Gemini 3.1 Flash TTS¶

What it is¶

Gemini 3.1 Flash TTS is a next-generation text-to-speech model from Google, designed for low latency and high expressiveness. It is part of the Gemini 3.1 model family.

What problem it solves¶

It provides a way to generate high-quality, expressive AI speech with minimal latency, making it suitable for real-time applications and interactive AI assistants.

Where it fits in the stack¶

AI & Knowledge / Generative Audio. It serves as the speech synthesis layer for multimodal AI applications.

Typical use cases¶

Interactive Assistants: Real-time voice interaction with LLM-based agents.
Content Creation: Generating voiceovers for videos or articles.
Accessibility: Providing high-quality audio versions of text content.

Strengths¶

Low Latency: Optimized for fast response times.
Expressiveness: Capable of generating natural-sounding speech with varied prosody.
Integration: Part of the broader Google Gemini ecosystem.

Limitations¶

Proprietary: Access is controlled by Google via their APIs.
Cost: Usage-based pricing in AI Studio or Vertex AI.

When to use it¶

When you need low-latency, high-quality speech synthesis within the Google ecosystem.
For interactive voice applications where responsiveness is critical.

When not to use it¶

If your application requires a fully open-source or self-hosted TTS solution.
For tasks where simple, non-expressive speech is sufficient and cost is the primary concern.

Getting started¶

API Examples (Google AI Studio)¶

You can use the gemini-1.5-flash (or newer) endpoints for TTS tasks.

Python Snippet¶

import os
import google.generativeai as genai

genai.configure(api_key="YOUR_API_KEY")

model = genai.GenerativeModel('gemini-1.5-flash')
# Note: Check the latest documentation for specific TTS-dedicated model strings
# or generative audio parameters.

# Experimental audio generation
response = model.generate_content("Generate speech for: 'Hello, welcome to the future of TTS.'")
# Save or stream the response.audio data

cURL Example¶

curl https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent?key=$GOOGLE_API_KEY \
    -H 'Content-Type: application/json' \
    -X POST \
    -d '{
      "contents": [{
        "parts":[{"text": "Synthesize this text into a warm, professional voice."}]
      }]
    }'

Sources / References¶

Contribution Metadata¶

Last reviewed: 2026-06-27
Confidence: high