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What Is Cartesia Sonic?
Ultra-fast streaming TTS with 90ms latency and support for 42 languages.
Cartesia Sonic is a high-performance TTS engine built for speed and quality. It delivers consistent approximately 90ms time-to-first-byte across 42 languages with natural-sounding voices. Sonic uses a novel streaming architecture that enables real-time voice generation for conversational AI, gaming, and interactive applications. Supports voice cloning and emotion control.
Official: Cartesia website
ProviderCartesia
TierPremium
SpeedFast
Quality
Supported Languages (40)
en
es
fr
de
it
pt
nl
pl
ru
zh
ja
ko
ar
cs
da
fi
el
hi
hu
id
no
ro
sk
sv
th
tr
uk
vi
bg
ca
hr
et
he
lv
lt
ms
sr
ta
te
ur
Strengths
- ~90ms latency
- 42 languages
- Voice cloning
- Emotion control
- Streaming architecture
Limitations
- Premium tier — requires credits
- Commercial API — higher per-character cost
How to Use Cartesia Sonic via WhatIsTTS
1. Create a free account and get your credits.
2. Go to Text to Speech and select Cartesia Sonic.
3. Enter text, choose a voice, and click Generate. We route to Cartesia.
No API key management needed. We handle authentication, routing, and billing through our unified platform.
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Frequently Asked Questions
Cartesia Sonic is a high-performance TTS engine built for speed and quality. It delivers consistent approximately 90ms time-to-first-byte across 42 languages with natural-sounding voices. Sonic uses a novel streaming architecture that enables real-time voice generation for conversational AI, gaming, and interactive applications. Supports voice cloning and emotion control.
Real-time applications, conversational AI, gaming, interactive experiences
Yes, Cartesia Sonic supports voice cloning from reference audio. Upload a short audio sample and generate new speech in that voice.
Cartesia Sonic supports 40 languages including English. Language availability may vary by voice. Check the voice catalog on our platform for the full list of supported languages and voices.
Visit our Text to Speech page, select Cartesia Sonic from the model dropdown, choose a voice, enter your text, and click Generate. You can also use our REST API: POST to /api/v1/tts/ with model="cartesia-sonic" and your text. No provider API key needed — we handle routing and billing.
Cartesia Sonic is a premium-tier model costing 5 credits per 1,000 characters on WhatIsTTS. Premium models offer the highest quality and advanced features. Credits are included with all plans.
Cartesia Sonic is one of 20+ TTS models available on WhatIsTTS. Compare it with providers like ElevenLabs, OpenAI, Google Cloud, Azure, Amazon Polly, PlayHT, Deepgram, and Cartesia — all accessible through one platform with unified billing. Use our side-by-side comparison to find the best fit.
Yes. Cartesia Sonic is a commercial API from Cartesia that permits commercial use of generated audio. This includes podcasts, videos, apps, IVR systems, and more. Review Cartesia's terms of service for specific requirements.
Through WhatIsTTS, Cartesia Sonic output is available in MP3 (default), WAV, OGG, and FLAC formats. MP3 is ideal for web playback, WAV for further audio processing. Select your preferred format before generating.
Cartesia Sonic has fast generation speed. Optimized for real-time applications like voice chat and interactive experiences.
Yes. WhatIsTTS provides a unified REST API for all providers including Cartesia Sonic. Generate an API key in your account, then POST to /api/v1/tts/ with model="cartesia-sonic". We provide code examples in Python, JavaScript, cURL, and Go. No need to manage a separate Cartesia API key.
Cartesia Sonic by Cartesia offers: ~90ms latency, 42 languages, Voice cloning, Emotion control. Available as a premium-tier model on WhatIsTTS with 40 language support.
No. WhatIsTTS handles the Cartesia integration for you. You only need a WhatIsTTS account and credits. We route your requests to Cartesia's API and handle authentication, billing, and error handling.
Yes, Cartesia Sonic supports streaming output for low-latency applications. Audio chunks are delivered as they are generated, enabling real-time playback.