Ultravox.ai

Ultravox.ai is the enterprise-grade Voice AI platform engineered specifically to handle massive scale while delivering truly human-like conversations. By eliminating the latency and fragility inherent in traditional component-based voice systems, Ultravox solves the core problem of awkward, slow AI interactions. It is the definitive solution for innovators and enterprises requiring reliable, high-speed, and cost-effective conversational agents.

Key Features

Ultravox is built on an open-weight Speech Language Model (SLM) that understands speech naturally and directly, enabling superior performance and context awareness.

• 🎙️ Direct Speech Processing (No ASR Lag): Unlike legacy systems that rely on slow, cascaded pipelines (Speech-to-Text, then LLM), Ultravox processes speech directly. This reduced stack minimizes friction and latency, ensuring conversations flow smoothly without the awkward pauses or lost reasoning that degrade user experience.
• 🌐 Unlimited Scalability and Reliability: Since we control the entire voice stack, Ultravox guarantees system availability and reliability. Paid plans offer unlimited concurrency, allowing enterprises to scale rapidly and handle massive traffic spikes (inbound or outbound) without hitting hard caps.
• 🛠️ Real-World Tool Integration (Function Calling): Empower your agents to connect to the world. Tools allow agents to invoke custom or built-in functions—such as accessing databases, retrieving live inventory, or making API calls—making them capable of executing complex, real-world tasks instantly.
• 🧠 Contextual Knowledge Retrieval (RAG): Upload proprietary documents and data corpora to instantly equip your agents with custom, contextual knowledge. This Retrieval-Augmented Generation (RAG) ensures agents provide accurate, domain-specific answers relevant to your business needs.
• 🌎 Extensive Multi-Lingual Support: Reach global audiences immediately with support for 26 spoken languages (including English, Spanish, Chinese, French, German, Japanese, and more). This capability ensures your voice agents can operate effectively across diverse markets.

Use Cases

Ultravox provides the foundation for building sophisticated voice applications that drive tangible business outcomes.

High-Volume Customer Service Automation

Deploy Ultravox agents to handle peak call volumes for customer support. Because the platform offers guaranteed reliability and no hard concurrency caps on scaling plans, you can automate thousands of concurrent interactions during high-demand periods (like product launches or seasonal spikes) while maintaining low latency and high conversational quality.

Dynamic Sales and Lead Qualification

Integrate custom tools and RAG knowledge to create intelligent outbound sales agents. These agents can access CRM data, qualify leads based on real-time criteria, book appointments, and provide accurate product information in 26 languages, ensuring natural, effective interactions that maximize conversion rates.

Flexible Telephony Integration

Utilize the Bring Your Own Telephony (BYOT) design to seamlessly integrate Ultravox with your existing infrastructure, whether you use SIP trunking, Twilio, or other telephony providers. Developers can connect agents via REST API, SDKs, or WebSockets, enabling rapid deployment into web apps, native mobile apps, or traditional phone systems.

Ultravox is engineered to surpass the limitations of legacy voice systems, delivering superior performance, intelligence, and accessibility.

Performance Through Architecture

The core differentiator is the No ASR Pipeline. By removing the traditional cascaded pipeline of services—which are inherently slower, more brittle, and often lose conversational nuance—Ultravox achieves much faster and more consistent response times. This direct speech understanding capability is the key to achieving fluid, human-like dialogue.

Verified Intelligence and Accuracy

Ultravox demonstrates superior instruction-following capabilities compared to leading market models. In zero-shot speech translation benchmarks (CoVoST2, measured by BLEU), Ultravox 0.5 70B achieved a score of 35.7, surpassing both GPT-4o Realtime (34.6) and Gemini 1.5 Flash 002 (33.0). This measurable performance ensures your agents are smarter and more accurate.

Enterprise Performance, Accessible Pricing

Ultravox delivers enterprise-grade performance at an unbeatable price point of just $0.05 per minute after the initial free trial period. This straightforward, low-cost structure, combined with the ability to eliminate concurrency caps, makes premium voice AI accessible for both fast-moving startups and Fortune 500 companies.

Conclusion

Ultravox sets a new standard for speed, intelligence, and reliability in voice AI. By focusing on direct speech understanding, massive scalability, and complete integration flexibility, we provide the platform necessary to build the next generation of conversational applications.

Explore the console for rapid prototyping or leverage the API-first platform to integrate low-latency voice agents into your production environment.