Deepgram vs. AssemblyAI

Learn why customers choose AssemblyAI to build powerful Voice AI apps that exceed industry standards:

Best-in-class Voice AI models
Unlimited concurrency without hidden costs
No commitments or minimums

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Universal-3.5 Pro

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At a glance: Deepgram vs. AssemblyAI

Model

AssemblyAI Universal-3.5 Pro

Deepgram Nova 3

Average Word Error Rate (WER)

5.93%

7.9%

Missed Entity Rate – Medical Terms

13.61%

16.95%

Missed Entity Rate – Locations

8.26%

13.94%

Missed Entity Rate – Date & Time

7.5%

18.69%

Usage-Based Pricing

Contract with spend minimums

Promptable Speech Models

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Go beyond Deepgram's limits with Assembly's full Voice AI Infrastructure

Global Language Support

Transcribe over 99+ languages and counting, including Global English (English and all of its accents).

Realtime Speaker Diarization

Detect the number of speakers in your audio file and identify names and roles with Speaker Identification.

Automatic Language Detection

Automatically detect languages and route to the appropriate model for transcription.

Usage-Based Pricing

Pay only for what you use with transparent per-second billing. No minimum commitments, annual contracts, or surprise infrastructure costs.

Profanity Filtering & PII

Detect and replace profanity in the transcription text with ease. Redact PII and sign a BAA for apps that process PHI.

Proven Reliability and Security

Deploy with confidence on infrastructure that processes millions of hours daily. Built for production scale with 99.9% uptime and SOC 2 Type 2 compliance.

Sub-200ms End-to-End Latency

Best-in-class recognition of credit card numbers, emails, URLs, passwords, and account numbers.

Promptable Speech Models

Guide transcription behavior with natural language prompts in batch and streaming mode. Start with our prompt templates to see what works best for your use case.

Start building

Get your free API key and ship your first transcript in minutes—no commitments or minimums.

Ready to outgrow Deepgram?

Switch to higher accuracy, unlimited concurrency, and usage-based pricing—with no contracts or spend minimums.

Get your API key

The customer experience with our previous provider had significant room for improvement—the pricing model wasn't ideal for our needs, we encountered some concurrency constraints, and the customer service response times were longer than we hoped.

Mark Barbir, CEO at Earmark

Playground

We're not playing around—but you can

Test our best-in-class speech-to-text and voice agent models in our no-code playground.

Explore Playground

Frequently asked questions

: AssemblyAI leads on accuracy with a 5.93% average Word Error Rate versus Deepgram Nova 3’s 7.9%, and a lower Missed Entity Rate across medical terms, locations, and dates. AssemblyAI also offers usage-based pricing with no spend minimums and promptable speech models.
: Yes. AssemblyAI provides unlimited concurrency without extra costs, so you can scale your applications without worrying about rate limits or hidden infrastructure fees.
: AssemblyAI supports over 99 languages with automatic language detection, including Global English and all of its accents.
: AssemblyAI is usage-based with transparent per-second billing and no minimum commitments or annual contracts. Deepgram’s Nova 3 typically requires a contract with spend minimums.
: Yes. AssemblyAI offers simple API integration with SDKs in Python, TypeScript, Go, Java, and Ruby. Our documentation and developer support make migration straightforward.