> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# InputsPhaseUnion - Go SDK

> InputsPhaseUnion type definition

<Warning>
  The Go SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/go-sdk/issues).
</Warning>

The phase of an assistant message. Use `commentary` for an intermediate assistant message and `final_answer` for the final assistant message. For follow-up requests with models like `gpt-5.3-codex` and later, preserve and resend phase on all assistant messages. Omitting it can degrade performance. Not used for user messages.

## Supported Types

### InputsPhaseCommentary

```go lines theme={null}
inputsPhaseUnion := components.CreateInputsPhaseUnionInputsPhaseCommentary(components.InputsPhaseCommentary{/* values here */})
```

### InputsPhaseFinalAnswer

```go lines theme={null}
inputsPhaseUnion := components.CreateInputsPhaseUnionInputsPhaseFinalAnswer(components.InputsPhaseFinalAnswer{/* values here */})
```

###

```go lines theme={null}
inputsPhaseUnion := components.CreateInputsPhaseUnionAny(any{/* values here */})
```

## Union Discrimination

Use the `Type` field to determine which variant is active, then access the corresponding field:

```go lines theme={null}
switch inputsPhaseUnion.Type {
	case components.InputsPhaseUnionTypeInputsPhaseCommentary:
		// inputsPhaseUnion.InputsPhaseCommentary is populated
	case components.InputsPhaseUnionTypeInputsPhaseFinalAnswer:
		// inputsPhaseUnion.InputsPhaseFinalAnswer is populated
	case components.InputsPhaseUnionTypeAny:
		// inputsPhaseUnion.Any is populated
}
```