Reasoning modes
Control how the chatbot reasons through questions with three modes: Auto, Instant, and Think.

Available modes
| Mode | Description | Interactions per question |
|---|---|---|
| Auto (default) | Balances speed and quality. The system determines the appropriate reasoning depth. | 1 |
| Instant | Fast answers for simple questions and quick lookups. | 1 |
| Think | Deep reasoning for complex technical questions. Takes longer but more accurate. | 4-8 |
Enable reasoning modes
important
Only Administrator or Maintainer roles can manage projects. See Manage roles.
- In the Biel.ai dashboard, select your project.
- Click Settings.
- Under LLM Settings, check Enable think mode.
- Click Save.

Once enabled, users can select their preferred mode from the settings icon in the chat widget header. The selection persists across page reloads.
Widget attributes
Control reasoning mode behavior with these <biel-button> attributes:
| Attribute | Default | Description |
|---|---|---|
think-mode-enabled | false | Set Think mode as the default instead of Auto. |
hide-settings-button | false | Hide the settings button so users can't change the mode. |
Set Think mode as default:
<biel-button
project="my-project"
think-mode-enabled="true"
>Ask AI</biel-button>
Force Think mode for all questions
Combine both attributes to always use Think mode without letting users change it. This increases interaction usage by 4-8x per question.
<biel-button
project="my-project"
think-mode-enabled="true"
hide-settings-button="true"
>Ask AI</biel-button>