Comparison
Retell AI vs Vapi
The developer-flexible voice AI platform.
Best for: Engineering teams who want raw control over the voice pipeline.
Short answer
Pick Retell AI for the fastest path to a production voice agent with less code, a cleaner dashboard, and predictable all-in pricing. Pick Vapi if you need bring-your-own LLM, a custom voice pipeline, or pipeline-level control over streaming, interruption and transports.
Retell AI vs Vapi is the most common decision in voice AI right now — both ship production-grade phone agents, both bill per minute, both integrate with Twilio and the major LLMs. The real difference is philosophy: Retell is an opinionated platform that gets you live in hours; Vapi is a developer toolkit that gives you control at the cost of more glue code. This guide is written by a certified Retell AI consultant who has shipped builds on both.
Where Retell AI wins
- Faster time-to-first-call — Retell ships an inbound agent in hours, Vapi in days
- Cleaner dashboard for non-developers reviewing transcripts
- More opinionated turn-taking model — less prompt engineering to sound human
- Tighter integrations menu out of the box
Where Vapi wins
- Bring-your-own LLM (Anthropic, custom, local)
- Lower-level control of streaming + interruption
- Better suited for highly custom pipelines
Retell AI vs Vapi: decision table
Pick the row that sounds like you.
| Your scenario | Winner | Why |
|---|---|---|
| Inbound receptionist for a clinic, salon or service business | Retell AI | Faster setup, cleaner non-dev dashboard, HIPAA-ready on enterprise. |
| Outbound SDR / cold calling at scale (10k+/day) | Tie | Both work — Vapi is cheaper per minute, Retell is easier to operate. |
| Custom LLM (Anthropic, fine-tuned, local model) | Vapi | Vapi natively supports bring-your-own-LLM and custom model endpoints. |
| Multi-agent / agent orchestration | Retell AI | Retell's multi-prompt agent and tool-call model is more mature out of the box. |
| Lowest possible latency on a custom voice stack | Vapi | Lower-level control of streaming, interruption and transport. |
| Non-technical team owns the agent day-to-day | Retell AI | Better dashboard, transcript review, and prompt-only editing. |
| Strict enterprise procurement (BAA, SSO, SOC2) | Retell AI | Retell signs a BAA on enterprise; Vapi enterprise is available but heavier lift. |
| You already have a strong engineering team and want max flexibility | Vapi | Vapi rewards engineering hours with control. |
Feature-by-feature breakdown
| Feature | Retell AI | Vapi |
|---|---|---|
| Time to first live call | Hours | Days |
| Bring-your-own LLM | Limited (OpenAI, Anthropic, Gemini) | Yes — any OpenAI-compatible endpoint |
| Built-in voice options (TTS) | ElevenLabs, PlayHT, OpenAI, Deepgram, Cartesia | ElevenLabs, PlayHT, Deepgram, Cartesia, custom |
| Telephony | Native Twilio + import your own SIP | Twilio, Vonage, SIP trunks |
| Tool / function calling | First-class, typed | Supported, more wiring |
| Multi-prompt / multi-agent flows | Native multi-prompt agent | Squads (newer, more setup) |
| Dashboard for non-developers | Polished | Developer-first |
| HIPAA / BAA | Yes (enterprise) | Yes (enterprise) |
| Typical pricing model | All-in per-minute | Platform per-min + LLM + voice + telephony billed separately |
| Best for | Production agents shipped fast | Custom pipelines with engineering muscle |
Pricing: Retell AI vs Vapi
Vapi ~$0.05–0.10/min + LLM + voice. Retell ~$0.07/min + LLM + voice. Roughly equivalent all-in.
| Line item | Retell AI | Vapi |
|---|---|---|
| Platform / orchestration | ~$0.07/min | ~$0.05/min |
| LLM (GPT-4o-mini class) | Included in many plans | Pass-through, ~$0.01–0.03/min |
| Voice (ElevenLabs Turbo) | Pass-through, ~$0.07/min | Pass-through, ~$0.07/min |
| Telephony (Twilio US) | ~$0.015/min | ~$0.015/min |
| Typical all-in | ~$0.15–0.18/min | ~$0.13–0.20/min |
Numbers above are typical 2026 list prices for a mid-volume inbound agent on GPT-4o-mini + ElevenLabs Turbo + Twilio US. Enterprise deals on both platforms negotiate down. Vapi's lower platform fee is usually offset by more line items to manage.
Full breakdown: Retell AI pricing breakdown.
The verdict: Retell AI vs Vapi
For 90% of inbound and outbound use cases, Retell ships faster with less code. Pick Vapi when you need a custom LLM or pipeline-level control.
FAQ: Retell AI vs Vapi
Retell AI vs Vapi — which one is better?+
For most teams, Retell AI is better because it ships a production agent in hours with less glue code and a cleaner operator dashboard. Vapi is better when you need bring-your-own LLM, custom voice transports, or pipeline-level control and you have engineering hours to spend.
Is Retell AI cheaper than Vapi?+
All-in cost is roughly equivalent — typically $0.15–0.18/min on a mid-volume inbound agent. Vapi has a lower platform fee but bills LLM, voice and telephony separately, so the totals land in the same range.
Can I use my own LLM on Retell AI?+
Retell supports OpenAI, Anthropic and Gemini natively, plus a custom LLM endpoint on enterprise. Vapi is more flexible here — any OpenAI-compatible endpoint works out of the box.
Which is faster to ship a phone agent on?+
Retell AI. A standard inbound agent (greeting, intent routing, calendar booking, transfer) ships in hours on Retell and typically takes days on Vapi because you assemble more of the pipeline yourself.
Is Vapi better for outbound cold calling than Retell?+
They're close. Vapi is slightly cheaper per minute at volume; Retell is easier to operate. For pure high-volume outbound (10k+/day), also evaluate Bland AI.
Do both Retell AI and Vapi support HIPAA?+
Yes — both sign a BAA on their enterprise plan. See our guide: is Retell AI HIPAA compliant.
Still on the fence? A certified Retell AI consultant will tell you straight which platform fits your use case — or hire the full Retell AI agency to ship the build.
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