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}
}

info@nalandadata.ai · nalandadata.ai

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