KeyoAPI

Gemini Flash TTS API on KeyoAPI — Low-Latency Speech

Gemini 3.1 Flash TTS Preview for controllable, low-latency speech on the same OpenAI-compatible key as chat.

Listed price: ~$0.40 / $8.00 per 1M in/out · Confirm live on interactive pricing.

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Overview

gemini-3.1-flash-tts-preview is Gemini Flash text-to-speech on KeyoAPI. Indicative rates about $0.40 / $8.00 per 1M in/out — confirm live on /pricing/gemini-3.1-flash-tts-preview. Call POST /v1/audio/speech at https://www.keyoapi.xyz/v1 and receive audio in the same response (sync). Use IndexTTS-2 or CosyVoice3 when you already run async TTS jobs.

Quick start

Base URL: https://www.keyoapi.xyz/v1

Endpoint: POST /v1/audio/speech

Model: model=gemini-3.1-flash-tts-preview

curl https://www.keyoapi.xyz/v1/audio/speech \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gemini-3.1-flash-tts-preview","input":"Hello from Gemini Flash TTS.","voice":"Kore"}' \
  --output speech.wav

Auth uses the same Bearer API key as chat. Full notes: Keyo docs.

FAQ

Sync or async?

Sync: POST /v1/audio/speech returns audio. Async TTS on Keyo remains Qwen3-TTS / CosyVoice3.

Where is live pricing?

See /pricing/gemini-3.1-flash-tts-preview. Indicative ~$0.40 / $8.00 per 1M in/out.

Related models

IndexTTS-2 API CosyVoice3 API Suno Music API

Guide for gemini-3.1-flash-tts-preview. Try/buy: /pricing/gemini-3.1-flash-tts-preview · Catalog: /pricing.