> ## 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.
# MessagesOutputConfig
Configuration for controlling output behavior. Supports the effort parameter and structured output format.
## Fields
| Field | Type | Required | Description | Example |
| ------------- | --------------------------------------------------------------------------------------------------------- | -------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------- |
| `effort` | [OptionalNullable\[components.MessagesOutputConfigEffort\]](../components/messagesoutputconfigeffort.mdx) | :heavy\_minus\_sign: | How much effort the model should put into its response. Higher effort levels may result in more thorough analysis but take longer. Valid values are `low`, `medium`, `high`, `xhigh`, or `max`. | medium |
| `format_` | [OptionalNullable\[components.MessagesOutputConfigFormat\]](../components/messagesoutputconfigformat.mdx) | :heavy\_minus\_sign: | A schema to specify Claude's output format in responses. See [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs). | |
| `task_budget` | [OptionalNullable\[components.TaskBudget\]](../components/taskbudget.mdx) | :heavy\_minus\_sign: | Task budget for an agentic turn. The model sees a countdown of remaining tokens and uses it to prioritize work and wind down gracefully. Advisory — does not enforce a hard cap. | \{
"total": 400000,
"type": "tokens"
} |