Datasets:
license: cc-by-nc-4.0
task_categories:
- question-answering
language:
- en
tags:
- reasoning
- mathematics
- physics
- chemistry
- jee
- failure-analysis
- contamination-aware
size_categories:
- n<1K
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NULLSPACE
267 JEE questions frontier models get wrong — every answer key independently verified, every row tagged for contamination. This is a 10-row sample. Access is auto-approved — fill in your details to view the data.
Full dataset (267 questions · 77 held out): Nalandadata/NULLSPACE — requires access request.
NULLSPACE is a failure-only benchmark. A question enters the set only when multiple frontier models independently get it wrong and the answer key has been re-verified. Each row carries a do_not_score field listing models that must be excluded when scoring — because those models' failures were used to build the set, scoring them on it measures nothing. Clean accuracy (67.3%) is higher than overall accuracy (62.2%) because contaminated rows are the ones models specifically struggled with.
Sample coverage
| item_id | Subject | Answer type | Figures |
|---|---|---|---|
| STEM-0001 | Mathematics | multiple_choice | 0 |
| STEM-0002 | Chemistry | single_choice | 5 |
| STEM-0003 | Chemistry | matrix_match | 4 |
| STEM-0004 | Chemistry | numerical | 0 |
| STEM-0005 | Mathematics | multiple_choice | 0 |
| STEM-0006 | Physics | integer | 0 |
| STEM-0008 | Chemistry | multiple_choice | 5 |
| STEM-0010 | Physics | single_choice | 1 |
| STEM-0015 | Mathematics | single_choice | 0 |
| STEM-0020 | Chemistry | integer | 1 |
Schema (14 columns)
| Field | Meaning |
|---|---|
item_id |
Stable public identifier, STEM-NNNN |
exam, subject, answer_type |
Source and question format |
question, options, column_a/column_b |
Question content with HTML/MathML |
answer, answer_key |
The key — plain string and structured object |
do_not_score |
Models that must be excluded when scoring this row |
models_failed |
Which models got this question wrong |
verdict |
CONFIRMED_MODEL_FAILURE, DISPUTED_BUT_KEY_BACKED, DISPUTED |
thumbnail |
First figure image (Image type), null for text-only |
Citation
@misc{nullspace2026,
title = {NULLSPACE: A Failure-Only JEE Benchmark with Contamination Tracking},
author = {Nalandadata},
year = {2026},
howpublished = {\url{https://huggingface.co/datasets/Nalandadata/NULLSPACE}},
note = {267 public questions; 77 held out}
}