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feat: Support Magistral Small 2509 reasoning tags #6474
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Originally created by @MattBash17 on GitHub (Sep 23, 2025).
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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
@tjbck commented on GitHub (Sep 23, 2025):
You should be able to specify custom reasoning tags!
@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]
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