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LongBench Synthetic V3

Dataset statistics

Per-subset stats over uploaded samples. Unique ctx counts distinct context strings, while the context-length buckets count samples/rows. Token counts use Qwen/Qwen3-14B.

Pool Subset Unique ctx Sample rows <8K 8-16K 16-32K >32K Median tok p90 tok Max tok
eval 2wikimqa 197 197 139 54 4 0 6,627 13,271 16,982
eval gov_report 200 200 89 84 24 3 8,902 18,212 52,521
eval musique 200 200 3 46 151 0 16,733 17,231 17,824
eval qasper 148 200 187 10 3 0 4,674 7,469 21,879
eval qmsum 35 200 40 108 52 0 12,970 25,539 30,377
eval samsum 200 200 88 104 8 0 9,215 14,930 17,987
train hotpotqa 200 1,600 216 880 504 0 14,982 16,947 17,578
train hotpotqa_e 288 2,304 928 1,120 256 0 9,693 16,530 17,322
train multi_news 199 1,592 1,552 40 0 0 2,048 4,834 14,278
train multi_news_e 282 2,256 1,336 736 152 32 6,768 15,226 41,048
train multifieldqa_en 112 896 504 384 8 0 7,712 12,004 16,446
train narrativeqa 20 160 0 48 48 64 31,296 60,327 65,301
train triviaqa 200 1,600 536 680 384 0 11,530 19,600 23,284
train triviaqa_e 299 2,392 1,184 856 344 8 8,289 17,669 36,186

Train pool: 1,600 unique contexts → 12,800 question rows (split into HF train + validation). Eval pool: 980 unique contexts → 1,197 question rows (uploaded as HF test).

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