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openrouter-python-sdk-retry…/docs/components/messagesfallbackparam.mdx
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---
title: "MessagesFallbackParam"
---
Fallback model to try when the primary model fails or refuses. Only the `model` field is supported; per-attempt overrides are rejected.
## Fields
| Field | Type | Required | Description | Example |
| ------------------------------ | ------------------------------ | ------------------------------ | ------------------------------ | ------------------------------ |
| `model` | *str* | :heavy_check_mark: | N/A | |
| `__pydantic_extra__` | Dict[str, *Nullable[Any]*] | :heavy_minus_sign: | N/A | \{<br/>"model": "claude-opus-4-8"<br/>} |