OutputMessagePhaseUnion Type | OpenRouter Go SDK | OpenRouter

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

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

OutputMessagePhaseCommentary

1 outputMessagePhaseUnion := components.CreateOutputMessagePhaseUnionOutputMessagePhaseCommentary(components.OutputMessagePhaseCommentary{/* values here */})

OutputMessagePhaseFinalAnswer

1 outputMessagePhaseUnion := components.CreateOutputMessagePhaseUnionOutputMessagePhaseFinalAnswer(components.OutputMessagePhaseFinalAnswer{/* values here */})

1 outputMessagePhaseUnion := components.CreateOutputMessagePhaseUnionAny(any{/* values here */})

Union Discrimination

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

1 switch outputMessagePhaseUnion.Type {
2 	case components.OutputMessagePhaseUnionTypeOutputMessagePhaseCommentary:
3 		// outputMessagePhaseUnion.OutputMessagePhaseCommentary is populated
4 	case components.OutputMessagePhaseUnionTypeOutputMessagePhaseFinalAnswer:
5 		// outputMessagePhaseUnion.OutputMessagePhaseFinalAnswer is populated
6 	case components.OutputMessagePhaseUnionTypeAny:
7 		// outputMessagePhaseUnion.Any is populated
8 }