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INFRO

Cartesia · Audio

Sonic 3 API pricing

cartesia/sonic-3

Low-latency text to speech. Sonic 3 by Cartesia, called through one INFRO key alongside every other model you run. We price it 33% below Cartesia's direct rate — the same model, the same weights, reached through a different integration.

Pricing

Per 1M charsUSD · updated 2026-08-24

Cartesia direct

$55

per 1M chars

INFRO

$37

per 1M chars

You save

33%

on every unit

Illustrative launch rates, reconciled against published provider pricing on 2026-08-24. Live rates come from GET /v1/models once your key is active.

Calling Sonic 3

POST /v1/audio/speechAt launch — Committed to the first release. In build now, not usable yet.
import os
from infro import Infro

client = Infro(api_key=os.environ["INFRO_API_KEY"])

audio = client.audio.speech.create(
    model="cartesia/sonic-3",
    input="Every AI model, one API.",
)

What this modality supports

  • Text to speech
  • Music generation
  • Transcription
  • Diarization

Text-to-speech with streaming playback, full-track music generation, and transcription with timestamps and diarization. Billed per character generated, per track, and per hour transcribed.

QuickstartGet a key

Alternatives for low-latency text to speech

Same modality, nearest in price. All of them share the request shape above, so comparing them is a one-word change.

Work out what Sonic 3 would cost you

Put your current spend on this model into the calculator and see the same workload priced here — or have us read your real usage.

Calculate your savingsFree cost audit