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Qwen 3.8 27B's default xhigh reasoning setting causes the model to dramatically over-think even trivial prompts, wasting tokens and time.
The model defaults to xhigh reasoning, which causes absurd over-thinking on simple tasks. The author strongly recommends using low or no reasoning to start. ✦ AI generated
Simon Willison · Simon Willison's Weblog · 2026-08-16 · original ↗
Qwen's documentation describes the model as defaulting to xhigh for the reasoning effort, and the LM Studio GGUF I've been trying preserves that default: xhigh (default): for complex tasks demanding thorough analysis [...] This is a hilarious default. It's absolutely not a good way to run the model, especially on consumer hardware. [...] My strong recommendation: ignore that default. Run Qwen 3.8 27B on low or even no reasoning levels at first.
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- ·Defaults to xhigh reasoning setting in documentation
- ·LM Studio GGUF preserves this xhigh default
- ·Causes absurd over-thinking on simple tasks
- ·Wastes tokens and processing time on consumer hardware
- ·Strongly recommends ignoring xhigh default setting
- ·Use low or no reasoning levels initially
- ·Better performance on consumer hardware
- ·Avoids token waste on trivial prompts
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