Streaming Speech-to-Text
Power real-time voice experiences with ultra-fast and ultra-accurate speech-to-text, unlimited concurrency, and pricing that scales with you.
Universal-Streaming
Ultra-fast, ultra-accurate streaming speech-to-text
Intelligent turn detection
Create voice experiences that feel more intuitive and responsive while mainitaining the flexibility to optimize for your unique requirements.
See it in action
Hello! Try our newest Universal-Streaming speech-to-text model. Experience how fast and accurate it is in our Playground.
Ultra-fast transcription understands users as they speak
300 ms (P50) latency on immutable finals gives downstream services a head-start without mid-stream revisions.
Delivers reliable, unchanging transcripts from the beginning.- Adjustable speed↔post‑processing dial to fit every use case.
- Almost 2x faster on P99 latencies compared to Deepgram Nova-3.
Intelligent endpointing for smoother turn detection
Conversations flow naturally—your agent replies with precise timing, reducing awkward pauses and itteruptions.
- Maintain full control with configurable silence thresholds and confidence parameters to fine-tune the experience for your specific use case.
- Decreases end‑of‑turn delay versus traditional silence detection.
- Handle natural pauses without premature interruptions.
Superior accuracy where it matters
Accuratly capture names, numbers, and business terms—so LLM logic stays on track.
- 12% overall recognition improvements, ensuring superior accuracy across the board.
- 21% fewer alphanumeric errors on email addresses, confirmation codes, phone numbers, and ID numbers.
- 5% improvement in proper noun recognition for names of people, products, and businesses.
Pricing starts at $0.15/hr with unlimited streams
Premium performance comes at a fraction of the cost without capacity planning or surprise fees.
- Transparent pricing starting at just $0.15/hr — charging for total session duration, not audio duration or pre-purchased capacity.
- Unlimited concurrent streams with no hard caps or over-stream surcharges.
- Consistent performance from 5 to 50,000+ streams without performance degradation or usage commitments.
Designed for voice experiences that feel more intuitive and responsive
Intelligent Endpointing
Combines acoustic and semantic features with traditional silence detection for faster, more accurate end-of-turn detection.
Automatic Concurrency Scaling
Handle thousands of concurrent connections without manual intervention, eliminating the need for complex connection management.
Developer Toggles
Fine-tune the balance between speed and accuracy with configurable API options for timestamps, formatting, and punctuation.
Enhanced Visibility
Monitor streaming performance metrics in real-time with comprehensive analytics and usage insights.
Auto Punctuation and Casing
Automatically add casing and punctuation of proper nouns to the transcription text.
Fewer correction loops and smoother conversations
Model | Overall | Alphanumerics | Proper Nouns |
|---|---|---|---|
AssemblyAI Universal-Streaming | 91.1% | 94.6% | 91.8% |
Deepgram Nova-3 | 89.9% | 93.3% | 91.4% |
Ready to plug into your voice‑agent stack
Pre-built integrations with step‑by‑step docs enabling quick implementation without disrupting existing workflows.
The speed difference is immediately noticeable - our users see their conversations transcribed almost instantaneously. It feels so much more responsive than what we were using before.
Turn voice data into unparalleled product experiences
Partner with the leader in Speech AI to build powerful products with breakthrough industry impact.
