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Speak

Speak - text-to-speech (TTS) that starts in milliseconds.

Speak is PyAI's text-to-speech (TTS) API: low-latency streaming synthesis with 36 stock voices, free instant voice cloning, and prompt-to-voice design. First audio bytes arrive in tens of milliseconds over the same /v1/audio/speech contract your OpenAI client already speaks.

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Price
$0.04/min
Endpoint
POST /v1/audio/speech
Scope
voice:synthesize
Model id
pyai-voice
Async synthesis$0.04/min
Voice cloning (enroll)Free
Voice designFree

Hear it before you build with it.

The box on the right calls the live Speak API. Pick a voice, type a line, and listen.

Open the Playground
Hear it say your words

Want the full thing - Hear, Omni, code export?Open the Playground

What you get

Snappy by default

Audio streams from the first byte (~53 ms warm / ~98 ms cold time-to-first-audio-byte, in-region), so playback starts almost instantly.

Your voice, free to clone

Cloning enrollment and prompt-to-voice design are free, and a cloned voice streams its first audio byte in ~32 ms warm (in-region).

Drop-in OpenAI shape

The same /v1/audio/speech contract, with OpenAI preset voice names mapped to PyAI voices, so existing TTS code runs unchanged.

Capabilities

  • ~53 ms warm TTFB (in-region)
  • 36 stock voices
  • Voice cloning (free)
  • Designed voices (free)
  • Telephony formats (G.711)
  • OpenAI drop-in

Time-to-first-audio-byte ~53 ms warm / ~98 ms cold on the streaming path, measured in-region (first audio byte, not first spoken word); progressive playback the whole way through. Server-side formats (mp3, wav, opus, pcm, and 8 kHz G.711 µ-law/A-law) mean telephony callers skip the resampler and µ-law encoder.

Start in minutes

cURL
curl https://api.pyai.com/v1/audio/speech \
  -H "Authorization: Bearer $PYAI_KEY" \
  -d '{"model":"pyai-voice","input":"Hello from PyAI.","voice":"stock_ava_en_us"}' \
  --output hello.mp3

FAQ

What is Speak?

Speak is PyAI's text-to-speech (TTS) API. It turns text into natural speech over a low-latency streaming path, with 36 stock voices, free voice cloning, and prompt-to-voice design. It speaks the OpenAI /v1/audio/speech contract, so it's a drop-in replacement for OpenAI TTS.

How much does Speak TTS cost?

Voice cloning enrollment and prompt-to-voice design are free - you pay only for the audio you synthesize, billed per minute. Check our pricing page for the latest rates.

How do I migrate from OpenAI TTS?

Point your existing OpenAI SDK at https://api.pyai.com/v1 with your PyAI key. The /v1/audio/speech request shape matches, and the OpenAI preset voice names (alloy, echo, fable, onyx, nova, shimmer) are accepted and map to PyAI stock voices - so most code runs unchanged.

How many voices are there?

36 stock voices today, plus your own cloned voices and prompt-designed voices. Browse the live catalog at GET /v1/voices, or pass an OpenAI preset name for drop-in compatibility.

What does voice cloning cost?

Cloning enrollment is free, as is prompt-to-voice design. You pay only for the audio you later synthesize with the voice, at the standard per-minute Speak rate.

Can I get telephony-ready audio?

Yes. Speak encodes server-side into mp3, wav, opus, pcm, or 8 kHz G.711 µ-law/A-law, so Twilio and SIP callers get exactly the format the line needs without a client-side resampler or µ-law encoder.

Build with Speak today.

Start free with $50.00 in credit - no card. Your test key works instantly.

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