasoning, and language understanding. Tasks require capabilities such as causal judgment, object counting, navigation, pattern recognition, and complex problem solving.
Is a higher score better?
Yes. Higher values rank better for this benchmark.
How many models are compared?
21 model results are currently shown.
Does this benchmark affect the overall score?
Yes. This benchmark can contribute to the current LLMBoard capability score.