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Introducing Universal-1: Our most powerful SpeechAI model to date.Learn more

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Transform speech into meaning

Build with the leader in Speech AI to power world-class products with unmatched accuracy, breakthrough speech-to-text models, and profound speech understanding.

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Build expertly, effortlessly

Redefine what’s possible with voice data—all on one seamless API that evolves ahead of the industry and handles the heavy lifting.

Speech-to-Text Transcription

Elevate voice outputs with accurate transcriptions and advanced features like speaker diarization and language detection.

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Streaming Speech-to-Text

Generate real-time captions, transcripts, and more with high-accuracy, low-latency voice recognition technology.

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Speech Understanding

Extract valuable insights you can act on with sophisticated audio-intelligence models and the most advanced LLM capabilities.

Learn more
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import assemblyai as aai

transcriber = aai.Transcriber()
transcript = transcriber.transcribe(URL, config)

print(transcript)
{
  "id": "6rlr37h8f4-e310-4e23-bbf3-ea5f347dc684",
  "language_code": "en_us",
  "status": "completed",
  "text": "Runner's knee is a condition characterized by pain behind or around the kneecap...",
  "confidence": 0.98122,
  "audio_duration": 3200,
  "words": [
    { "text": "Runner's", "start": 0, "end": 550, "speaker": "A", "confidence": 0.98113 },
    { "text": "knee", "start": 580, "end": 1130, "speaker": "A", "confidence": 0.95417 }
  ]
}

Industry-leading Speech AI, on a developer-first API

The AI is the limit. Make sure you build on the best.

Best in class

We lead with accuracy

Our speech-to-text models are the most accurate on the market with top performance rankings across major industry benchmarks.
The highest accuracy rates—up to 95%
Up to 30% less hallucinations than other leaders
Low latency—63 minutes converts in 35 seconds
Explore benchmarks
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Capabilities

Built beyond transcription

Groundbreaking audio intelligence lets you dream bigger, build better, and transform words into meaningful ideas, insights, and opportunities.
Fully-featured Speech Understanding models
Built by top research leaders, scientists, and engineers
Rapid innovations that help you outpace the industry
Check out our products
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Build-ready

Trusted by developers

From intuitive API experiences to detailed technical tutorials, developers choose AssemblyAI because we build with them in mind.
SDKs that perform, improve, and scale—reliably
Clear and comprehensive developer documentation
Implement with just 5 lines of code—update with zero
Go to developer docs
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We’re not playing around—but you can

Put our AI models to the test in our no-code playground.

Screenshot of the AssemblyAI Playground. It shows a transcription panel with a text about language models, mentioning their probabilistic nature, training methods, and the challenges of quality data.Mobile screenshot of the AssemblyAI Playground. It shows a transcription panel with a text about language models, mentioning their probabilistic nature, training methods, and the challenges of quality data.Explore Playground

A foundation you can build on

Future-proof your products with superior standards that scale with you.

Research first
Our Speech AI experts are solving top industry challenges and pioneering new possibilities for world-class voice data products.
Our research
Always advancing
We keep you on the cutting edge with weekly features and updates that ship out ready for production without requiring more work from your team.
Changelog
Priced to scale
Cost won’t prevent you from building winning products. We keep pricing scalable with payment options and custom volume discounts.
Pricing
Security focused
We keep your data private, safe, and secure with our security-first practices and comprehensive enterprise-grade protections.
Security
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200,000+ customers build with AssemblyAI

Learn why they choose us.

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Ryan Johnson

Chief Product Officer at CallRail

"Partnering with AssemblyAI has made it easy for us to deliver world-class voice intelligence powered by market-leading speech-to-text technology."

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Vedant Maheshwari

CEO at Vidyo

"We have had a phenomenal experience so far. The integration was simple and easy for developers to get started. The accuracy is better than any other tools in the market (and we have tried them all). Highly recommend!"

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Tom Lavery

Founder & CEO at Jiminny

"AssemblyAI has a real high-touch personal service. It’s a great partnership—we’re very collaborative and get to test new AI models early. AssemblyAI is really pushing boundaries, helping us create a well-rounded Conversation Intelligence platform."

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Alexander Kvamme

Co-founder & CEO at EchoAI

"Works incredibly well out of the box. Allowed us to focus on product instead of infrastructure. As a result, we were able to bring a transformative new product to market in half the time."

I’ve tested many speech-to-text APIs (Google, AWS, IBM) and AssemblyAI consistently wins. Highly recommend for devs.

Nico R.

Developer & Co-founder

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Nathan Webb

Product Manager at Aloware

"The accuracy was strong, but the great documentation and unique models like Auto Chapters and Sentiment Analysis is what really won us over."

Learn how Veed.io helps users produce high-quality videos.

We’re shaping the tides of Speech AI

Deep dive into insights, industry breakthroughs, and trending innovations.

report

Universal-1 surpasses industry milestones

Our latest multilingual speech model is trained on over 12.5M hours of audio data and ranks industry best across English, Spanish, German, and French.

An illustration showing AssemblyAI's audio intelligence modelsRead report
youtube

Innovations, education, and technical tutorials

Explore our YouTube channel for weekly videos on the latest AI innovations and tutorials on how to build AI features fast.

An illustration showing AssemblyAI's audio intelligence modelsExplore YouTube
Blog

AI trends in 2024: Graph Neural Networks

Discover how this cutting-edge technology is powering production applications and may be changing the future of AI.

An illustration showing AssemblyAI's audio intelligence modelsRead article
Blog

Top 5 security questions for protected speech products

Learn the top questions developers should be asking API providers to ensure customer data is safeguarded every step of the way.

Speech-to-text SecurityRead article

The code to meaningful
voice data

Partner with the leader in Speech AI to build powerful products with breakthrough industry impact.

Try our API for freeContact sales
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import assemblyai as aai

transcriber = aai.Transcriber()
transcript = transcriber.transcribe(URL, config)

print(transcript)
{
  "id": "6rlr37h8f4-e310-4e23-bbf3-ea5f347dc684",
  "language_code": "en_us",
  "status": "completed",
  "text": "Runner's knee is a condition characterized by pain behind or around the kneecap...",
  "confidence": 0.98122,
  "audio_duration": 3200,
  "words": [
    { "text": "Runner's", "start": 0, "end": 550, "speaker": "A", "confidence": 0.98113 },
    { "text": "knee", "start": 580, "end": 1130, "speaker": "A", "confidence": 0.95417 }
  ]
}