Gemini 3.1 Flash TTS (preview) · impossibl

Gemini 3.1 Flash TTS (preview) is Google's text-to-speech model in the Gemini 3.1 family, generating natural, low-latency speech from text prompts. It adds expressive audio tags for precise narration control alongside steerable prompts and improved naturalness, controllability, and multilingual support over earlier Gemini TTS models.

Base model All models on this base All models of the provider to the provider

Input, $/1M $1.00

Output, $/1M $20.00

Context —

Accepts text

Last checked 04.11.2026 12:00:14 UTC

Source provider's page

Price alerts

API

OpenAI-compatible API: the official OpenAI SDKs work with this base URL. Replace YOUR_API_KEY with your key from the provider.

API base URL	`https://api.impossibl.com/v1`
Endpoint	`https://api.impossibl.com/v1/audio/speech`
Model id	`google/gemini-3.1-flash-tts-preview`

curl

curl https://api.impossibl.com/v1/audio/speech \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "google/gemini-3.1-flash-tts-preview", "input": "Hello!", "voice": "alloy"}'

Python

import requests

r = requests.post(
    "https://api.impossibl.com/v1/audio/speech",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={
      "model": "google/gemini-3.1-flash-tts-preview",
      "input": "Hello!",
      "voice": "alloy"
    },
)
print(r.json())

JavaScript

const r = await fetch("https://api.impossibl.com/v1/audio/speech", {
  method: "POST",
  headers: {Authorization: "Bearer YOUR_API_KEY", "Content-Type": "application/json"},
  body: JSON.stringify({
    "model": "google/gemini-3.1-flash-tts-preview",
    "input": "Hello!",
    "voice": "alloy"
  }),
});
console.log(await r.blob());

Request (JSON)

{
  "model": "google/gemini-3.1-flash-tts-preview",
  "input": "Hello!",
  "voice": "alloy"
}

Response (JSON)

audio bytes (audio/mpeg)

The address is taken from the provider's model list; check it against the provider's documentation.

Provider's API documentation

Source: AI Rate Card, https://airatecard.com/en/c/offer%3Aimpossibl%7Cgoogle/gemini-3.1-flash-tts-preview, prices checked 2026-11-04; seller's page: https://impossibl.com/models/google/gemini-3.1-flash-tts-preview

Technical details

ID: offer:impossibl|google/gemini-3.1-flash-tts-preview