Last updated: 2026-05 · 5 min read
Retell AI vs Deepgram (2026): Full Platform vs STT Layer
Our verdict: Use Retell with Deepgram
Retell AI already uses Deepgram under the hood for STT. Choosing between them isn't an either/or — you use Retell as your platform and it handles Deepgram integration. Direct Deepgram makes sense only for custom builds outside Retell.
| Retell AI | Deepgram | |
|---|---|---|
| Best for | Agencies managing multiple clients | Any production voice agent deployment |
| Latency | ~800ms | ~200ms (STT only) |
| Starting price | $0.07/min | $0.0043/min (Nova-3) |
| White-label | Yes | No |
| Setup time | 30 minutes | 10 minutes |
| LLM support | Claude, GPT-4o, GPT-4o mini | STT layer only |
| Rating | 4.8/5 | 4.7/5 |
Retell AI
★★★★Retell AI is the leading voice agent orchestration platform for agencies and developers. It offers the industry's best latency (~800ms), a full agency sub-account model, and native Google Calendar integration. Best choice for most agency deployments.
Pros
- ✓Industry-leading ~800ms voice-to-voice latency
- ✓Full agency sub-account model
- ✓Native Google Calendar integration
Cons
- ✗Less flexible than VAPI for deeply custom tool use
- ✗Agency pricing requires application
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Deepgram
★★★★Deepgram provides the speech-to-text layer powering most production AI voice agents. Its Nova-3 model has industry-leading accuracy, especially for accented English, noisy environments, and medical/legal terminology.
Pros
- ✓Best accuracy for accented English
- ✓Lowest latency STT available (~200ms)
- ✓Specialized models for medical, finance, legal
Cons
- ✗Not a full voice agent platform
- ✗Pricing adds up at very high volume
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Pricing Comparison
Retell AI
Deepgram
When to Choose Each
Choose Retell AI if…
- →Agencies managing multiple clients
- →Mobile notaries and service businesses
- →Developers who want the best out-of-box experience
Choose Deepgram if…
- →Any production voice agent deployment
- →Medical practices requiring high accuracy
- →International callers with accents