> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# SpeechInput

Text to synthesize, or a list of turns for multi-speaker input. Each turn has its own text, voice, and instructions. Multi-speaker input is supported by Gemini TTS models and by Fish Audio models other than S1.

## Supported Types

###

```go theme={null}
speechInput := components.CreateSpeechInputStr(string{/* values here */})
```

###

```go theme={null}
speechInput := components.CreateSpeechInputArrayOfSpeechTurn([]components.SpeechTurn{/* values here */})
```

## Union Discrimination

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

```go theme={null}
switch speechInput.Type {
	case components.SpeechInputTypeStr:
		// speechInput.Str is populated
	case components.SpeechInputTypeArrayOfSpeechTurn:
		// speechInput.ArrayOfSpeechTurn is populated
}
```