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Text-to-speech API for AI voice agents

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For voice agents that sound like they belong

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Smart voice assistants

Deliver fast, natural voice interactions inside your product to help answer questions, find information, and complete tasks.

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Support agents

Speak responses clearly and accurately across 60+ languages so customers hear exactly the right information.

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In-app voice agents

Embed natural voice output directly into your app for onboarding, scheduling, self-service, and real-time spoken responses.

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Call routing agents

Speak dynamic prompts and confirmations with accurate data readback, routing callers quickly with clear voice output.

Why Soniox is the best text-to-speech API for voice agents

"Best" for voice agents is not just about natural-sounding speech. It is about predictable, reliable voice output in real production systems.

A text-to-speech system for voice agents should:

  • Stream speech with ultra-low latency, so agents respond the moment the LLM starts generating.
  • Handle interruptions gracefully, stopping and restarting speech without artifacts or delay.
  • Speak structured data accurately, reading phone numbers, codes, and addresses exactly as written.
  • Work across 60+ languages with correct pronunciation for foreign names, entities, and mid-sentence language switching.
  • Scale economically, with pricing that works for high-volume deployments.

Soniox TTS is built around these requirements from the ground up, delivering fast, hallucination-free speech for voice agents across 60+ languages. One unified model supports true multilingual speech without changing configurations or switching models.

And With a competitive pricing, Soniox makes it practical to deploy voice agents at scale in any language.

Ultra-low-latency text-to-speech for real-time agents

speed

Start speaking before the sentence ends

Soniox begins generating audio as soon as tokens arrive. Voice agents respond faster without waiting for the full LLM output to finish.

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Handle interruptions without breaking

When users interrupt, your agent needs to stop and restart speech instantly. Soniox streaming makes it straightforward to cancel and regenerate on the fly.

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Speak structured data exactly right

Phone numbers, emails, order IDs, and verification codes are spoken as written. No hallucinated digits or dropped characters.

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Go multilingual with one model

One API handles 60+ languages. Switch languages mid-conversation without changing models or restarting streams.

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Consistent, high-fidelity voice quality

Every response sounds natural and clear. Soniox delivers consistent voice quality across languages and content types.

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Why it works

Voice agents need TTS that is fast, accurate, multilingual, and production-ready. Soniox combines ultra-low-latency streaming, hallucination-free output, structured data accuracy, and 60+ language support in one real-time API.

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Use Soniox in popular frameworks

Soniox integrates seamlessly with leading real-time communication platforms, AI frameworks, automation tools, and developer SDKs.

An open source framework and developer platform for building, testing, deploying, scaling, and observing agents in production.

Open source framework for voice and multimodal conversational AI.

Twilio is a cloud-based customer engagement platform (CPaaS) that provides APIs, allowing developers to integrate voice, messaging (SMS, WhatsApp), email, and authentication capabilities into applications.

Open-source development framework designed to build applications powered by large language models (LLMs).

The open-source AI toolkit designed to help developers build AI-powered applications and agents with React, Next.js, Vue, Svelte, Node.js, and more.

Open-source AI SDK with a unified interface across multiple providers. No vendor lock-in, no proprietary formats.

n8n is a powerful, low-code/pro-code workflow automation tool that connects various applications, APIs, and databases to automate tasks.

Privacy and compliance, built right in

Never stored, never saved.

Audio stays in memory, everything is processed in real-time.

Built for privacy-critical use cases.

Adhering to leading global security, privacy, and compliance standards.

Trusted where privacy matters most.

Used in industries where speech is sensitive, from healthcare to enterprise.

Soniox is Soc 2 Type 2 compliant
Soniox is ISO 27001:2022 compliant
Soniox is HIPAA compliant
Soniox is GDPR compliant
SOC 2 Type 2 · ISO/IEC 27001:2022 · HIPAA · GDPR

Frequently asked questions about Soniox TTS for voice agents

What is the Soniox Text-to-Speech API?arrow_downward
Soniox provides a real-time text-to-speech API designed for AI voice agents. It converts text into natural-sounding speech with low latency, supports streaming use cases, and works across more than 60 languages.
Is Soniox TTS suitable for building AI voice agents?arrow_downward
Yes. Soniox TTS is designed for real-time voice agent workflows, including streaming audio generation from LLM output, interruption handling, and accurate rendering of structured data like phone numbers and codes.
What makes Soniox a low-latency text-to-speech API?arrow_downward
Soniox uses a streaming architecture that begins generating audio as soon as text tokens arrive. This allows voice agents to start speaking before the full response is generated, reducing end-to-end response time.
How does Soniox TTS handle structured data like phone numbers?arrow_downward
Soniox TTS renders alphanumeric content faithfully. Phone numbers, email addresses, IDs, PINs, and codes are spoken exactly as written, without hallucinated or dropped characters.
Does Soniox TTS support multilingual voice agents?arrow_downward
Yes. Soniox supports speech generation across more than 60 languages using a single model. It handles language switching mid-sentence and pronounces foreign words and names correctly.
Can Soniox TTS handle interruptions in voice agents?arrow_downward
Yes. The streaming API allows you to cancel in-progress speech generation and start a new utterance immediately. This is essential for voice agents that need to handle barge-in and conversational turn-taking.
Is audio stored when using the Soniox TTS API?arrow_downward
No. Audio is generated in real time and not stored by default. Soniox is designed for privacy-critical applications where speech data should not be retained.
How do developers get started with Soniox TTS?arrow_downward
Developers can generate an API key on Soniox Console and start streaming text to the TTS API. The API integrates with common voice agent frameworks, making it easy to add speech output to existing systems.