AnalysisDevelopersOctober 26, 2026

vLLM 0.31 constrained decoding fixes tool-call schema accuracy

Read original source →ubicloud.com

Serving Kimi K2.6 on vLLM 0.28 produced the expected tool-call schema only 92% of the time — 2 in 25 calls failed. vLLM 0.31 adds a server-side constrained-decoding flag that reaches 100% schema accuracy with newer Kimi and DeepSeek models.

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