language benchmark
BIG-Bench Extra Hard
BIG-Bench Extra Hard (BBEH) is a challenging benchmark that replaces each task in BIG-Bench Hard with a novel task that probes similar reasoning capabilities but exhibits significantly increased difficulty. The benchmark contains 23 tasks testing diverse reasoning skills including many-hop reasoning, causal understanding, spatial reasoning, temporal arithmetic, geometric reasoning, linguistic reasoning, logic puzzles, and humor understanding. Designed to address saturation on existing benchmarks where state-of-the-art models achieve near-perfect scores, BBEH shows substantial room for improvement with best models achieving only 9.8-44.8% average accuracy.
Updated Aug 11, 2026
Models11
Model coverage11
MetricScore
EvidenceB
BIG-Bench Extra Hard Ranking
Higher score ranks better on this benchmark.
| 1 | GO | 74.4% | 100.0% | 11 | C | |
| 2 | GO | 64.8% | 90.0% | 11 | C | |
| 3 | GO | 53.0% | 80.0% | 11 | C | |
| 4 | GO | 47.6% | 70.0% | 11 | C | |
| 5 | GO | 33.1% | 60.0% | 11 | C | |
| 6 | GO | 21.9% | 50.0% | 11 | C | |
| 7 | GO | 19.3% | 40.0% | 11 | C | |
| 8 | GO | 16.3% | 30.0% | 11 | C | |
| 9 | GO | 15.0% | 20.0% | 11 | C | |
| 10 | GO | 11.0% | 10.0% | 11 | C | |
| 11 | GO | 7.2% | 0.0% | 11 | C |
BIG-Bench Extra Hard Score Distribution
A closer view of the leading scores on this benchmark.
BIG-Bench Extra Hard Highlights
The leading models and scores on this benchmark.
What is BIG-Bench Extra Hard?
What BIG-Bench Extra Hard measures and how its scores work.
BIG-Bench Extra Hard (BBEH) is a challenging benchmark that replaces each task in BIG-Bench Hard with a novel task that probes similar reasoning capabilities but exhibits significantly increased difficulty. The benchmark contains 23 tasks testing diverse reasoning skills including many-hop reasoning, causal understanding, spatial reasoning, temporal arithmetic, geometric reasoning, linguistic reasoning, logic puzzles, and humor understanding. Designed to address saturation on existing benchmarks where state-of-the-art models achieve near-perfect scores, BBEH shows substantial room for improvement with best models achieving only 9.8-44.8% average accuracy.
Scores are shown in ratio. This benchmark is not independently verified and has an evidence level of B.
- Family
- BIG-Bench Extra Hard
- Modality
- text
- Primary category
- language
- Score direction
- higher
- LLMBoard eligible
- Yes
- Evaluation key
- big-bench-extra-hard|llm-stats-current
Benchmark scores retain their original unit. Overall score eligibility is shown separately.
FAQ
Common questions about BIG-Bench Extra Hard.
Which model scores highest on BIG-Bench Extra Hard?
Gemma 4 31B is currently ranked first with 74.4%.
What does BIG-Bench Extra Hard measure?
BIG-Bench Extra Hard (BBEH) is a challenging benchmark that replaces each task in BIG-Bench Hard with a novel task that probes similar reasoning capabilities but exhibits significantly increased difficulty. The benchmark contains 23 tasks testing diverse reasoning skills including many-hop reasoning, causal understanding, spatial reasoning, temporal arithmetic, geometric reasoning, linguistic reasoning, logic puzzles, and humor understanding. Designed to address saturation on existing benchmarks where state-of-the-art models achieve near-perfect scores, BBEH shows substantial room for improvement with best models achieving only 9.8-44.8% average accuracy.
Is a higher score better?
Yes. Higher values rank better for this benchmark.
How many models are compared?
11 model results are currently shown.
Does this benchmark affect the overall score?
Yes. This benchmark can contribute to the current LLMBoard capability score.