Compare / Ultravox Realtime
Voiceflint vs Ultravox Realtime
Ultravox Realtime runs one speech-native model at $0.05 per minute plus SIP. It is cheap and quick on short calls, but a single model cannot be swapped when task completion drops on long multi-turn conversations. Voiceflint's lowest-cost cascade lands near a cent per minute in models with a text LLM you can change any time.
Where Ultravox Realtime costs you
- Single model; no STT, LLM or TTS choice
- 5 concurrent calls on pay-as-you-go until the $100/month Pro tier
- SIP $0.005/min plus carrier on top
- Speech-native models still trail cascades on multi-turn task completion in Daily's February 2026 benchmark
Where Ultravox Realtime is strong
- Genuinely low time to first audio
- Simple pricing
- A real speech-to-speech option, also available on Voiceflint
Monthly cost, same models
Balanced stack (Deepgram Flux, GPT-5 mini, Inworld TTS-2 Flash) at $0.019/min in models; US phone calls; Ultravox Realtime numbers from https://www.ultravox.ai/pricing on 2026-09-08.
| Minutes / month | Voiceflint | Ultravox Realtime | Difference |
|---|---|---|---|
| 1,000 | $44 | $70 | $26 |
| 10,000 | $443 | $700 | $257 |
| 100,000 | $4,429 | $7,000 | $2,571 |
Single speech-native model; SIP $0.005/min plus carrier. Voiceflint: $0.010/min platform, models at list price plus a 15% managed-key fee ($0 with your keys), telephony $0.012/min.
Other comparisons: VapiRetell AIBland AIElevenLabs AgentsSynthflowDeepgram Voice AgentLiveKit Cloud (DIY)Pipecat Cloud (DIY)