Gemini 3.1 Flash TTS Preview

Gemini 3.1 Flash TTS Preview is a text-to-speech model from Google. Call gemini-3.1-flash-tts-preview through MixRoute’s native Gemini endpoint.

Key capabilities

Text-to-speech - Convert text into generated audio
Voice selection - Configure a prebuilt voice
Audio output - Returns generated speech data

Quick example

cURL
Python

curl "https://api.mixroute.ai/v1/models/gemini-3.1-flash-tts-preview:generateContent" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "contents": [
    {
      "parts": [
        {
          "text": "Say clearly: Welcome to MixRoute."
        }
      ]
    }
  ],
  "generationConfig": {
    "responseModalities": [
      "AUDIO"
    ],
    "speechConfig": {
      "voiceConfig": {
        "prebuiltVoiceConfig": {
          "voiceName": "Kore"
        }
      }
    }
  }
}'

import requests

response = requests.post(
    "https://api.mixroute.ai/v1/models/gemini-3.1-flash-tts-preview:generateContent",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={'contents': [{'parts': [{'text': 'Say clearly: Welcome to MixRoute.'}]}],
          'generationConfig': {'responseModalities': ['AUDIO'],
                               'speechConfig': {'voiceConfig': {'prebuiltVoiceConfig': {'voiceName': 'Kore'}}}}},
)

print(response.json())

Parameters

Parameter	Type	Required	Description
`contents`	array	Yes	Text content to speak.
`generationConfig.responseModalities`	array	Yes	Set to AUDIO.
`generationConfig.speechConfig`	object	Yes	Voice configuration.

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Model Introduction

Gemini 3.1 Flash TTS Preview

Key capabilities

Quick example

Parameters

​Key capabilities

​Quick example

​Parameters

Key capabilities

Quick example

Parameters