The $29 plan is rarely the problem. The billing unit is.
One vendor sells minutes. Another sells answered calls. A developer platform bills orchestration, speech recognition, the language model, the voice and telephony separately. Put the starting prices in one table and the comparison looks simple. Put the same 400 calls through each plan and the cheap option can move to the other end.
Quick answer: a light-use AI receptionist can start near $25–$30 per month. Managed services often start around $150. Developer platforms such as Vapi and Retell commonly land around $0.07–$0.31 per call minute once the selected components are counted. Your real bill depends on both call count and average duration.
Prices checked against public vendor pages on 30 September 2026. Recheck them before buying.
Disclosure: Operant Solo is reader-supported. We may earn an affiliate commission when you purchase through links on this page, at no additional cost to you. Recommendations are based on independent testing and evaluation.
AI receptionist prices at a glance
| Product | Public entry price | Included usage | Billing model |
|---|---|---|---|
| Zoom Virtual Agent Receptionist | $29.99 monthly or $24.99 monthly equivalent when billed annually | 100 minutes | Monthly plan with minutes |
| Smith.ai Free | $0 | 25 calls | Per answered call |
| Smith.ai Pro | $150 monthly | 75 calls | Per answered call |
| Retell AI | $0 to start | No fixed allowance | $0.07–$0.31 per minute |
| Vapi usage only | $0 monthly package fee | Usage billed separately | $0.05 hosting per minute plus providers |
Sources: Zoom, Smith.ai, Retell and Vapi.
This is not a ranking. Zoom and Smith.ai package a receptionist service. Vapi and Retell sell infrastructure for building one. With infrastructure, the missing line on the invoice is your own testing and support time.
The four billing models that get mixed together
- Per minute: you pay for call duration. You need monthly minutes, not just call count.
- Per answered call: a two-minute and ten-minute call may consume the same unit.
- Monthly allowance: the plan includes calls or minutes, then applies an overage rate.
- Component pricing: platform, transcription, model, voice, phone service, recordings and analysis can be separate.
What 300 minutes can cost
Assume 120 calls averaging 2.5 minutes. Retell’s published range puts the voice layer around $21–$93. Vapi starts with about $15 of hosting, then adds the transcriber, model, voice and telephony. Smith.ai bills calls instead of minutes, so those same 120 calls must be priced against a call tier and its overage. Zoom’s entry allowance covers only the first 100 minutes.
The point is not that one vendor wins. “300 minutes” is not enough to price a call-based service, while “120 calls” is not enough to price a minute-based service. Export both numbers from your phone system before comparing plans.
What 1,000 minutes can cost on Vapi or Retell
Vapi lists a $0.05-per-minute hosting fee on usage-only accounts. At 1,000 minutes, hosting is $50 before transcription, model, voice and phone charges. Its public calculator can move materially as you change those components. Optional support packages are separate: Core is $29 per month, while Pro has a $999 monthly minimum.
Retell publishes a configurable $0.07–$0.31-per-minute range. That makes 1,000 minutes roughly $70–$310 before the surrounding workflow, monitoring and staff time. Do not budget from the bottom of the range. Configure the model, voice, number and add-ons you plan to use, then save the dated estimate.
The hidden costs after the demo
Setup and failure testing
A bot that can say hello is not ready. Test booking rules, business hours, transfers, prohibited answers, names, poor connections, background noise and what happens when no person answers.
Workflow ownership
Calendar booking, CRM writes and follow-up messages need integrations. Even a cheap self-hosted workflow needs someone to own credentials, retries, failed runs and updates.
Compliance and retention
Self-hosting one piece does not make the call compliant. Recordings, transcripts, model requests, carriers and analytics may each store data. Verify the contract and full data path. Vapi, for example, lists HIPAA support as a paid add-on.
Human fallback
The hard calls do not disappear. Decide whether the agent transfers to your staff, an answering service or voicemail. Price that fallback and test it outside office hours.
Build or buy?
Build with Vapi or Retell when the call flow is part of your product, you need custom tools and someone technical will own failures. Buy a managed receptionist when the job is standard—answer, qualify, route and book—and your real constraint is time.
Do neither when callers regularly need judgment, emotional care or access to systems you cannot expose safely. Route those calls to a person.
Questions people ask before buying
How much does an AI receptionist cost per month?
Light-use products can start around $25–$30 per month. Managed services often start higher, while developer stacks bill call time and components. Use monthly call count and average duration to estimate your bill.
What does Vapi’s $0.05 per minute include?
It is the Vapi hosting fee. Transcription, the language model, voice and telephony are additional provider costs. Support packages and optional add-ons are separate.
Is Retell cheaper than Vapi?
Not automatically. Retell publishes a configurable range, while Vapi separates its hosting fee from provider charges. Compare the same model, voice, phone route, usage and support level.
How many minutes should I budget?
Export one month of phone logs. Multiply answered calls by average talk time, then add 15–25% for testing, seasonal variation and calls the new service may capture instead of missing.
Is an AI receptionist cheaper than an employee?
Usually on direct answering cost, but it is not a replacement for front-desk judgment, physical work or exception handling. Compare the task being covered, not the job title.
Operating takeaway: never compare AI receptionists by starting price. Price the same calls, average duration, handoff rules and support level. That is the bill you will own.

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