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

# ReasoningMode

Selects the reasoning mode. `standard` is the default; `pro` engages deeper reasoning on models that support it, billed at standard token rates. Only supported by OpenAI GPT-5.6 and newer.

## Example Usage

```go theme={null}
import (
	"github.com/OpenRouterTeam/go-sdk/models/components"
)

value := components.ReasoningModeStandard

// Open enum: custom values can be created with a direct type cast
custom := components.ReasoningMode("custom_value")
```

## Values

| Name                    | Value    |
| ----------------------- | -------- |
| `ReasoningModeStandard` | standard |
| `ReasoningModePro`      | pro      |