Speech-to-Text
Universal-3 Pro delivers the accuracy voice applications demand — precise on names, alphanumerics, and technical vocabulary — through a simple, developer-first API.
Welcome to another edition of Traveler TV. Today we're at the Arthur Ravenel Jr. Bridge, located here. It opened in 2005 and is currently the longest cable-stayed bridge in the Western Hemisphere. The design features two diamond-shaped towers that span the Cooper River and connect downtown Charleston with Mount Pleasant. The bicycle or pedestrian paths provide unparalleled views of the harbor and is the perfect spot to catch a sunrise or sunset. To walk or bike the bridge, you can park on either the downtown side here or on the Mount Pleasant side in Memorial Waterfront Park. To learn more about the Arthur Ravenel Jr. Bridge and other fun things to do in Charleston, South Carolina. Visit our website at travelerofcharleston.com or download our free mobile app, Exploring Charleston SC.
Welcome to another edition of Traveler TVTv. Today, we're at the Arthur RavenelRa Jr.Junior Bridge, located here. It opened in 2005 and is currently the longest cable stayedstay bridge in the Western Hemisphere. The design features two2 diamond shaped diamond shaped towers that span the Cooper River and connect downtown Charleston with Mount Pleasant. The bicycle or pedestrian paths provide unparalleled views of the harbor and is the perfect spot to catch a sunrise or sunset. To walk or bike the bridge, you can park on either the downtown side here or on themount Mountpleasant Pleasant side in Memorial Waterfrontwaterfront Parkpark. To learn more about the Arthur RavenelRaven Jr.Junior Bridge and other fun things to do in Charleston, South Carolina., Visitvisit our website at travelerofcharleston.traveler of charleston dot com or download our free mobile app, exploring Charlestoncharleston SCs. The
Saudi Arabia, Fiji, Tonga, Hong Kong and Bahrain. All these countries are using Australian medical coding. For example, if you want to go to New Zealand, if you know Australian medical coding, you can go New Zealand easily as a medical coder or clinical coder. So for example, if you want to go Singapore, but in Singapore they will use both ICD-10-CM and CPT and as well as Australian medical coding. So now we can see how can I search job in Australia.
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The flyovers by U.S. warplanes off North Korea's east coast over the weekend were an agreed move between South Korea and the United States. Two B-1B Lancer bombers from Andersen Air Force Base in Guam and six F-15C air superiority fighter jets from Okinawa's Kadena Air Base flew in international airspace off North Korea's east coast for approximately 3 hours from Saturday night until early Sunday morning.
The flyoversfly overs by U.S.Us warplaneswarp planes off North Korea's east coast over the weekend were an a agreed move between South Korea and the United States. Two2B1 B-1Blancer Lancer bombers from Andersen Air Forceforce Basebase inand Guam, and six6 F-15Cf 15 sea air superiority fighter jets from Okinawa's KadenaCad Air Basebase, flew in international airspace off North Korea's eastEast coastCoast for approximately 3 hours from Saturday night until early Sunday morning.
The speech-to-text layer behind today's fastest-moving Voice AI companies
Accuracy at the foundation changes everything. That’s why the fastest-moving voice teams build on AssemblyAI.
Where Voice AI accuracy is won or lost
The words that matter most — names, alphanumerics, technical terms — are the ones most models get wrong. Universal-3 Pro is built around getting them right.
Capture meaning, not just sound with contextual prompting across every conversation- 57% better recognition of key terms like names, codes, and medical terms
- 64% reduction in speaker counting errors compared to competitors
- 1500+ word context-aware prompting for domain expertise compared to other leading speech-to-text models
Don't just transcribe speech, understand it
A transcript tells you what was said. AssemblyAI tells you what it meant.
- Track dialogue and speaker context across turns for natural comprehension, labeling speakers by name or role
- Resolve ambiguity automatically — distinguishing between similar terms and acronyms
- Capture non-speech audio events, tone, corrections, and implied meaning to preserve intent
- Ensure reliable performance in overlapping, multi-speaker, and noisy environments
Global reach without accuracy trade-offs
Serve customers in any language or dialect, with accuracy that doesn’t degrade at the edges.
- 99-language support with automatic detection and code-switching between English and other languages
- Adapt to regional accents, dialects, and cultural expressions
- Language aware formatting for global date, number, and punctuation standards
- Medical Mode: clinical-grade accuracy on medications, procedures, and dosages — no separate model or specialized infrastructure needed.
From transcription to intelligence in a single pipeline
Transcription, LLM routing, guardrails — one API key, one bill, zero vendor management.
- Route any transcript to any LLM through the same API key you already use for transcription
- Seamlessly integrate with leading LLMs, including Claude, Gemini, GPT and more
- Unlimited concurrency — scale to any volume without rate limits, caps, or surprise charges.
- Pay as you go, no contracts, cancel anytime.
Capturing speech is where it starts. Creating outcomes is where it counts.
Real results from teams who build on AssemblyAI.
Reduction in customer complaints and support tickets
Conversion rate for their Conversational Intelligence product
Jiminny scored 15% higher customer win rates after implementing AssemblyAI.
AssemblyAI is instrumental in our transcription process, providing crucial input for our LLM API to process further. It's become an integral part of our workflow.
Universal-3 Pro is optimized for real world conversations
Tested on diverse data sets, Universal-3 Pro delivers low missed entity rates on real world audio.
Missed entity rate by entity type (Lower is better) | AssemblyAI Universal-3 Pro | ElevenLabs Scribe V2 | OpenAI GPT-4o-Transcribe | Speechmatics Enhanced | Microsoft Batch Transcription | Amazon Transcribe | Deepgram Nova-3 |
|---|---|---|---|---|---|---|---|
Date and time | 7.50% | 11.941% | 12.29% | 17.33% | 10.48% | 20.76% | 18.69% |
Locations | 8.26% | 13.58% | 12.15% | 19.03% | 15.91% | 10.49% | 13.94% |
Medical Terms | 13.61% | 11.39% | 16.50% | 23.87% | 24.93% | 13.94% | 16.95% |
Designed for voice experiences that feel more intuitive and responsive
International Language Support
Gain support to transcribe over 99+ languages and counting, including Global English (English and all of its accents).
Speaker Diarization
Detect multiple speakers in an audio file and what each speaker said. Receive a list of utterances, where each utterance corresponds to an uninterrupted segment of speech from a single speaker.
Automatic Language Detection
Identify the dominant language spoken in an audio file and use it during the transcription.
Word Timings
Receive a response that also includes an array with information about each word, and the start and end timings.
Auto Punctuation and Casing
Automatically add casing and punctuation of proper nouns to the transcription text.
Frequently Asked Questions
A speech-to-text API is a developer interface that turns audio into text. Your app sends an audio file or live stream to an endpoint and receives a transcript, often with word timestamps, speaker labels, and confidence scores. Many providers support both batch and real-time transcription for integrating captions, notes, or analytics into products.
AssemblyAI’s Universal model leads our published benchmarks with a 93.3% Word Accuracy Rate and delivers near‑human accuracy, even on noisy or challenging audio.
Yes. For pre-recorded audio, AssemblyAI detects and transcribes code-switching, with best results for English+Spanish or English+German. Configure via language_codes (max two; one must be “en”) or enable language_detection with code_switching and an optional confidence threshold.
Yes. AssemblyAI offers real-time Streaming Speech-to-Text via a secure WebSocket API, returning partial and final transcripts within a few hundred milliseconds. It’s optimized for ultra-low latency (~300 ms P50) and supports use cases like live captioning and voice agents.
Sign up and get your API key in the Dashboard. Install an SDK (e.g., JavaScript). Initialize the client with your key, then call transcribe with your audio. For streaming/voice agents, set ASSEMBLYAI_API_KEY in your environment. Create keys in the Dashboard’s API Keys section.
Pay‑as‑you‑go: $0.15/hr for Universal (pre‑recorded and streaming); $0.27/hr for Slam‑1 (pre‑recorded). Billed per second. Optional Speech Understanding features are priced separately (e.g., Speaker Identification $0.02/hr).
Yes. AssemblyAI integrates with LLMs via LLM Gateway—a single API to OpenAI (GPT), Anthropic (Claude), Google (Gemini), and more. You can route transcripts directly to these models, switch providers without code changes, and use chat completions, multi-turn, tool calling, and agentic workflows, with unified management and billing.
Unlock the value of voice data
Build what’s next on the platform powering thousands of the industry’s leading of Voice AI apps.
