AssemblyAI Voice Agent API vs Deepgram Voice Agent API
Pricing last verified from each vendor's own site.
Verdict
AssemblyAI's Voice Agent API costs $4.50/hr (about $0.075/min) and includes speech-to-text, its LLM, text-to-speech and hosting, billed per second, with a free tier. Deepgram's Voice Agent API is $0.075/min Standard pay as you go, with cheaper rates if you bring your own LLM or TTS, and $200 free credit.
- Consider AssemblyAI Voice Agent API if: You want one all-inclusive rate with AssemblyAI's speech models.
- Consider Deepgram Voice Agent API if: You want to swap in your own LLM or TTS for a lower rate, or want the larger free credit.
Factual summary
- Both are listed under Voice AI & Dialers.
- Directly comparable starting prices are not available for both: AssemblyAI Voice Agent API — Voice Agent API $4.50/hr (about $0.075/min) all-in: real-time speech-to-text, turn detection, its Voice Agent LLM, text-to-speech and hosting, billed per second; speech-to-text from $0.15/hr; free tier (no card) includes up to 185 hours of pre-recorded and 333 hours of streaming transcription; volume pricing via sales; Deepgram Voice Agent API — Voice Agent API, pay as you go: Standard $0.075/min ($0.068 on Growth), Standard with your own TTS $0.065/min ($0.051), your own LLM $0.059/min, your own LLM and TTS $0.050/min ($0.041), Advanced $0.163/min ($0.146); $200 free credit; Growth plans from $4K/year; Enterprise via sales.
This is a factual comparison drawn from vendor sites, not a recommendation. Which fits depends on your channels, volume and budget.
| AssemblyAI Voice Agent API | Deepgram Voice Agent API | |
|---|---|---|
| Summary | Speech-to-text API provider with an all-inclusive Voice Agent API for building AI phone agents. | Speech-to-text, text-to-speech and an all-in-one Voice Agent API for building AI phone agents. |
| Starting price | See vendor | See vendor |
| Pricing details | Voice Agent API $4.50/hr (about $0.075/min) all-in: real-time speech-to-text, turn detection, its Voice Agent LLM, text-to-speech and hosting, billed per second; speech-to-text from $0.15/hr; free tier (no card) includes up to 185 hours of pre-recorded and 333 hours of streaming transcription; volume pricing via sales | Voice Agent API, pay as you go: Standard $0.075/min ($0.068 on Growth), Standard with your own TTS $0.065/min ($0.051), your own LLM $0.059/min, your own LLM and TTS $0.050/min ($0.041), Advanced $0.163/min ($0.146); $200 free credit; Growth plans from $4K/year; Enterprise via sales |
| Model | usage | usage |
| Free trial | — | — |
| Free plan | Yes | — |
| Channels | phone | phone |
| Last verified | 2026-10-27 | 2026-10-30 |
FAQ
What is the difference between AssemblyAI Voice Agent API and Deepgram Voice Agent API?
AssemblyAI's Voice Agent API costs $4.50/hr (about $0.075/min) and includes speech-to-text, its LLM, text-to-speech and hosting, billed per second, with a free tier. Deepgram's Voice Agent API is $0.075/min Standard pay as you go, with cheaper rates if you bring your own LLM or TTS, and $200 free credit.
Which is cheaper, AssemblyAI Voice Agent API or Deepgram Voice Agent API?
We can't compare entry prices directly. AssemblyAI Voice Agent API: Voice Agent API $4.50/hr (about $0.075/min) all-in: real-time speech-to-text, turn detection, its Voice Agent LLM, text-to-speech and hosting, billed per second; speech-to-text from $0.15/hr; free tier (no card) includes up to 185 hours of pre-recorded and 333 hours of streaming transcription; volume pricing via sales. Deepgram Voice Agent API: Voice Agent API, pay as you go: Standard $0.075/min ($0.068 on Growth), Standard with your own TTS $0.065/min ($0.051), your own LLM $0.059/min, your own LLM and TTS $0.050/min ($0.041), Advanced $0.163/min ($0.146); $200 free credit; Growth plans from $4K/year; Enterprise via sales.
When should I choose AssemblyAI Voice Agent API over Deepgram Voice Agent API?
Consider AssemblyAI Voice Agent API if: You want one all-inclusive rate with AssemblyAI's speech models. Consider Deepgram Voice Agent API if: You want to swap in your own LLM or TTS for a lower rate, or want the larger free credit.
More options
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