> ## Documentation Index
> Fetch the complete documentation index at: https://opentouter.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Thinking Variant

> Enable extended reasoning with :thinking

The `:thinking` variant enables extended reasoning capabilities for complex problem-solving tasks.

## Usage

Append `:thinking` to any model ID:

```json lines theme={null}
{
  "model": "deepseek/deepseek-r1:thinking"
}
```

## Details

Thinking variants provide access to models with extended reasoning capabilities, allowing for more thorough analysis and step-by-step problem solving. This is particularly useful for complex tasks that benefit from chain-of-thought reasoning.

See also: [Reasoning Tokens](/guides/best-practices/reasoning-tokens)