> ## 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.

# OpenAIResponseInputMessageItemRoleUnion - TypeScript SDK

> OpenAIResponseInputMessageItemRoleUnion type definition

<Warning>
  The TypeScript SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/typescript-sdk/issues).
</Warning>

## Supported Types

### `models.OpenAIResponseInputMessageItemRoleUser`

```typescript lines theme={null}
const value: models.OpenAIResponseInputMessageItemRoleUser = "user";
```

### `models.OpenAIResponseInputMessageItemRoleSystem`

```typescript lines theme={null}
const value: models.OpenAIResponseInputMessageItemRoleSystem = "system";
```

### `models.OpenAIResponseInputMessageItemRoleDeveloper`

```typescript lines theme={null}
const value: models.OpenAIResponseInputMessageItemRoleDeveloper = "developer";
```