> ## 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

```typescript theme={null}
import { ReasoningMode } from "@openrouter/sdk/models";

let value: ReasoningMode = "standard";

// Open enum: unrecognized values are captured as Unrecognized<string>
```

## Values

```typescript theme={null}
"standard" | "pro" | Unrecognized<string>
```