← All modelsAsk about SDK access ↗
OpenAI · Speech
TTS-1 HD
Higher-quality OpenAI text to speech.
Contact Synal ↗tts-1-hdModel specifications
- Capabilities
- tts
- Family
- TTS
- Provider
- openai
USDC · x402
The call price
- Per 1M characters
- $30.900000
Plus 0.001000 USDC per call.
exact payments authorize a fixed quote before the call. The server quotes the units for your request.
Price verified: 2026-10-14 UTC.
Payment guarantees ↗Make an API call
This first request returns an HTTP 402 quote. An x402 client signs an accepted offer and retries with its payment authorization.
Replace VOICE_ID with a voice supported by this model.
curl · Get a payment quote
curl https://synal-gateway.fly.dev/x402/v1/audio/speech \
-H 'Content-Type: application/json' \
-d '{
"model": "tts-1-hd",
"input": "Hello from Synal.",
"voice": "VOICE_ID"
}'