ResearchResearch paperLarge Language Models1 source · Oct 14, 2026

ReFormBench: Benchmarking the Stability of Response-Conditioned Format Correction in Large Language Models

We introduce ReFormBench, a benchmark that uses each model's unconstrained response to the same question as its formatting baseline.

Key points

  • Reliable use of large language models requires responses to satisfy formatting requirements across changing instructions.
  • Standard compliance scores do not distinguish preserving a model's observed format from correcting it, or reveal whether that correction holds across variants.
  • A prompting experiment on Qwen3.5-9B improves both metrics, and the catalog covers over 95% of extracted instances on four additional models.
  • ReFormBench makes response-conditioned correction across instruction variants a measurable dimension of format following.

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