All Implemented Interfaces:
```
public final class BetaFallbackBlockParam

                    
```
A fallback block echoed back from a prior response.
Accepted in messages[].content and never rendered into the prompt, not validated against the request's fallbacks chain or top-level model, and stripped before the sticky-routing cache key is computed.
Callers should echo the assistant turn verbatim — block included. The block's position is load-bearing for thinking verification: the thinking runs on either side of a fallback hop carry independently-rooted verification hash chains, and this block is the only record of where one chain ends and the next begins. When thinking runs flank the boundary, omitting the block merges the runs into one contiguous span whose hashes cannot verify (the request is rejected), and moving it into the middle of a single run splits that run's chain and is likewise rejected; between non-thinking blocks the block's placement has no verification effect.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`public final class`	`BetaFallbackBlockParam.Builder`	A builder for BetaFallbackBlockParam.

Field Summary

Fields
Modifier and Type	Field	Description

Constructor Summary

Constructors
Constructor	Description

Enum Constant Summary

Enum Constants
Enum Constant	Description

Method Summary

Modifier and Type	Method	Description
`final BetaFallbackInfoParam`	`from()`	Identifies one hop of a fallback transition.
`final BetaFallbackInfoParam`	`to()`	Identifies one hop of a fallback transition.
`final JsonValue`	`_type()`	Expected to always return the following: `JsonValue.from("fallback")` However, this method can be useful for debugging and logging (e.g.
`final JsonField<BetaFallbackInfoParam>`	`_from()`	Returns the raw JSON value of from.
`final JsonField<BetaFallbackInfoParam>`	`_to()`	Returns the raw JSON value of to.
`final Map<String, JsonValue>`	`_additionalProperties()`
`final BetaFallbackBlockParam.Builder`	`toBuilder()`
`final BetaFallbackBlockParam`	`validate()`	Validates that the types of all values in this object match their expected types recursively.
`final Boolean`	`isValid()`
`Boolean`	`equals(Object other)`
`Integer`	`hashCode()`
`String`	`toString()`
`final static BetaFallbackBlockParam.Builder`	`builder()`	Returns a mutable builder for constructing an instance of BetaFallbackBlockParam.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
- Method Detail
  - from
```
 final BetaFallbackInfoParam from()
```
    Identifies one hop of a fallback transition.
  - to
```
 final BetaFallbackInfoParam to()
```
    Identifies one hop of a fallback transition.
  - _type
```
 final JsonValue _type()
```
    Expected to always return the following:
    JsonValue.from("fallback")
    However, this method can be useful for debugging and logging (e.g. if the server responded with an unexpected value).
  - _from
```
 final JsonField<BetaFallbackInfoParam> _from()
```
    Returns the raw JSON value of from.
    Unlike from, this method doesn't throw if the JSON field has an unexpected type.
  - _to
```
 final JsonField<BetaFallbackInfoParam> _to()
```
    Returns the raw JSON value of to.
    Unlike to, this method doesn't throw if the JSON field has an unexpected type.
  - _additionalProperties
```
 final Map<String, JsonValue> _additionalProperties()
```
  - toBuilder
```
 final BetaFallbackBlockParam.Builder toBuilder()
```
  - validate
```
 final BetaFallbackBlockParam validate()
```
    Validates that the types of all values in this object match their expected types recursively.
    This method is not forwards compatible with new types from the API for existing fields.
  - isValid
```
 final Boolean isValid()
```
  - equals
```
 Boolean equals(Object other)
```
  - hashCode
```
 Integer hashCode()
```
  - toString
```
 String toString()
```
  - builder
```
 final static BetaFallbackBlockParam.Builder builder()
```
    Returns a mutable builder for constructing an instance of BetaFallbackBlockParam.
    The following fields are required:
    .from() .to()

Class BetaFallbackBlockParam

Nested Class Summary

Field Summary

Constructor Summary

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Method Detail

from

to

_type

_from

_to

_additionalProperties

toBuilder

validate

isValid

equals

hashCode

toString

builder