> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# MessagesOutputConfigFormat - Python SDK

> MessagesOutputConfigFormat method reference

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

A schema to specify Claude's output format in responses. See [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs).

## Fields

| Field     | Type                                                                                                                             | Required             | Description |
| --------- | -------------------------------------------------------------------------------------------------------------------------------- | -------------------- | ----------- |
| `schema_` | Dict\[str, *Nullable\[Any]*]                                                                                                     | :heavy\_check\_mark: | N/A         |
| `type`    | [components.MessagesOutputConfigTypeJSONSchema](/client-sdks/python/api-reference/components/messagesoutputconfigtypejsonschema) | :heavy\_check\_mark: | N/A         |