lefft/needleif-bench

needleif-bench A judge-free, NIAH-style long-context control benchmark with hidden verifiable instructions. The "needle" (lifted from IFEval) is hidden inside long distractor prose (the "haystack"). The model must find the instruction and follow it — testing long-context retrieval and instruction following at once, with deterministic, model-free scoring. It exists to measure capability regression (catastrophic forgetting) after task-specific fine-tuning: run it on a model before… See the full description on the dataset page: https://huggingface.co/datasets/lefft/needleif-bench.

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