# Gemini 3.1 Flash TTS (Google) — API pricing and providers

> Controllable text to speech. Model id `google/gemini-3.1-flash-tts`. Audio model by Google.

- Page: https://infro.io/models/google/gemini-3.1-flash-tts
- Vendor: Google (https://infro.io/models/google)
- Modality: Audio
- Endpoint through INFRO: `POST /v1/audio/speech` at https://api.infro.io/v1
- List rate: $16 per 1M characters
- Rates checked: 2026-10-05

Rates are Google's published list price: what the customer's own provider account bills, not an INFRO charge. INFRO is a BYOK control plane; it charges a software subscription and adds 0% to model spend.

**Retirement:** Google shuts Gemini 3.1 Flash TTS down on its own API on 17 Nov 2026. Source: https://ai.google.dev/gemini-api/docs/deprecations

## Providers that serve it

| Provider | Model id sent |
| --- | --- |
| Google AI (Gemini) | `gemini-3.1-flash-tts-preview` |
| OpenRouter | `google/gemini-3.1-flash-tts-preview` |

## Questions

### How much does the Gemini 3.1 Flash TTS API cost?

Google's published list rate for Gemini 3.1 Flash TTS is $16 per 1M characters (checked 2026-10-05). The provider account you connect bills you at the rate on that account, so a negotiated rate replaces the list rate. INFRO adds 0% to model spend.

### Which providers serve Gemini 3.1 Flash TTS?

In INFRO's provider registry, Gemini 3.1 Flash TTS can be served by Google AI (Gemini) and OpenRouter. You connect your own account with any of them, and INFRO routes and fails over between the ones you connect.

### What is the Gemini 3.1 Flash TTS model ID?

Request it from INFRO as "google/gemini-3.1-flash-tts". INFRO sends each provider its own id: Google AI (Gemini) "gemini-3.1-flash-tts-preview", OpenRouter "google/gemini-3.1-flash-tts-preview".

### How do I call Gemini 3.1 Flash TTS through an OpenAI-compatible API?

Point an OpenAI SDK, or any HTTP client, at https://api.infro.io/v1 with an INFRO gateway key and send model "google/gemini-3.1-flash-tts" to POST /v1/audio/speech. INFRO runs the request on a provider account you connected and returns the provider's response with an estimated cost.

### Is Gemini 3.1 Flash TTS being retired?

Google shuts Gemini 3.1 Flash TTS down on its own API on 17 Nov 2026.

### Does INFRO mark up Gemini 3.1 Flash TTS usage?

No. Google or the provider you connect bills model usage to your own account. INFRO charges a software subscription for routing, failover, observability, budgets and policy, and takes 0% of model spend.