feat: Support Magistral Small 2509 reasoning tags #6474

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opened 2025-11-11 16:56:20 -06:00 by GiteaMirror · 2 comments
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Originally created by @MattBash17 on GitHub (Sep 23, 2025).

Check Existing Issues

  • I have searched the existing issues and discussions.

Problem Description

Magistral 2509 generates internal reasoning between the [THINK]...[/THINK] tags, instead of the common ... ones. Would it be possible to add support for the correct visualization in the UI?

Desired Solution you'd like

A correct reasonining visualization in the UI, or the option to specify the reasoning section parsing (per model) like LM Studio does.

Alternatives Considered

No response

Additional Context

No response

Originally created by @MattBash17 on GitHub (Sep 23, 2025). ### Check Existing Issues - [x] I have searched the existing issues and discussions. ### Problem Description Magistral 2509 generates internal reasoning between the [THINK]...[/THINK] tags, instead of the common <think>...</think> ones. Would it be possible to add support for the correct visualization in the UI? ### Desired Solution you'd like A correct reasonining visualization in the UI, or the option to specify the reasoning section parsing (per model) like LM Studio does. ### Alternatives Considered _No response_ ### Additional Context _No response_
Author
Owner

@tjbck commented on GitHub (Sep 23, 2025):

You should be able to specify custom reasoning tags!

@tjbck commented on GitHub (Sep 23, 2025): You should be able to specify custom reasoning tags!
Author
Owner

@kermorvan commented on GitHub (Sep 28, 2025):

Solution

  • Click the User icon (top right corner) > Settings > Admin Settings (bottom left of "Settings" popup) > Models > hf.co/unsloth/Magistral-Small-2509-GGUF:UD-Q3_K_XL > Advanced Params (Show) > Reasoning Tags

  • Change from "Default" to [THINK] and [/THINK]

  • Save & Update

@kermorvan commented on GitHub (Sep 28, 2025): ## Solution - Click the User icon (top right corner) > Settings > Admin Settings (bottom left of "Settings" popup) > Models > hf.co/unsloth/Magistral-Small-2509-GGUF:UD-Q3_K_XL > Advanced Params (Show) > Reasoning Tags - Change from "Default" to [THINK] and [/THINK] - Save & Update
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Reference: github-starred/open-webui#6474