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<think> tags inserted for Qwen3.5 0.8B regardless of the reasoning toggle #401

Description

@hlibr

Describe the bug

When using the Qwen3.5 0.8B model, the following behavior is observed:

Regardless of the reasoning toggle state (on or off) in the LLM component, the empty think block always gets appended to the prompt:

Image Image

Qwen3.5 0.8B supports thinking mode, however it is off by default, and can only be enabled by adding "enable_thinking": True to the request's extra_body.

The think block thus does nothing except potentially degrade the performance.

Backtested with Qwen3 0.6B - with that model the think block only gets appended with reasoning off.

LLMUnity version

3.0.3

Operating System

macOs

Activity

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