# Constrained Decoding: Harmful or Beneficial? Revisiting Its Impact on LLM Performance

> Source: <https://aiflash.com/news/140363/>
> Published: 2026-10-27 11:00:33+00:00

Constrained decoding guarantees that Large Language Models (LLMs) produce outputs conforming to predefined formats, but is often assumed to inherently degrade reasoning. We examine this assumption through a taxonomy of three constraint types: format constraints, which enforce output structure; valid