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Following Length Constraints in Instructions

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arxiv 2406.17744 v1 pith:QTXJ4YD2 submitted 2024-06-25 cs.CL

classification cs.CL
keywords modelslengthfollowingbiasconstraintsinstructioninstructionsalgorithms
verification ladder T0 review T1 audit T2 compute T3 formal
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Aligned instruction following models can better fulfill user requests than their unaligned counterparts. However, it has been shown that there is a length bias in evaluation of such models, and that training algorithms tend to exploit this bias by learning longer responses. In this work we show how to train models that can be controlled at inference time with instructions containing desired length constraints. Such models are superior in length instructed evaluations, outperforming standard instruction following models such as GPT4, Llama 3 and Mixtral.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Test-Time Scaling via Error Localization

    cs.LG 2026-07 conditional novelty 6.0 of 10

    TTEL uses feedback-induced token probability drops to localize the first error in a failed reasoning trace and branch a new generation from that prefix, improving pass@k per token on coding and math benchmarks.

  2. Revisiting the Reliability of Language Models in Instruction-Following

    cs.SE 2025-12 conditional novelty 6.0 of 10

    LLMs exhibit up to 61.8% performance drops on nuanced rephrasings of instruction-following tasks, revealing insufficient nuance-oriented reliability across 46 tested models.

  3. Med-U1: Incentivizing Unified Medical Reasoning in LLMs via Large-scale Reinforcement Learning

    cs.CL 2025-06 conditional novelty 6.0 of 10

    A pure reinforcement learning recipe with mixed rule-based rewards and length control improves Qwen2.5-based models across diverse medical QA formats.

  4. LIFEBench: Evaluating Length Instruction Following in Large Language Models

    cs.CL 2025-05 conditional novelty 6.0 of 10

    LIFEBench's evaluation of 26 LLMs shows most follow short length instructions but degrade sharply beyond a few hundred words, and none reliably hit vendor-claimed maximum output lengths.

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