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[GH-ISSUE #12438] [model] Qwen3:4b Still "Thinks" When "think" in the Interface Is Set to False #54774

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opened 2026-04-29 07:17:14 -05:00 by GiteaMirror · 5 comments
GiteaMirror commented 2026-04-29 07:17:14 -05:00
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Originally created by @pinghe on GitHub (Sep 28, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/12438

What is the issue?

Qwen3:4b still engages in "thinking" even when the "think" parameter in the interface is set to false.

Relevant log output

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Originally created by @pinghe on GitHub (Sep 28, 2025). Original GitHub issue: https://github.com/ollama/ollama/issues/12438 ### What is the issue? Qwen3:4b still engages in "thinking" even when the "think" parameter in the interface is set to false. ### Relevant log output ```shell ``` ### OS _No response_ ### GPU _No response_ ### CPU _No response_ ### Ollama version _No response_
GiteaMirror added the bug label 2026-04-29 07:17:14 -05:00
GiteaMirror commented 2026-04-29 07:17:17 -05:00
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@rick-github commented on GitHub (Sep 28, 2025):

Use the non-thinking version: https://ollama.com/library/qwen3:4b-instruct-2507-q4_K_M

<!-- gh-comment-id:3343285896 --> @rick-github commented on GitHub (Sep 28, 2025): Use the non-thinking version: https://ollama.com/library/qwen3:4b-instruct-2507-q4_K_M
GiteaMirror commented 2026-04-29 07:17:18 -05:00
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@somnifex commented on GitHub (Sep 29, 2025):

Check the API you are using; in my tests, the 'think' field is invalid when using the OpenAI compatible API, and you need to use the native Ollama API.

<!-- gh-comment-id:3344618362 --> @somnifex commented on GitHub (Sep 29, 2025): Check the API you are using; in my tests, the 'think' field is invalid when using the OpenAI compatible API, and you need to use the native Ollama API.
GiteaMirror commented 2026-04-29 07:17:18 -05:00
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@pinghe commented on GitHub (Sep 30, 2025):

The ollama-js client library and its ollama.chat interface are utilized. Both the qwen3:8b and qwen3:1.7b models can normally respond to the setting of the think parameter, while only the qwen3:4b model fails to do so.

<!-- gh-comment-id:3350552364 --> @pinghe commented on GitHub (Sep 30, 2025): The ollama-js client library and its ollama.chat interface are utilized. Both the qwen3:8b and qwen3:1.7b models can normally respond to the setting of the think parameter, while only the qwen3:4b model fails to do so.
GiteaMirror commented 2026-04-29 07:17:19 -05:00
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@somnifex commented on GitHub (Sep 30, 2025):

The ollama-js client library and its ollama.chat interface are utilized. Both the qwen3:8b and qwen3:1.7b models can normally respond to the setting of the think parameter, while only the qwen3:4b model fails to do so.

The latest Qwen3:4B model no longer uses mixed reasoning; instead, it offers separate instruct and think models. The default model is think. You need to download the instruct model, as described by the user above.

<!-- gh-comment-id:3350561744 --> @somnifex commented on GitHub (Sep 30, 2025): > The ollama-js client library and its ollama.chat interface are utilized. Both the qwen3:8b and qwen3:1.7b models can normally respond to the setting of the think parameter, while only the qwen3:4b model fails to do so. The latest Qwen3:4B model no longer uses mixed reasoning; instead, it offers separate instruct and think models. The default model is think. You need to download the instruct model, as described by the user above.
GiteaMirror commented 2026-04-29 07:17:19 -05:00
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@pinghe commented on GitHub (Sep 30, 2025):

thanks

<!-- gh-comment-id:3351695967 --> @pinghe commented on GitHub (Sep 30, 2025): thanks
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