# Vapi vs Retell AI: which voice agent platform wins in 2026?

**Source:** https://promtable.com/compare/vapi-vs-retell

> Vapi wins on developer experience, multi-model + multi-TTS flexibility, and feature breadth. Retell wins on low-latency conversation quality and phone-call reliability. Pick Vapi for custom voice apps, Retell for production phone agents.

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Vapi wins on developer experience, multi-model + multi-TTS flexibility, and feature breadth. Retell wins on low-latency conversation quality and phone-call reliability. Pick Vapi for custom voice apps, Retell for production phone agents.

## At a glance

| Dimension | Vapi | Retell AI |
|---|---|---|
| Developer experience | **SDK + dashboard, fast prototyping** ✓ | Dashboard + API |
| Latency (round-trip) | ~800ms typical | **~600ms typical** ✓ |
| Model flexibility | **Claude, GPT, Gemini, Groq, custom** ✓ | OpenAI, Claude, custom |
| TTS providers | **ElevenLabs, Cartesia, Deepgram, PlayHT, OpenAI** ✓ | ElevenLabs, OpenAI, custom |
| STT providers | **Deepgram, AssemblyAI, OpenAI** ✓ | Deepgram, custom |
| Phone (Twilio) integration | First-class | First-class + Vonage |
| Interrupt handling | Solid | **Best in class** ✓ |
| Knowledge base / RAG | Built-in | Built-in |
| Pricing | Per-minute + per-token | Per-minute |
| Best for | Custom voice apps, multi-model flexibility | Production phone agents, lowest latency |

## Verdict

Vapi is the right pick for custom voice apps where developer experience, multi-model flexibility, and feature breadth matter. Retell AI is the right pick for production phone agents where low-latency conversation quality and rock-solid call reliability are the #1 priority. Both are mature enough for production in 2026; the gap is shrinking quarterly.

## When to pick which

- **Vapi** — Custom voice apps, model + TTS flexibility, fast prototyping.
- **Retell AI** — Production phone agents, lowest-latency interrupt handling, call reliability.

## FAQ

### Vapi or Retell for phone calls?

Retell — slightly lower latency + best-in-class interrupt handling for phone agents.

### Vapi or Retell for custom apps?

Vapi — broader model + TTS support, better SDK ergonomics.

### Which is cheaper?

Pricing is comparable per-minute; Vapi's per-token + per-minute model can be lower for short calls, Retell's flat per-minute is predictable.

## Related

- [/alternatives/vapi](https://promtable.com/alternatives/vapi)
- [/glossary/voice-agent-platform](https://promtable.com/glossary/voice-agent-platform)
- [/glossary/interrupt-handling](https://promtable.com/glossary/interrupt-handling)

*Last updated: 2026-06-01*
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Original page: https://promtable.com/compare/vapi-vs-retell
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