Enterprise Voice AI: STT, TTS & Agent APIs for accurate, realistic, and cost-effective voice solutions.
Visit WebsiteThe Bottom Line
Entry price
Free plan available, paid tiers above
Biggest pro
Fast transcription
Biggest con
Newer player
TL;DR - Deepgram
- AI speech-to-text API
- Fast, accurate transcription
- Real-time and batch processing
What is Deepgram?
Available on: Web
Pros & Cons
Pros
- Fast transcription
- Good accuracy
- Real-time support
- Developer friendly
- Competitive pricing
Cons
- Newer player
- Language limitations
- Enterprise features limited
- Documentation gaps
- Smaller community
Ratings Across the Web
Deepgram holds an aggregate rating of 4.6 out of 5 from 475 reviews across G2, last checked August 26, 2026.
Ratings aggregated from independent review platforms. Learn more
Key Features
Pricing Plans
Free TrialPricing checked Aug 20, 2026
Pay As You Go
Free
Usage-based with $200 free credit (~43,000 minutes Nova transcription)
- $200 free credit (no expiration)
- No credit card required
- Nova-3 STT at $0.0077/min (mono) or $0.0092/min (multi)
- Nova-1/2 STT at $0.0058/min
- Flux STT at $0.0077/min
- Aura-2 TTS at $0.030/1K characters
- Aura-1 TTS at $0.015/1K characters
- Voice Agent API from $0.050/min
Growth
$4,000/year (minimum)
Pre-paid credits with up to 20% savings and higher concurrency
- Up to 20% discount vs Pay As You Go
- Nova-3 STT at $0.0065/min (mono) or $0.0078/min (multi)
- Nova-1/2 STT at $0.0047/min
- Flux STT at $0.0065/min
- Aura-2 TTS at $0.027/1K characters
- Aura-1 TTS at $0.0135/1K characters
- Voice Agent API from $0.041/min
- 100 REST API concurrent connections
Enterprise
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Custom pricing for large volumes, specific deployment, or support needs
- Custom volume pricing
- Custom concurrency limits
- Dedicated support
- Custom deployment options
- SLA guarantees
- On-premises available
Is Deepgram worth the price?
Deepgram is the best-value speech AI platform for developers, and it is not close.
The $200 free credit with no expiration gives you ~43,000 minutes of Nova transcription to build and test with, more generous than any competitor. Nova-3 at $0.0077/minute ($0.46/hour) delivers accuracy rivaling OpenAI Whisper at roughly half the cost, with real-time streaming, speaker diarization, and 30+ languages.
The per-second billing is a genuine differentiator: competitors like AssemblyAI and AWS Transcribe round to the nearest second or 15-second increment, which inflates costs 5-15% on short audio clips. The Growth plan ($4K/year minimum) saves up to 20% and increases WebSocket concurrency from 150 to 225, worth it once you are spending $350+/month consistently.
The Voice Agent API ($0.050-0.163/min depending on BYO components) positions Deepgram as a full voice AI stack, not just a transcription service. Main caveat: the older Enhanced and Base models are more expensive than Nova while being less accurate, always use Nova-3 or Flux unless you have a specific legacy reason.
Hidden Costs & Gotchas
Add-on features stack up
speaker diarization ($0.002/min) and PII redaction ($0.002/min) each add ~26% to the base Nova-3 price. A fully-featured transcription pipeline (Nova-3 + diarization + redaction + keyterm prompting) costs $0.0130/min vs $0.0077 base, a 69% premium.
Multilingual Nova-3 costs 19% more than monolingual ($0.0092/min vs $0.0077/min). If your audio is consistently in one language, always use the monolingual model to save.
The $200 free credit is not renewable, once spent, you are on metered billing. Auto-reload defaults to $100 when balance drops to $10, which can surprise developers who forget to set billing alerts.
Whisper Cloud (self-hosted Whisper model via Deepgram) is limited to 5 concurrent connections on all plans. If you need Whisper specifically at scale, you may need to self-host.
Voice Agent API pricing tiers are confusing
Standard ($0.075/min) includes Deepgram STT + TTS + LLM. BYO TTS drops to $0.065/min, BYO LLM to $0.056/min, BYO both to $0.050/min. The Advanced tier ($0.163/min) is 2x the cost with unclear feature differentiation.
Growth plan requires a $4,000/year minimum commitment. Credits are pre-paid and redeemed against usage, if your usage drops, unused credits do not roll over (verify terms).
Audio Intelligence (summarization, sentiment, topics) uses a separate per-token pricing model ($0.0003-0.0006/1K tokens) that is difficult to estimate in advance since token count depends on audio content length and complexity.
How Deepgram Compares to Competitors
Deepgram is the price-performance leader in speech-to-text.
At $0.0077/minute for Nova-3, it is 2-3x cheaper than Google Cloud Speech-to-Text ($0.012-0.02/min), 3-5x cheaper than AWS Transcribe ($0.024/min), and 10-15x cheaper than AssemblyAI ($0.12-0.15/min for their best model). The accuracy gap has narrowed significantly, Nova-3 matches or exceeds Whisper large-v3 on most benchmarks while running in real-time. AssemblyAI differentiates with higher accuracy on difficult audio (heavy accents, background noise) and built-in summarization, making it the choice when accuracy matters more than cost. OpenAI Whisper API ($0.006/min) is slightly cheaper per-minute but offers no streaming, no diarization, and no speaker labeling, it is batch-only. Google and AWS charge more but offer deep ecosystem integration (Vertex AI, Amazon Connect). For most developers building voice features, Deepgram offers the best combination of price, speed, accuracy, and developer experience. The addition of TTS (Aura) and Voice Agent API makes it increasingly a one-stop shop for voice AI.
Reviews
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Deepgram FAQ
How does Deepgram support real-time voice applications?
Which teams would benefit most from Deepgram's offerings?
How is Deepgram priced?
Can Deepgram be trained for specific industry terminology?
What kind of trade-offs should users consider when choosing Deepgram?
How does Deepgram compare to AssemblyAI for transcription accuracy?
Source: deepgram.com