AI audio
AssemblyAI
Industry-leading Speech AI models for high-accuracy transcription, real-time und
What is AssemblyAI?
AssemblyAI provides industry-leading Speech AI models that enable developers to transcribe speech to text and extract actionable insights from voice data.The platform combines models, APIs, and infrastructure into one place, allowing teams to build voice capabilities into any product on any stack, processing over 2 billion API calls a month for top companies like Zoom.
Key offerings include Universal-3.6 Pro, the most accurate pre-recorded speech-to-text model supporting 32 languages with native code-switching; a real-time speech-to-text model optimized for voice agents that accurately handles interruptions and short answers; and the newly released AssemblyAI-TTS-1, a text-to-speech model built specifically for voice agents on live calls to ensure natural sound and fast response times.
Beyond transcription and synthesis, AssemblyAI offers Speech Understanding APIs, Guardrails and Safety features, and an LLM Gateway.It supports diverse use cases such as medical transcription, call analytics, and AI notetakers.The platform ranks first in independent benchmarks for critical metrics like Name, Address, and Number Error Rate (NEER) and Diarization Error Rate (DER).
Key features
- High-Accuracy PrUniversal-3.6 Pro delivers industry-leading accuracy for recorded audio, supporting native code-switching across 32 languages and precise speaker labeling.
- Real-Time OptimiA real-time speech-to-text model built for voice agents that hears the caller not the room, catching short answers, interruptions, and language switches instantly.
- Natural Text-to-AssemblyAI-TTS-1 is trained on millions of real phone calls to provide natural-sounding, fast-response speech synthesis specifically designed for voice agents on live calls.
- Speech UnderstanIncludes Speech Understanding APIs, Guardrails and Safety features, and an LLM Gateway to ensure secure and context-aware interactions.
- Extensive LanguaSupports 99 languages including English, Spanish, French, German, and Japanese, enabling global deployment of voice AI solutions.
- Enterprise-GradeOffers Self-Hosted Voice AI Cloud and production-ready inference infrastructure that scales to handle billions of API calls per month.
How to use it
- Sign up for an AssemblyAI account and obtain your API key.
- Review the documentation to select the appropriate model for your use case, such as pre-recorded transcription or real-time voice agents.
- Send audio data or text requests using the provided SDKs or directly via the REST API.
- Test different models and adjust parameters like speaker diarization or key terms using the interactive Playground.
- Integrate the API into your application, leveraging guardrails and safety features to ensure compliance.
- Monitor API usage and scale to enterprise-grade infrastructure as needed.
Where it fits
- Intelligent VoicBuild customer service bots that converse fluently, handle interruptions, and keep users engaged using low-latency real-time transcription and natural TTS models.
- Meeting & Call AAutomatically transcribe meeting recordings or customer calls to extract key insights, generate summaries, and perform sentiment or compliance analysis.
- Medical TranscriProvide high-accuracy transcription for medical visits, supporting specialized terminology and multiple languages to reduce administrative burden for healthcare providers.
- AI NotetakersConvert voice notes into structured text records automatically with multi-speaker identification, boosting productivity for individuals and teams.
Pricing and free quota
Pricing and any free quota follow the official site.
Who it is for
- Voice AI Developers
- Customer Service Tech Providers
- Healthcare Organizations
- Enterprise Data Analytics Teams
FAQ
Which languages does AssemblyAI support?
The platform supports 99 languages, including English, Spanish, Portuguese, French, German, Russian, Hindi, Dutch, Japanese, and Italian.
What is AssemblyAI-TTS-1?
It is AssemblyAI's first text-to-speech model, built specifically for voice agents on live calls, offering natural sound and fast response times.
How does it handle interruptions in real-time calls?
The real-time speech-to-text model is optimized for voice agents to accurately catch short answers and interruptions while maintaining accuracy during language switches.
Is there a free trial or demo available?
You can test the models using the AssemblyAI Playground by uploading audio files or providing URLs to experience the transcription capabilities.