Vapi AI vs. Retell AI vs. TopCalls: Full Pricing for 10,000 Calls/Month

Vapi AI advertises $0.05 per minute. Retell AI starts at $0.055. Both numbers look great on a pricing page.

But your actual invoice? That's a different story.

Once you add speech-to-text, text-to-speech, LLM processing, and telephony, Vapi's $0.05 becomes $0.15-0.30. Retell's $0.055 becomes $0.10-0.15. And neither includes campaign management, CRM integration setup, or a human who picks up the phone when something breaks.

We ran the math for a real scenario: 10,000 outbound sales calls per month, 3 minutes average duration, 30,000 total minutes. Here's what each platform actually costs when you add every line item. (If you're comparing more than three platforms, check our ranking of 12 AI cold calling tools by cost per meeting.)

1. What Does Vapi AI Actually Cost Per Minute?

Vapi charges $0.05/min as a platform fee. That covers orchestration and hosting. Everything else is billed separately, and the list is long:

Speech-to-Text: $0.01/min (Deepgram or AssemblyAI)

Text-to-Speech: $0.02-0.05/min depending on voice provider (ElevenLabs is the priciest at $0.04+)

LLM Processing: $0.003-0.08/min depending on model. GPT-4o runs about $0.06/min, Claude Sonnet lands around $0.04/min

Telephony: Bring your own Twilio or Telnyx account. Typical cost: $0.01-0.02/min

HIPAA/PCI Compliance: Add $1,000/month if you need it

Add those up for a standard production setup (Deepgram STT, ElevenLabs TTS, GPT-4o, Twilio telephony):

$0.05 + $0.01 + $0.04 + $0.06 + $0.015 = $0.175/min

Use a cheaper TTS and a lighter model? You can push it down to $0.11-0.13/min. Want premium voice quality and a capable LLM? You're looking at $0.25-0.30/min.

Vapi gives you 60 free minutes at signup and $10 in credits. After that, pure pay-as-you-go. No ongoing free tier.

One thing Vapi does well: it's developer-first. If your engineering team wants to build custom voice applications with full control over every component, the modular pricing makes sense. You pick your providers. You tune your stack.

But if you're a sales team trying to run outbound campaigns? You'll spend weeks wiring together STT, TTS, LLM, and telephony providers before making your first call.

2. What Does Retell AI Actually Cost Per Minute?

Retell's base rate is $0.055/min for their voice infrastructure. Unlike Vapi, Retell bundles more into that base price. But not everything.

Here's what stacks on top:

Text-to-Speech: $0.015/min for most voices (Retell Platform, OpenAI, Cartesia). ElevenLabs jumps to $0.04/min

LLM Processing: Varies by model. GPT-4.1 costs $0.045/min. Claude Haiku: $0.025/min. Gemini Flash: $0.006/min

Telephony: $0.015/min through Twilio or Telnyx

Monthly extras: Phone numbers ($2/month each), knowledge base ($8/month after 10 free), extra concurrency ($8/month per slot beyond 20), branded caller ID ($0.10/outbound call)

For a standard setup (Retell TTS, GPT-4.1, Twilio):

$0.055 + $0.015 + $0.045 + $0.015 = $0.13/min

Swap in Gemini Flash and keep the default TTS? You can hit $0.08-0.09/min. Go premium with ElevenLabs and a heavier model, and you're at $0.17+/min.

Retell also offers $10 in free credits and 60 free minutes to start. Their enterprise tier (for teams spending $3,000+/month) can negotiate the base rate down to $0.05/min.

Compared to Vapi, Retell's pricing is more straightforward. The documentation is clearer, and you don't need as many external provider accounts. But you're still assembling components. Still debugging a multi-vendor stack when calls drop or latency spikes.

3. What Does TopCalls Cost Per Minute?

$0.35/min. That's it.

No separate telephony bill. No LLM charges. No TTS add-ons. No per-number monthly fees. SIP trunking, AI processing, voice synthesis, speech recognition, CRM sync, campaign management, and compliance tools are all baked in. Native integrations with Salesforce, HubSpot, Pipedrive, and 5,000+ apps through Zapier come standard.

You also get a dedicated account manager. A real person, not a chatbot or a ticket queue. The TopCalls team handles onboarding: platform config, voice model setup, CRM connections, first campaign prep. Most teams are live and making calls in 2 weeks. That speed matters more than it sounds.

Vapi and Retell require 6-8 weeks of engineering before your first real campaign runs. If your sales team books 50 meetings/month at $500 average deal value, those 4-6 extra weeks of setup cost you $25,000-37,500 in delayed pipeline. That number doesn't show up on any pricing page.

Is $0.35/min more than Retell's $0.13? On the sticker, yes. But that comparison ignores everything outside the per-minute rate. Our AI voice agents run 63,000+ calls daily with sub-500ms voice latency across 29+ languages. More on the real cost gap in a minute.

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4. Side-by-Side: 10,000 Calls at 3 Minutes Each

10,000 calls. 3 minutes average. 30,000 total minutes per month. Here's the math.

Vapi AI (Standard Setup)

Platform fee: 30,000 x $0.05 = $1,500

STT (Deepgram): 30,000 x $0.01 = $300

TTS (ElevenLabs): 30,000 x $0.04 = $1,200

LLM (GPT-4o): 30,000 x $0.06 = $1,800

Telephony (Twilio): 30,000 x $0.015 = $450

Phone numbers (5): ~$10/month

Total: ~$5,260/month ($0.175/min effective rate)

Budget setup (cheaper TTS + lighter model): ~$3,600/month ($0.12/min)

Retell AI (Standard Setup)

Base rate: 30,000 x $0.055 = $1,650

TTS (Retell Platform): 30,000 x $0.015 = $450

LLM (GPT-4.1): 30,000 x $0.045 = $1,350

Telephony: 30,000 x $0.015 = $450

Phone numbers (5): ~$10/month

Total: ~$3,910/month ($0.13/min effective rate)

Budget setup (Gemini Flash + default TTS): ~$2,550/month ($0.085/min)

TopCalls

Everything included: 30,000 x $0.35 = $10,500

Total: $10,500/month ($0.35/min, all-inclusive)

TopCalls costs more per minute on paper. That's obvious. But the comparison changes when you add what Vapi and Retell don't include.

A conservative engineering estimate: $5,000 for initial setup (integration, testing, prompt design) amortized over 6 months, plus $1,500/month for ongoing maintenance and vendor management. Add that to the monthly totals:

Vapi with engineering overhead: ~$5,260 + $2,333 = ~$7,593/month

Retell with engineering overhead: ~$3,910 + $2,333 = ~$6,243/month

TopCalls (everything included): $10,500/month

The gap narrows from 3x to about 1.4-1.7x. And that estimate is generous. It doesn't include the $25,000+ in delayed pipeline from a longer setup period.

5. Hidden Costs That Don't Show Up on Pricing Pages

The per-minute math above misses the biggest expense: your team's time.

Engineering setup (Vapi/Retell): Both platforms require technical integration. You're connecting STT, TTS, LLM, and telephony providers. Building call flows. Handling edge cases like call drops, latency spikes, and provider outages. A mid-level engineer costs $75-100/hour. Budget 40-80 hours for initial setup, plus ongoing maintenance. That's $3,000-8,000 before your first campaign runs.

Prompt engineering: Your AI agent is only as good as its scripts. Vapi and Retell hand you a blank canvas. Someone on your team needs to understand conversational AI design to write prompts that actually convert. TopCalls handles script design and optimization during onboarding. No extra charge.

Multi-vendor debugging: When a Vapi call has latency issues, is it Deepgram? ElevenLabs? OpenAI? Twilio? Your team chases the problem across four different dashboards. With TopCalls, one team owns the entire stack. One support channel. One throat to choke.

Compliance: TCPA, TSR, and GDPR compliance isn't optional for outbound sales calling. Vapi and Retell give you the infrastructure, but compliance configuration is on you. TopCalls builds compliance tools directly into the platform, and the onboarding team configures them for your use case.

CRM integration: Both competitors offer APIs and webhooks. But wiring them into Salesforce or HubSpot so call outcomes, transcripts, and next steps sync automatically? That's another 20-40 hours of engineering. TopCalls ships native CRM integrations that work on day one.

For teams already running an engineering org focused on voice AI, these costs are manageable. For a sales team that wants to make calls and book meetings? They're deal-breakers.

Want to see how these hidden costs affect your specific numbers? Run our ROI calculator. It factors in team size, call volume, and current cost per meeting.

6. What It Actually Costs Per Booked Meeting

Per-minute pricing is the wrong lens for sales teams. The metric that matters is cost per booked meeting. And that's where the math shifts.

A DIY setup on Vapi or Retell, with default prompts and no dedicated script optimization, typically converts 1.5-2% of connected calls into booked meetings. TopCalls, with white-glove onboarding and scripts tuned by the team that built the platform, averages 3-4% connect-to-meeting rates.

The math for 10,000 calls with a 40% connect rate (4,000 conversations):

Vapi at 2% conversion: 80 meetings from $7,593/month = $94.91 per meeting

Retell at 2% conversion: 80 meetings from $6,243/month = $78.04 per meeting

TopCalls at 3.5% conversion: 140 meetings from $10,500/month = $75.00 per meeting

TopCalls books 75% more meetings from the same 10,000 calls and costs less per meeting than either alternative. The per-minute premium pays for itself in conversion rate.

These aren't hypothetical numbers. TopCalls processes 63,000+ calls daily, and the 60%+ connect rate improvement comes from years of optimizing scripts, retry logic, and voice models across thousands of campaigns.

7. When Each Platform Makes Sense

Vapi AI Works Best For

Developer teams building custom voice applications (IVR systems, customer service bots, voice-first products). Companies that want maximum control over every component. Teams with existing telephony and LLM provider relationships they want to keep. If your use case goes beyond sales calling (healthcare triage, appointment reminders, interactive voice menus), Vapi's flexibility is a real advantage.

Retell AI Works Best For

Mid-market teams with in-house engineers who want a simpler developer experience than Vapi. Companies comfortable with API-first tools that can handle integration work themselves. Budget-conscious projects where Gemini Flash or a lighter model keeps costs under $0.10/min. Retell's documentation is solid, and the learning curve is gentler than Vapi's.

TopCalls Works Best For

Sales teams running outbound campaigns who need results, not a development project. Companies without dedicated voice AI engineers. Teams that value speed (live in 2 weeks, not 2 months). Organizations that need compliance, CRM sync, and sales acceleration tools from day one. And anyone who'd rather talk to a dedicated account manager than file a GitHub issue.

For a deeper look at feature differences (not just pricing), read our full comparison of TopCalls vs. Bland AI vs. Retell.

8. When TopCalls Isn't the Right Fit

We'd be dishonest if we said TopCalls is the answer for everyone.

If you're building a custom voice product (not sales calling), Vapi's modular architecture gives you flexibility TopCalls doesn't. You can swap TTS engines, experiment with different LLMs, and build completely custom call flows that go way beyond outbound sales.

If your team has strong engineers and you want per-minute costs as low as possible, Retell with Gemini Flash can hit $0.08-0.09/min. For high-volume, low-complexity calls (appointment reminders, simple surveys), that price difference adds up fast at 50,000+ minutes/month.

And if you're a solo founder making 200 calls a month, you probably don't need a platform with dedicated account management and enterprise compliance. Start with Retell's free credits, see if AI calling works for your use case, then scale up when the volume justifies it.

9. The Bottom Line on Voice AI Platform Costs

The cheapest per-minute rate doesn't always mean the cheapest total cost. Vapi's $0.05 becomes $0.15-0.25 once you add the required components. Retell's $0.055 lands around $0.10-0.15 for a production setup. TopCalls' $0.35 includes everything, including the humans who make it work.

Your call volume, team size, and engineering capacity determine which platform is the best deal. A 10-person dev shop building custom voice products has different needs than a sales team that wants 1,000 outbound calls running by next Friday.

Want to see the real numbers for your setup? Run our ROI calculator or book a 15-minute strategy call and we'll build a custom cost comparison for your team.