> ## 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.

# MessagesMessageParam

Anthropic message with OpenRouter extensions

## Fields

| Field | Type | Required | Description | Example |
| - | - | - | - | - |
| `ClearAt` | optionalnullable.OptionalNullable\[[components.AnthropicSystemClearAt](../../models/components/anthropicsystemclearat.mdx)] | :heavy\_minus\_sign: | N/A | next\_user\_message |
| `Content` | [components.MessagesMessageParamContentUnion5](../../models/components/messagesmessageparamcontentunion5.mdx) | :heavy\_check\_mark: | N/A | |
| `OutputConfig` | optionalnullable.OptionalNullable\[[components.AnthropicMessageOutputConfig](../../models/components/anthropicmessageoutputconfig.mdx)] | :heavy\_minus\_sign: | N/A | \{<br />"effort": "low"<br />} |
| `Role` | [components.MessagesMessageParamRole](../../models/components/messagesmessageparamrole.mdx) | :heavy\_check\_mark: | N/A | |