Research across eleven open-source models shows that constrained decoding does not inherently degrade reasoning performance. Degradation often results from non-equivalent prompting and output formats rather than the constraints themselves, which can actually improve performance by eliminating invalid paths.
HOW THIS AFFECTS YOU
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builderYou can use constrained decoding to enforce formats without fearing significant reasoning loss if you adjust your prompting.
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researcherThis challenges the assumption that output constraints automatically hurt model intelligence.