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URL: https://cartesia.ai/sonic

โ‡ฑ Real-time TTS API with AI laughter and emotion | Cartesia Sonic-3


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

|

Learn more

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

|

Learn more

Sonic-3: the best text-to-speech for voice agents

Meet sonic-3 for Agents

Meet sonic-3 for Agents

Voice AI like youโ€™ve never heard before

Voice AI like youโ€™ve never heard before

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

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

Breakthrough naturalness

So natural, it

1

laughs.

It sounds palpably

2

excited.

Sometimes

devastingly

3

sad.

It

speaks

in

42

languages

โ€”

like

4

Hindi.

And

speaks

5

just

like

you

might.

[laughter]Ohno![laughter]Thisisinsane!Iโ€™mdyingoverhere![laughter]Ijustcan't!

Breakthrough naturalness

So natural, it

1

laughs.

It sounds palpably

2

excited.

Sometimes

devastingly

3

sad.

It

speaks

in

42

languages

โ€”

like

4

Hindi.

And

speaks

5

just

like

you

might.

[laughter]Ohno![laughter]Thisisinsane!Iโ€™mdyingoverhere![laughter]Ijustcan't!

Breakthrough naturalness

So natural, it

1

laughs.

It sounds palpably

2

excited.

Sometimes

devastingly

3

sad.

It

speaks

in

42

languages

โ€”

like

4

Hindi.

And

speaks

5

just

like

you

might.

[laughter]Ohno![laughter]Thisisinsane!Iโ€™mdyingoverhere![laughter]Ijustcan't!

Context-savvy accuracy
for the real-world

[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.

Context-savvy accuracy
for the real-world

[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.

Context-savvy accuracy
for the real-world

[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. Itโ€™s conversational AI thatโ€™s fast, fluidโ€”and virtually human.

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.

Sonic responds faster than you can blink

Human speed

Competitive advantage

At #1, Sonic sets the standard for ultra-low latency. Itโ€™s conversational AI thatโ€™s fast, fluidโ€”and virtually human.

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.

Sonic responds faster than you can blink

At #1, Sonic sets the standard for ultra-low latency. Itโ€™s conversational AI thatโ€™s fast, fluidโ€”and virtually human.

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

Powers every kind of agent across industries

Healthcare

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

Learn more

Healthcare

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

Learn more

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.

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 secondsโ€”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 languagesโ€”including exceptional Hindi.

Americas

Western Europe

Eastern Europe

Asia Pacific

India

Middle East

Americas

Western Europe

Eastern Europe

Asia Pacific

India

Middle East

Americas

Western Europe

Eastern Europe

Asia Pacific

India

Middle East

Portuguese (Brazilian)

Spanish (Latin American)

English (American)

English (Southern American)

French (Canadian)

Developer-first, enterprise-ready

Developer-first, enterprise-ready

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

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

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.

Meet the teams we empower

  • Ravi Krishnamurthy

    VP Product

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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

    โ€œCartesiaโ€™s state-space models bring enterprise-grade speed and quality to our AI Voice Agents.โ€

    Read the full story

  • Bob Summers

    CEO

    โ€œSonic is the only product in existence with model latency of less than 100 ms, outperforming its next best alternative by a factor of four.โ€

    Read the full story

  • Sami Shalabi

    Founder & CTO

    โ€œCartesiaโ€™s Line platform provides us with the essential foundation for building voice agents for modern enterprise environments: speed, reliability, and truly natural voice interactions.โ€

    Read the full story

  • Kwindla Hultman

    CEO

    โ€œCartesia Sonic is the best voice model today for real-time multimodal use cases.โ€

    Read the full story

  • Spencer Chan

    Head of Poe Product

    โ€œWith 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.โ€

    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

    Cartesiaโ€™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