---
id: "google/gemini-3.1-flash-tts-preview"
also: ["google/gemini-3.1-flash-tts-preview"]
cheapest_list_usd_per_m: "1.0 in, 20.0 out, at google-vertex on openrouter"
cheapest_effective_usd_per_m: "0.9807 in, 20.0 out, at google-vertex/us-central1 on openrouter"
context: 32768
max_output: 16384
input: ["text"]
output: ["speech"]
released: "2026-04-24"
api: ["/api/v1/audio/speech"]
endpoints: 2
gateways: "openrouter (2)"
no_training: 1
trains: 0
retains_prompts: 0
---
# Google: Gemini 3.1 Flash TTS Preview

Gemini 3.1 Flash TTS Preview is a text-to-speech model from Google, and a substantial generational step up from Gemini 2.5 Flash TTS. It takes text input and produces audio output...