BLiMP: The Benchmark of Linguistic Minimal Pairs for English
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Abstract (arXiv)
We introduce The Benchmark of Linguistic Minimal Pairs (shortened to BLiMP), a challenge set for evaluating what language models (LMs) know about major grammatical phenomena in English. BLiMP consists of 67 sub-datasets, each containing 1000 minimal pairs isolating specific contrasts in syntax, morphology, or semantics. The data is automatically generated according to expert-crafted grammars, and aggregate human agreement with the labels is 96.4%. We use it to evaluate n-gram, LSTM, and Transformer (GPT-2 and Transformer-XL) LMs. We find that state-of-the-art models identify morphological contrasts reliably, but they struggle with semantic restrictions on the distribution of quantifiers and negative polarity items and subtle syntactic phenomena such as extraction islands.
Key facts. Cited by 564 papers in the map (data through 14 Oct 2026). First posted on arXiv 2 Dec 2019.
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Citing papers per year: 2021: 44; 2022: 44; 2023: 80; 2024: 88; 2025: 152; 2026: 156.
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