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Fixing Tool-Call Accuracy in vLLM


Tool call accuracy is an important part of serving open-weight AI models. When your tool calls aren’t accurate, the model builds up on nonsensical context. We’ve been carrying our own fork of vLLM to hit 100% in tool call schema accuracy with Kimi and DeepSeek. Fortunately, vLLM 0.31 added support for constrained decoding, a technique to guarantee schema-adherence. By enabling it, you can get to 100% schema accuracy with the newer Kimi and DeepSeek models.

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