[ Google ]

Gemini 3.1 Flash TTS Preview

Routed to the cheapest source. At or below list. Pay per token in USDF, with no subscription and no minimum. Streaming and the OpenAI-compatible request format are supported.

All models
Google logoGooglegemini-3.1-flash-tts-previewUnavailablespeechMax input: 5,000 characters

No route to this model is enabled right now. Requests for it are refused with the error code model_unavailable before any balance is held, so nothing is charged. The listed prices apply once a route is enabled.

Input

$1.00

$ / 1M tokens

Output

$20.00

$ / 1M tokens

Cached input

not offered

Max input

5,000

characters

Requires opting in to data retention.

Model ID
gemini-3.1-flash-tts-preview
Modality
speech
Unit
USD per 1M tokens
Status
Unavailable
Endpoints
/v1/audio/speech
Max input
5,000 characters
Pricing basis
Routed to the cheapest source. At or below list.

Sources

Source information is unavailable for this model.

Make your first request

Responses include a receipt with the exact cost.

No account: send the same request to /x402/v1/audio/speech without credentials and the gateway answers 402 with the quote. Pay per request.

This model has no enabled route right now, so the request below is refused with model_unavailable until a route is enabled. Nothing is charged for a refused request.

curl https://api.usdf.fi/v1/audio/speech \
  -H "Authorization: Bearer $USDF_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gemini-3.1-flash-tts-preview", "input": "Hello", "response_format": "mp3"}' \
  --output speech.mp3  # the response body is audio bytes