A real-time STT API that delivers sub-250ms transcription, 100 language support, and multi-engine flexibility for global voice applications.
Voice has become the primary input for modern digital interaction. From AI agents managing customer support to hands-free field applications and global customer experiences, the ability to instantly and accurately convert spoken language into text is non-negotiable.
Transcription accuracy is the foundation. If the transcription is incorrect, it can lead to miscommunication, data entry errors, and even compliance issues in industries that depend on precise records.
However, building for this voice-first world is challenging. Product teams and developers constantly face a forced trade-off: Do you prioritize the fastest ASR engine, the most accurate one, or the one with the best language coverage? Achieving all three often requires integrating multiple vendors, leading to complex and expensive architectures.
Today, that trade-off ends.
We are proud to introduce the Telnyx Real-Time Speech-to-Text (STT) API: a single, developer-friendly integration that delivers sub-250ms transcription, 100+ language support, and the combined intelligence of multiple ASR engines.
Want to see it in action? Check out the Telnyx STT API page or to learn more.
Building a global application that relies on voice means your transcription needs to shift based on the geography, the user's dialect, and the audio quality. Choosing just one vendor means accepting compromises on cost, accuracy, or coverage.
Each engine excels at something different. That’s why multi-engine access is table stakes for building global voice applications that perform at scale.
With Telnyx Real-Time STT, you don’t have to choose. Telnyx offers the best ASR providers via a single API. You are no longer forced to decide between vendors optimized for speed and those optimized for language coverage. You access them all through a single Telnyx STT endpoint. This allows your product teams to instantly switch the underlying ASR engine via a single parameter, ensuring you always have the best balance of cost, accuracy, and language support without ever changing your core code.
This flexibility allows you to optimize your solution for every distinct use case, region, or price point, all from one set of documentation.
For live voice applications, latency dictates user experience. A delay of half a second feels unnatural and can break the flow of a customer service call or frustrate a voice-controlled user.
Telnyx delivers ultra-low latency for smooth, real-time transcription. Our globally distributed, private infrastructure and optimized streaming APIs (via WebSocket) keep performance consistent and fast. For critical applications like AI agents and live captioning, we provide near-instant text back in under 250ms, ensuring seamless, natural interactions every time.
If your app serves a global audience, your STT solution needs to cover that audience effectively. Telnyx is built for the global enterprise, offering support for 100+ languages and regional variants.
This multilingual support is essential for:
For contact centers, healthcare, and financial services, the security and location of transcription data are critical. Telnyx offers enterprise-grade security and flexible data residency. This includes EU hosting for seamless GDPR compliance and ensuring data remains in-region. Our dedicated infrastructure and strong global network connectivity ensure your data is always protected and compliant with industry standards.
Accuracy is often degraded by challenging acoustic environments and complex language. By providing access to specialized engines like Deepgram Nova-3, we ensure high fidelity for your most demanding applications:
The Telnyx STT API is built for the highest-stakes applications that require both performance and precision:
Ready to Add Real-Time STT to Your App?
Voice is rapidly becoming the most natural way to interact with digital products. The Telnyx STT API gives your team a fast, reliable, and developer-friendly way to convert speech into text in real time.
With 100+ language support, sub-250ms latency, flexible ASR engine options, and enterprise-grade security, Telnyx makes it simple to add accurate speech recognition to any workflow or experience.
Sign up for free and get your API key. Check out our transparent pricing and explore dev docs to learn how you can build.
