Deepgram
Verified BenchmarkSpeech-to-text, TTS and voice-agent APIs at usage pricing
Quality & reliability of primary audio output.
Nova-3 STT
Onboarding & editor ergonomics.
PAYG STT from $0.0043/min · TTS from $0.015/1k chars · Voice Agent $0.075/min · $200 free credit
Scoring Vectors
Deterministic evaluation across the AiRecMark five-dimension rubric (v2-5dim)
# Deepgram — official documentation
"https://deepgram.com"
# Pricing source (T0): https://deepgram.com/pricing
# Entry tier: PAYG STT from $0.0043/min · TTS from $0.015/1k chars · Voice Agent $0.075/min · $200 free credit (checked 2026-09-15)
# Rubric: v2-5dim · recorded features: 4
Quantitative Technical Specification
Core architectural subsystems in production release v2.5
Nova-3 STT
Fast, accurate transcription with auto language detection.
Aura TTS
Streaming text-to-speech voices.
Voice Agent API
Full speech-to-speech agent pipeline.
Keyterm Prompting
Boost accuracy on domain jargon.
Direct Peer Matrix: Voice Synthesis & Conversational Engines
Standardized comparative evaluation using normalized 1,000-character test payloads
| Model & Provider | AiRecMark Score | Pricing Base | Performance (rubric) | Languages | Prosody Fidelity |
|---|---|---|---|---|---|
| Deepgram Leader | 85.1 | PAYG STT from $0.0043/min | 86/100 | — | 88% |
| ElevenLabs | 95.4 | Usage API / Tiered | — | — | — |
| PlayHT | 89.2 | Freemium | — | — | — |
| Cartesia | 85.8 | $5/mo | — | — | — |
| Adobe Podcast | 85.6 | $0/mo | — | — | — |
Commercial Tiers & Compute Allocation
Transparent character pools, concurrent socket capacities, and API rate limits
Entry tier for evaluation and light individual use.
- check Nova-3 STT
- check Aura TTS
- check Voice Agent API
PAYG STT from $0.0043/min · TTS from $0.015/1k chars · Voice Agent $0.075/min · $200 free credit
- check Nova-3 STT
- check Aura TTS
- check Voice Agent API
Dedicated infrastructure, security review, and compliance support.
- check SSO / SAML & audit controls
- check Dedicated support channel
- check Custom quota & SLA
Deepgram stands out for $200 free credit with no expiration. Speech-to-text, TTS and voice-agent APIs at usage pricing anchors its proposition, and AiRecMark's five-dimension audit lands it at 85.1/100 — a pragmatic default for voice-API Product Builders.