Speech-to-Text

The industry's best products need the industry's best models. Build on speech-to-text models that lead the way in accuracy and quality, accessible through a simple API.

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Speech-to-text quality that speaks for itself.

Our Universal model sets the standard for accuracy and performance on the details that define speech-to-text quality.

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Universal-2

Saudi Arabia, Fiji, Tonga, Hong Kong and Bahrain. All these countries are using Austrian medical coding. For example, if you want to go to New Zealand, if you know Austrian 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 ICD10CM and CPT and as well as Austrian medical coding. So now we can see how can I search job in Australia.

Deepgram

Saudi the Arabia, FijiPh, Tonga, Hong Kong and Bahrain. All these countries are using AustrianMedical medical coding. For example, if you want to go to New Zealand,zealand. ifIf you know AustrianMedical medical coding, you can go New Zealandzealand easily. asA a medical codercode or clinical codercode. So for example, if you want to go Singapore, but in Singapore, they will use both, ICD10CMIct 10 Centimeters and CPTCpt, and as well as Austrianare still medical coding. So now we can see how can I searchsay jobJob in Australia.?

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Universal

The flyovers by US Warplanes off North Korea's east coast over the weekend were an agreed move between South Korea and the United States. Two B1B Lancer bombers from Anderson Air Force Base in Guam and six F15C air superiority fighter jets from Okinawa's Kadena airbase flew in international airspace off North Korea's east coast for approximately three hours from Saturday night until early Sunday morning

Deepgram

The flyoversfly overs by USUs Warplaneswarp planes off North Korea's east coast over the weekend were an a agreed move between South Korea and the United States. Two2B1 B1Blancer Lancer bombers from AndersonAndersen Air Forceforce Basebase inand Guam, and six6 F15Cf 15 sea air superiority fighter jets from Okinawa's KadenaCad airbasebase, flew in international airspace off North Korea's eastEast coastCoast for approximately three3 hours from Saturday night until early Sunday morning.

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Universal-2

Deepgram

Powering the world’s most trusted Voice AI products

Your product experience is only as good as the foundation that powers it. Make sure you build on the best.

The accuracy and quality that Voice AI apps require

Our speech-to-text models redefine what quality means for Voice AI by delivering transcripts that are consistently trustworthy, and built for real-world performance.

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
1,000-word context-aware key term prompting for domain expertise compared to other leading speech-to-text models

Don't just transcribe speech, understand it

Analyze dialog flow and speaker relationships to capture who is speaking, what they mean, and why it matters.

Track dialogue and speaker context across turns for natural comprehension
Resolve ambiguity automatically — distinguishing between similar terms and acronyms
Capture tone, corrections, and implied meaning to preserve intent
Ensure reliable performance in overlapping, multi-speaker, and noisy environments

Reliable performance across the globe

We speak your customers' language, so you can serve a global customer base.

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
Handle medical, legal, and technical terms easily with specialized vocab

A single platform for all things Voice AI

Innovate, ship, and scale faster than ever, all on a developer-first API.

Unified speech-to-intelligence pipeline through LLM Gateway
Seamlessly integrate with leading LLMs, including OpenAI, Anthropic, and Google
Reliable, enterprise-grade infrastructure with zero rate limits
No contract, usage-based pricing that's built to scale with you

Capturing speech is where it starts. Creating outcomes is where it counts.

Learn why today’s most innovative companies choose us.

15% improvement

Jiminny scored 15% higher customer win rates after implementing AssemblyAI.

Assembly 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.

Krish Ramineni, CEO and co-founder

International Language Support

Gain support to transcribe over 99+ languages and counting, including Global English (English and all of its accents).

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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.

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Automatic Language Detection

Identify the dominant language spoken in an audio file and use it during the transcription.

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Word Timings

Receive a response that also includes an array with information about each word, and the start and end timings.

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Auto Punctuation and Casing

Automatically add casing and punctuation of proper nouns to the transcription text.

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Fewer correction loops and smoother conversations

Accuracy is more than just the right words—it’s trust in your data. Universal lets users spend less time filling in the gaps and more time putting insight into action.