# OpenRouter APIs — Google: Gemini 3.8 Flash Lite TTS (google/gemini-3.8-flash-lite-tts)

Guide for calling every confirmed OpenRouter API that serves `google/gemini-3.8-flash-lite-tts`.

Model page: https://openrouter.ai/google/gemini-3.8-flash-lite-tts
Create an API key: https://openrouter.ai/settings/keys

## Pricing

Standard-variant prices for `google/gemini-3.8-flash-lite-tts`, per provider, in the unit each provider bills (tokens, images, seconds of video, or characters of audio). Pay-as-you-go with no markup on the provider's price.

- Google AI Studio: $0.50/M tokens input, $6/M tokens output
- Google Vertex: $0.50/M tokens input, $6/M tokens output

Full price table, including other variants and per-request charges: https://openrouter.ai/google/gemini-3.8-flash-lite-tts
How OpenRouter prices requests: https://openrouter.ai/pricing

## EU in-region routing

`google/gemini-3.8-flash-lite-tts` is not currently available through EU in-region routing.

Docs: https://openrouter.ai/docs/guides/features/in-region-routing

## Authentication

Send this header with every request:

- Authorization: Bearer $OPENROUTER_API_KEY

## Text-to-Speech API

Synthesize audio with `google/gemini-3.8-flash-lite-tts` through OpenRouter's Text-to-Speech API.

Docs: https://openrouter.ai/docs/api/api-reference/tts/create-speech

### Endpoint

POST https://openrouter.ai/api/v1/audio/speech

Headers:
- Content-Type: application/json

### Request fields (google/gemini-3.8-flash-lite-tts)

- model: string (required) — `"google/gemini-3.8-flash-lite-tts"`
- input: string (required) — text to synthesize
- voice: "Zephyr" | "Puck" | "Charon" | "Kore" | "Fenrir" | "Leda" | "Orus" | "Aoede" | "Callirrhoe" | "Autonoe" | "Enceladus" | "Iapetus" | "Umbriel" | "Algieba" | "Despina" | "Erinome" | "Algenib" | "Rasalgethi" | "Laomedeia" | "Achernar" | "Alnilam" | "Schedar" | "Gacrux" | "Pulcherrima" | "Achird" | "Zubenelgenubi" | "Vindemiatrix" | "Sadachbia" | "Sadaltager" | "Sulafat" (optional) — provider-specific voice identifier
- response_format: "mp3" | "pcm" (optional) — output audio encoding; defaults to pcm

### Response

Success returns raw audio bytes, not JSON.

- `Content-Type` identifies the audio encoding, such as `audio/mpeg` or `audio/pcm`.
- `X-Generation-Id` identifies the billed generation.
- Write the response body directly to an audio file; do not call `response.json()`.

### Examples

#### Synthesize speech

```bash
curl https://openrouter.ai/api/v1/audio/speech \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  --output output.pcm \
  -d '{
  "model": "google/gemini-3.8-flash-lite-tts",
  "input": "Hello! This is a text-to-speech test.",
  "voice": "Zephyr"
}'
```

### Error differences

- 400 — malformed audio input or an audio option the routed provider does not support
- 502 — the upstream audio operation failed

## Errors

Failures return `{"error": {"code": <number>, "message": <string>}}` with the HTTP status:

- 400 — malformed request or an unsupported parameter
- 401 — missing or invalid API key
- 402 — insufficient credits
- 403 — spend limit reached, key disabled, or access blocked
- 404 — unknown model or no provider can serve the request
- 429 — rate limited; retry with backoff
- 502 — the operation failed upstream; failed generations are not billed

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Canonical version of this document: https://openrouter.ai/google/gemini-3.8-flash-lite-tts/llms.txt