Vapi vs Retell AI
Voice agent platforms compared -- what the advertised price doesn't tell you.
Every number cited. Every source linked. No affiliation with any provider.
Quick Verdict
Retell AI is 51% cheaper at 10,000 minutes/month ($700 vs $1,443 Vapi). Vapi offers more configuration flexibility with thousands of model combinations. Both require technical teams; neither is plug-and-play.
Retell Cost Advantage
At 10,000 min/month
Vapi Base Fee
Platform fee only
Retell Base Fee
Includes voice engine
Head-to-Head Comparison
The headline per-minute rate tells only part of the story. Vapi advertises a lower base fee ($0.05/min vs $0.07/min), but the effective cost with all required services reverses the ranking.
Based on publicly available data as of March 2026. Actual performance may vary.
Vapi's $0.30–$0.33/min with all required services (STT, TTS, LLM, telephony). Retell's $0.13–$0.31/min fully configured (includes base voice engine).
The Pricing Transparency Problem
Vapi charges a $0.05/min platform fee, but STT, TTS, LLM, and telephony are billed separately through their respective providers. The effective cost of $0.32-$0.33/min means the platform fee represents only about 16% of the actual per-minute cost. This leads to 5 separate invoices: platform, STT, TTS, LLM, and telephony.
Retell uses a different approach. Their $0.07/min base includes the voice engine. Only LLM agent costs and telephony are additional, resulting in a more predictable total. There are no hidden platform fees.
| Cost Component | Vapi | Retell AI |
|---|---|---|
| Platform fee | $0.05/min | Included in base |
| Voice engine (STT + TTS) | Separate invoices | $0.07-$0.08/min |
| LLM agent | Separate invoice | $0.006-$0.06/min |
| Telephony | Separate invoice | $0.015/min |
| Effective total | $0.30-$0.33/min | $0.13-$0.31/min |
Retell voice engine and LLM agent costs from Retell AI Pricing. Vapi cost breakdown from Vapi Pricing and Retell's Vapi Review.
Cost at Scale
The cost difference compounds as volume increases. At 10,000 minutes/month, Retell saves $743/month compared to Vapi. Over a year, that is $8,916 in savings.
| Volume | Vapi (est.) | Retell AI (est.) | Savings |
|---|---|---|---|
| 10,000 min/mo | $1,443 | $700 | $743/mo |
| Annual (10K/mo) | $17,316 | $8,400 | $8,916/yr |
| Enterprise budget | $40K-$70K/yr | Lower at volume | Volume-dependent |
10K min/mo costs sourced from Retell pricing comparison. Vapi enterprise budget range ($40K-$70K/yr) from Retell's Vapi review.
Feature Comparison
Vapi Strengths
- Developer-friendly API
- Thousands of configurations
- Active community and good docs
Limitations
- 5 separate invoices (platform, STT, TTS, LLM, telephony)
- Per-minute costs compound quickly at scale
- $40K–$70K/year budget for stable enterprise operations
Retell AI Strengths
- No hidden platform fees
- 51% cheaper than Vapi at 10K min/mo
- Modular, transparent component pricing
Limitations
- Less configuration flexibility than Vapi
- Smaller community
- Limited to supported provider combinations
Both platforms support major LLM providers (GPT-4, Claude, Gemini) and integrate with Twilio for telephony. The primary differentiation is in pricing structure and configuration flexibility, not in the underlying capabilities. Vapi's unbundled model gives teams full control over every component. Retell's bundled model simplifies cost prediction and reduces invoice complexity.
When to Choose Which
Choose Vapi when:
- You need maximum configuration flexibility across STT, TTS, and LLM providers
- Your team has the engineering capacity to manage multi-provider integrations
- You value active community support and extensive documentation
- Cost predictability is less important than component control
Choose Retell AI when:
- Cost predictability and simpler billing are priorities
- You want to minimize total cost at 10K+ minutes per month
- Your use case fits within Retell's supported provider combinations
- You prefer a bundled model with fewer invoices to reconcile
A note on sourcing: several cost figures in this comparison originate from Retell's own pricing comparison page and Vapi review. We could not independently verify all effective cost calculations, as they depend on specific provider selections and usage patterns. Teams should run their own cost projections based on their expected provider mix and call patterns.
Sources
- Vapi PricingVerified Mar 4, 2026
- Retell PricingVerified Mar 4, 2026
- Retell Voice AI Platform Pricing ComparisonVerified Mar 4, 2026
- Retell's Vapi AI ReviewVerified Mar 4, 2026
- CloudTalk Vapi AI Plans & PricingVerified Mar 4, 2026
Disclaimer: STT WER, latency, noise robustness, and multi-language data are independently tested by Speko using automated benchmarks. Pricing reflects publicly available rates. TTS, LLM, S2S, and platform data sourced from official documentation. We are not affiliated with any provider listed.
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