Deepgram vs. AssemblyAI

See why 650,000+ developers prefer Deepgram for streaming and batch STT.

Deepgram offers the most accurate streaming STT API
Deepgram far outperforms AssemblyAI in performance benchmarks
Deepgram offers on-premises and cloud APIs

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Based on 500+ reviews

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Deepgram beats AssemblyAI

Build with enterprise-grade speech recognition that's faster, more accurate, and affordable. No compromises.

Flexible deployment
Choose cloud, on-premises, or private cloud to securely manage voice and transcription data with Kubernetes, Docker, and pre-built VM support for easy setup in any environment.
Custom model training
Deepgram offers tailored ASR models optimized with customer-specific data, ideal for industries with specialized jargon, accents, or unique speech patterns.
Enterprise security
Protect customer data privacy and ensure regulatory compliance with HIPAA-compliant transcription.
Innovation leader in voice AI
Deepgram's deep learning models are optimized for speech data and trained on diverse datasets, delivering industry-leading performance in pre-recorded and real-time transcription.
Fast and accurate transcription
Deepgram's speech-to-text outshines AssemblyAI in both speed and accuracy, with domain-specific use case models (e.g. Nova-3 Medical) and custom training options that will give you a competitive edge.
Go beyond transcription
Build a dynamic full-stack voice agent with Deepgram's Voice AI platform, using speech-to-text, custom LLM, and text-to-speech models. Enjoy optimized performance and low latency with our open-source code.

Raising the bar for ASR performance

All the features. Better performance. Lower cost.

Word Error Rate7%
Speed29.8s
Cost$0.0043

Word Error Rate13.6%
Speed143.2s
Cost$0.0108

Word Error Rate (WER) [%] Speed (Median Inference Time [Sec] Per Audio Hour). Lower is better.

38%more accurate than AssemblyAI
5Xfaster than AssemblyAI
3Xcheaper than AssemblyAI

Speech-to-text

Power your products with world-class speech recognition. Everything developers need to build with confidence and ship faster. Unmatched performance guaranteed:

Accuracy: 30% lower word error rate (WER)
Speed: Up to 40x faster inference time
Cost: 3-7x lower price

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Text-to-speech

Generate lightning fast, human-like voices for real-time AI and high throughput applications.

Quality: Human-like tone, rhythm, and emotion
Speed: Less than 250 ms latency
Scale: Cost-efficient and optimized for high-throughput applications

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Voice agents

A unified voice-to-voice API that enables natural-sounding conversations between humans and machines. With one powerful API, create LLM-powered AI agents that listen, think, and speak with the same intelligence and emotive quality that a person can.

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Leading voice teams build with Deepgram

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Trusted by startups and enterprises

Discover the power of our product through real stories.

Explore customer stories

“Twilio’s flexible orchestration capabilities and global communications infrastructure combined with speech recognition powered by Deepgram APIs deliver seamless, low-latency, and human-like AI agent experiences that are powering today’s Voice AI renaissance.”
Andy O'Dower
VP of Product Management, Twilio
"Our voice capabilities powered by Deepgram APIs deliver the accuracy, low latency, and quality our customers need to build reliable, real-time voice agents."
Nikhil Gupta
Founder and CTO, Vapi
“They don't just chase generic benchmarks; they tailor their models to deliver on the metrics that really matter to us.”
Josh Levin
Head of Product, Cresta