Where to edit model so that no_think is the default

[cameronj86]

Thanks

[wellkilo]

On current Jan builds you can make this a per-model default from the chat input:

1. Select the model.
2. Open the brain/Reasoning menu beside the prompt.
3. Choose Off.

Jan persists that choice in the model's settings and, for llama.cpp models, sends this on each request:

{"chat_template_kwargs":{"enable_thinking":false}}

Auto omits the option and lets the model's chat template decide; On sends true.

If your older Jan version does not have that Reasoning menu, /no_think is only a per-prompt soft switch for Qwen-style templates. In that case update Jan, or set chat_template_kwargs.enable_thinking=false in the API request/model configuration if your backend exposes it.

The current default is auto, and the three persisted choices are defined in predefined.ts. The request mapping is in custom-chat-transport.ts.