> ## 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 |
| --------- | --------------------------------------------------------------------------------------------------- | -------------------- | ----------- |
| `content` | [components.MessagesMessageParamContentUnion5](../components/messagesmessageparamcontentunion5.mdx) | :heavy\_check\_mark: | N/A         |
| `role`    | [components.MessagesMessageParamRole](../components/messagesmessageparamrole.mdx)                   | :heavy\_check\_mark: | N/A         |