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User reports Qwen3.6-27B struggles with vLLM, creating custom parser

A user experienced significant performance degradation and functional issues when attempting to run the Qwen3.6-27B model using vLLM, particularly when compared to llama.cpp. Despite having ample VRAM and attempting various model versions and configurations, the user encountered problems such as the model becoming "lobotomized," making frequent tool errors, and getting stuck. The user ultimately resorted to creating a custom Python parser to intercept and manage the model's errors, noting common syntax and bracket-related issues. AI

IMPACT Highlights potential compatibility and performance issues when deploying large language models with different inference frameworks.

RANK_REASON User reporting on performance issues and workarounds for specific models and inference engines.

Read on r/LocalLLaMA →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

User reports Qwen3.6-27B struggles with vLLM, creating custom parser

COVERAGE [1]

  1. r/LocalLLaMA TIER_1 English(EN) · /u/DanielusGamer26 ·

    Qwen3.6 27B more dumb in vLLM compared to llama.cpp

    <!-- SC_OFF --><div class="md"><p>Hello, I recently bought a new RTX 5060Ti to pair with the RTX 5060Ti I already own, now I have 32GB of VRAM.</p> <p>Up until now for convenience I've used llama.cpp, for goodness' sake it works excellently when only 1 user is using it, but now t…