Gemini 3.1 Flash TTS Preview is Google's text-to-speech model, released 2026-04, a substantial step up from Gemini 2.5 Flash TTS. It covers 70+ languages and introduces 200+ inline audio tags for steering delivery, emotion, and pacing mid-sentence. The model supports two speakers with independent voice and style configuration, outputs 24 kHz / 16-bit mono PCM, and watermarks output with SynthID.
Modalities
inTextoutAudio
Price / 1M−5%
$0.95 / $19.00$1.00 / $20.00
Context
33K
Knowledge cutoff
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Capabilities
Structured output
Channels
Same weights on every channel. Requests route to the cheapest healthy one; the channel used is printed on each billing line.
Provider
Discount
Input /M
Output /M
Cache Read /M
Cache Create 5m /M
Cache Create 1h /M
Defaultstable
−5%
$0.95
$19.00
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Quick Start
import os from openai import OpenAI client = OpenAI( base_url="https://api.mirapi.ai/v1", # changed api_key=os.environ["MIRAPI_API_KEY"], # changed ) resp = client.chat.completions.create( model="google/gemini-3.1-flash-tts-preview", messages=[{"role": "user", "content": "Hello"}], )
import OpenAI from "openai"; const client = new OpenAI({ baseURL: "https://api.mirapi.ai/v1", // changed apiKey: process.env.MIRAPI_API_KEY, // changed }); const res = await client.chat.completions.create({ model: "google/gemini-3.1-flash-tts-preview", messages: [{ role: "user", content: "Hello" }], });
curl https://api.mirapi.ai/v1/chat/completions \ -H "Authorization: Bearer $MIRAPI_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "google/gemini-3.1-flash-tts-preview", "messages": [{"role": "user", "content": "Hello"}] }'
Links
Wire Gemini 3.1 Flash TTS Preview into your product
Start free1M free tokens to start · no card · OpenAI-compatible, one base_url change