# ModelFallback

> Tracon documentation. Tracon is a .NET package family that adds a control
> plane on Microsoft Agent Framework, published as NuGet packages that run
> inside your own ASP.NET Core application.
>
> Page: https://tracon.dev/http-api/schemas/modelfallback/
> Summary: OpenAPI request or response schema for ModelFallback, including required fields, defaults, constraints, and linked nested types.

[← All HTTP schemas](/http-api/schemas/)

One link of a IReadOnlyList<ModelFallback> ModelBinding.Fallbacks chain.

**Shape:** `object`

| Property | Required | Type | Description | Rules |
|---|---|---|---|---|
| `provider` | yes | `string` | Gets the provider name, for example `anthropic`. | — |
| `model` | yes | `string` | Gets the model name, for example `claude-opus-5`. | — |