Meet Sonic-3: the best text-to-speech for voice agents\
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Meet sonic-3 for Agents

VoiceAIlikeyou’veneverheardbefore

The only streaming text-to-speech that laughs, emotes, and pulls you into the conversation.

Try for free

Contact Sales

<emotion value="excited" />Oh wow, Valentine's Day snuck up on you, huh? [laughter] Don't worry—we'll get you a table, no problem! Let's make it special.

<emotion value="excited" />Oh wow, Valentine's Day snuck up on you, huh? [laughter] Don't worry—we'll get you a table, no problem! Let's make it special.

ConciergeCustomer SupportCompanionGamingLogistics

English

Play

Breakthrough naturalness

So natural, it

1

laughs.

It sounds palpably

2

excited.

Sometimes

devastingly

3

sad.

It

speaks

in

42

languages

—

like

4

Hindi.

And

speaks

5

just

like

you

might.

[laughter]Ohno![laughter]Thisisinsane!I’mdyingoverhere![laughter]Ijustcan't!

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Context-savvy accuracy for the real-world

Try for free

[01]

CallupNASA,theFBI,andtheNSA.Then,um,tryUNESCO.

Acronyms & Initialisms

Handles acronyms and initialisms intelligently, reading them as words or spelling them out, depending on convention.

Sonic responds faster than you can blink

Human speed

Competitive advantage

At #1, Sonic sets the standard for ultra-low latency. It’s conversational AI that’s fast, fluid—and virtually human.

Try for free

Sonic

Blink of an eye

Human conversational response threshold

Real-time responses

Speed designed for real-time interactions means conversations feel seamless, not laggy.

Proven at scale, worldwide

From San Francisco to Tokyo, Sonic leads in latency at P50 to P99 consistently and reliably.

Performance budget

Low-latency from our text-to-speech creates affordances across the rest of your stack.

Powering agents across industries and personas

Build with Sonic-3

Healthcare

Simplify scheduling, clarify benefits, and enhance patient experiences with friendly, trustworthy voices.

Learn more

Curated voices for conversation

From sidekicks to experts, our voice library spans every persona, helping you build expressive and engaging agents.

Instant & Professional Voice Cloning

Instantly create custom clones in 10 seconds—or generate Pro Voice Clones, fine-tuned and tailored to your business.

Fluent and native, worldwide

Reach international markets with Sonic. It speaks 40+ languages covering 95% of the world, all with native voices. It even speaks 9 Indian languages—including exceptional Hindi.

Explore 40+ Languages

Americas

Western Europe

Eastern Europe

Asia Pacific

India

Middle East

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Dutch

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English (British)

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French

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German

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Italian

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Portuguese (European)

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Spanish (European)

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Swedish

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Greek

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Finnish

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Danish

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Norwegian

Developer-first, enterprise-ready

Sonic is built for rapid prototyping and seamless integration. Developers trust it for secure, compliant, production-ready performance.

Build with Sonic-3

API

Integrate Sonic directly into your product with simple, well-documented endpoints.

SDK

Speed up development with pre-built SDKs in your favorite languages.

Playground

Experiment with real voice interactions instantly in your browser. Test scripts, customize your voices, and hear the results in real time.

Enterprise Grade

SOC 2 Type II

HIPAA

PCI Level 1

Reliable uptime

Meet the teams we empower

Discover success stories

• \
  \
  \
  \
  Ravi Krishnamurthy\
  \
  VP Product\
  \
  “Cartesia’s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.”\
  \
  Read the full story

• \
  \
  \
  \
  Bob Summers\
  \
  CEO\
  \
  “Sonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.” \
  \
  Read the full story

• \
  \
  \
  \
  Sami Shalabi\
  \
  Founder & CTO\
  \
  “Cartesia’s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.” \
  \
  Read the full story

• \
  \
  \
  \
  Kwindla Hultman\
  \
  CEO\
  \
  “Cartesia Sonic is the best voice model today for real-time multimodal use cases.” \
  \
  Read the full story

• \
  \
  \
  \
  Spencer Chan\
  \
  Head of Poe Product\
  \
  “With Cartesia's Sonic model, users can interact with a wide range of high-quality, human-like voices in multiple languages, enhancing their experience on our platform.” \
  \
  Read the full story

• \
  \
  \
  \
  Vipul Ved Prakash\
  \
  CEO\
  \
  Cartesia is leading the charge of building efficient, multimodal models from first principles, starting with their Sonic TTS model. \
  \
  Read the full story

• \
  \
  \
  \
  Hassaan Raza\
  \
  CEO\
  \
  Cartesia’s Sonic model is a game-changer [...] Its ultra-low latency of 90ms and high-quality voice generation have enabled us to create truly immersive real-time conversations.\
  \
  Read the full story

• \
  \
  \
  \
  Ravi Krishnamurthy\
  \
  VP Product\
  \
  “Cartesia’s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.”\
  \
  Read the full story

• \
  \
  \
  \
  Bob Summers\
  \
  CEO\
  \
  “Sonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.” \
  \
  Read the full story

• \
  \
  \
  \
  Sami Shalabi\
  \
  Founder & CTO\
  \
  “Cartesia’s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.” \
  \
  Read the full story

• \
  \
  \
  \
  Kwindla Hultman\
  \
  CEO\
  \
  “Cartesia Sonic is the best voice model today for real-time multimodal use cases.” \
  \
  Read the full story

• \
  \
  \
  \
  Spencer Chan\
  \
  Head of Poe Product\
  \
  “With Cartesia's Sonic model, users can interact with a wide range of high-quality, human-like voices in multiple languages, enhancing their experience on our platform.” \
  \
  Read the full story

• \
  \
  \
  \
  Vipul Ved Prakash\
  \
  CEO\
  \
  Cartesia is leading the charge of building efficient, multimodal models from first principles, starting with their Sonic TTS model. \
  \
  Read the full story

• \
  \
  \
  \
  Hassaan Raza\
  \
  CEO\
  \
  Cartesia’s Sonic model is a game-changer [...] Its ultra-low latency of 90ms and high-quality voice generation have enabled us to create truly immersive real-time conversations.\
  \
  Read the full story

• \
  \
  \
  \
  Ravi Krishnamurthy\
  \
  VP Product\
  \
  “Cartesia’s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.”\
  \
  Read the full story

• \
  \
  \
  \
  Bob Summers\
  \
  CEO\
  \
  “Sonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.” \
  \
  Read the full story

• \
  \
  \
  \
  Sami Shalabi\
  \
  Founder & CTO\
  \
  “Cartesia’s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.” \
  \
  Read the full story

• \
  \
  \
  \
  Kwindla Hultman\
  \
  CEO\
  \
  “Cartesia Sonic is the best voice model today for real-time multimodal use cases.” \
  \
  Read the full story

• \
  \
  \
  \
  Spencer Chan\
  \
  Head of Poe Product\
  \
  “With Cartesia's Sonic model, users can interact with a wide range of high-quality, human-like voices in multiple languages, enhancing their experience on our platform.” \
  \
  Read the full story

• \
  \
  \
  \
  Vipul Ved Prakash\
  \
  CEO\
  \
  Cartesia is leading the charge of building efficient, multimodal models from first principles, starting with their Sonic TTS model. \
  \
  Read the full story

• \
  \
  \
  \
  Hassaan Raza\
  \
  CEO\
  \
  Cartesia’s Sonic model is a game-changer [...] Its ultra-low latency of 90ms and high-quality voice generation have enabled us to create truly immersive real-time conversations.\
  \
  Read the full story

• \
  \
  \
  \
  Ravi Krishnamurthy\
  \
  VP Product\
  \
  “Cartesia’s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.”\
  \
  Read the full story

• \
  \
  \
  \
  Bob Summers\
  \
  CEO\
  \
  “Sonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.” \
  \
  Read the full story

• \
  \
  \
  \
  Sami Shalabi\
  \
  Founder & CTO\
  \
  “Cartesia’s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.” \
  \
  Read the full story

• \
  \
  \
  \
  Kwindla Hultman\
  \
  CEO\
  \
  “Cartesia Sonic is the best voice model today for real-time multimodal use cases.” \
  \
  Read the full story

• \
  \
  \
  \
  Spencer Chan\
  \
  Head of Poe Product\
  \
  “With Cartesia's Sonic model, users can interact with a wide range of high-quality, human-like voices in multiple languages, enhancing their experience on our platform.” \
  \
  Read the full story

• \
  \
  \
  \
  Vipul Ved Prakash\
  \
  CEO\
  \
  Cartesia is leading the charge of building efficient, multimodal models from first principles, starting with their Sonic TTS model. \
  \
  Read the full story

• \
  \
  \
  \
  Hassaan Raza\
  \
  CEO\
  \
  Cartesia’s Sonic model is a game-changer [...] Its ultra-low latency of 90ms and high-quality voice generation have enabled us to create truly immersive real-time conversations.\
  \
  Read the full story

Real-time, multimodal intelligence for every device.

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