AI Voice Agent Platform
U
Ultravox
Speech-native multimodal LLM and managed API for real-time voice agents — no ASR stage, no TTS stage, audio in and out.
Speech-native LLM with a managed API — Ultravox v0.7 (GLM 4.6) skips ASR and TTS stages entirely. #1 on VoiceBench. Developer-only; no no-code builder; compliance certs unconfirmed.
Pricing
$0.05 /min
Pay-as-you-go: $0.05/min (30 min free; 5 concurrent calls max). Pro: $100/mo (unlimited concurrency, outbound scheduler, 5 custom voices, 20 RAG corpora). SIP add-on: $0.005/min Pro / $0.0048/min Enterprise. Enterprise: custom SLA.
Free tier
Per minute Flat monthly Custom enterprise
View pricing page →
Verified April 2026
Capabilities
| Capability | Ultravox |
|---|---|
| Transcription | ✓ |
| Summarization | ✗ |
| Sentiment Analysis | ✗ |
| Real-Time Agent Assist | ✗ |
| Autonomous Voice Agent | ✓ |
| Virtual Agent (Chat) | ✗ |
| Conversation Intelligence | ✗ |
| Automated QA | ✗ |
| Intelligent Routing | ✗ |
| Predictive Dialer | ✗ |
| Voice Cloning | ✓ |
| Multilingual | ✓ |
| Coaching Workflows | ✗ |
| Workforce Management | ✗ |
Compliance & Security
No compliance certifications recorded for this vendor.
Integrations
Telephony
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AI Models
meta llamaelevenlabscartesia
Other
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API documented
Alternatives to Ultravox
Frequently asked questions about Ultravox
- What is Ultravox?
- Speech-native LLM with a managed API — Ultravox v0.7 (GLM 4.6) skips ASR and TTS stages entirely. #1 on VoiceBench. Developer-only; no no-code builder; compliance certs unconfirmed.
- How much does Ultravox cost?
- Ultravox starts at $0.05/min. Pay-as-you-go: $0.05/min (30 min free; 5 concurrent calls max). Pro: $100/mo (unlimited concurrency, outbound scheduler, 5 custom voices, 20 RAG corpora). SIP add-on: $0.005/min Pro / $0.0048/min Enterprise. Enterprise: custom SLA. (pricing verified April 2026).
- What channels does Ultravox support?
- Ultravox supports voice.
- What are the top alternatives to Ultravox?
- Alternatives to Ultravox include Vapi, Retell, Bland, Deepgram, and Cartesia. See the alternatives section above for full profiles of each.