Go SDKAPI ReferenceModels

MessagesFallbackParam - Go SDK

MessagesFallbackParam type definition

The Go SDK and docs are currently in beta. Report issues on GitHub.

Fallback model to try when the primary model fails or refuses. Only the model field is supported; per-attempt overrides are rejected.

Fields

FieldTypeRequiredDescriptionExample
Modelstring✔️N/A
AdditionalPropertiesmap[string]any➖N/A{"model": "claude-opus-4-8"}