Quick answer: An AI voice agent has two costs. The first is the build: a custom agent connected to your calendar, CRM and transfer rules typically costs $1,000 to $5,000 once. The second is running it: you pay per minute of conversation, usually around $0.06 to $0.15 a minute for the full stack, plus a few small monthly fees. For a clinic taking 400 calls a month, that comes to roughly $155 to $235 a month. A full time receptionist costs about $3,170 a month in wages alone.
Key takeaways
- The "per minute" price on most pricing pages covers only part of the bill. The AI model, the voice and the phone line often charge separately.
- Build cost depends on what the agent connects to, not on how clever it sounds. Booking into a real calendar and transferring calls with a summary take most of the setup work.
- Small businesses usually spend more on the build than on minutes in the first year. After that, the monthly bill stays low unless call volume jumps.
- Compare an AI agent with the calls you miss today, not with a perfect receptionist. Most small teams compare it with voicemail.
- Keep a person in the loop. The cheapest setup that frustrates callers costs more than a slightly pricier one that hands off well.
Want your exact number instead of a range? Our free audit counts your real call volume and quotes one fixed price for the build.
Book a free automation auditWhat you actually pay for
An AI voice agent bill has two parts: a one time build and a monthly running cost. Vendors tend to talk about only one of them, depending on what they sell.
The build covers the work that makes the agent useful for your business:
- Writing the call flows, greeting and answers in your voice
- Connecting the agent to your booking system so it books real slots
- Setting transfer rules, so complex or upset callers reach a person with a summary
- Logging every call, transcript and outcome in your CRM
- Testing against your hardest real call scenarios before launch
The running cost covers the minutes the agent spends on the phone and the tools underneath it. A self serve platform skips most of the build, but you still do that work yourself, or you live without it.
The per minute price stack, explained
Every minute of an AI phone call runs through four layers, and each one has a price. Here are the published rates from two common platforms, checked in October 2026.
| Layer | What it does | Retell AI (pay as you go) | Telnyx Voice AI |
|---|---|---|---|
| Voice engine | Handles turn taking, interruptions and speech to text | $0.055 a minute | $0.05 a minute, speech to text and voice included |
| Voice (text to speech) | Turns the agent's words into speech | $0.015 a minute for standard voices; up to $0.10 for premium ElevenLabs voices | Included above |
| AI model | Decides what to say | About $0.01 to $0.08 a minute depending on the model | About $0.006 a minute for a low cost model; frontier models cost more |
| Phone line | Carries the call | $0.015 a minute | From $0.0032 a minute |
| Typical total | About $0.11 a minute with a mid range model | About $0.06 a minute, by Telnyx's own estimate |
Sources: Retell AI pricing and Telnyx Voice AI pricing. If you bring your own phone line, carrier rates run lower still: Twilio charges $0.0085 a minute to receive a call on a US local number.
Three things push the per minute number up:
- Premium voices. A more natural voice can cost more than six times as much as a standard one. Test the standard voice first; callers often cannot tell.
- Bigger AI models. A top tier model can cost three to eight times more a minute than a small one. Most receptionist work (booking, hours, directions, intake questions) runs well on a smaller model.
- Add ons. Knowledge base lookups, noise filtering, removing personal data from transcripts and quality checks each add a little per minute.
Not sure which voice or model your calls need? We test both on your real call scenarios before you pay the final invoice.
See how our AI voice agents workA worked monthly bill for a small clinic
Here is a made up example to show the math. These are not client figures.
A clinic receives 400 calls a month. The average call lasts 3 minutes, so the agent talks for 1,200 minutes.
| Line item | How we got it | Monthly cost |
|---|---|---|
| Call minutes | 1,200 minutes × about $0.11 | About $132 |
| Phone number | One local number | About $2 |
| Workflow tools | Connects the agent to the calendar, CRM and text messages | About $20 to $100 |
| Total running cost | About $155 to $235 a month |
Add the one time build, typically $1,000 to $5,000 depending on how many tools the agent connects. In year one, a mid range build of $3,000 plus 12 months of running costs comes to roughly $4,900 to $5,800.
Your number moves with three things: how many calls you get, how long they last and how much the agent connects to. A law firm with fewer but longer intake calls can land in the same range. A busy home services company with 1,500 calls a month will pay more for minutes but the same for the build.
Want this bill worked out with your real call logs? The free audit pulls your actual volume and gives you a written roadmap with a fixed price.
Get your free auditAI voice agent vs receptionist vs answering service
Compare the three options on the same call volume. Here is the clinic again at 400 calls and 1,200 minutes a month.
| Option | Monthly cost | Hours covered | What it handles well | Where it falls short |
|---|---|---|---|---|
| AI voice agent | About $155 to $235, plus a one time build | 24 hours a day, 7 days a week | Routine calls, booking, after hours, overflow when staff are busy | Judgment calls, upset callers, anything clinical or legal |
| Live answering service | About $1,400 to $6,000 | Depends on plan | Taking messages with a human voice | Usually takes messages instead of booking; you pay per minute or per call |
| Full time receptionist | About $3,170 in wages, before taxes and benefits | About 40 hours a week | Relationships, complex questions, in person tasks | Evenings, weekends, lunch breaks, two calls at once |
How we got these numbers: the receptionist figure uses the median receptionist pay of $38,010 a year from the US Bureau of Labor Statistics (May 2025 data). The answering service range uses live service rates of $1.43 to $5.00 a minute, as compiled in CloudTalk's answering service price guide, and per call rates of $3.50 to $5.25, as listed in Famulor's platform comparison. Both publishers sell AI phone products, so treat their ranges as a guide.
For most small teams, the real choice is not "AI or receptionist." It is "AI or voicemail." The agent answers the calls your receptionist cannot: the second line ringing, the lunch hour, and the 7 pm caller who would otherwise ring a competitor. Our post on speed to lead shows why those after hours calls matter so much.
Hidden costs that pricing pages leave out
Most surprises on an AI voice agent bill come from five places:
- Rounding. Some platforms round every call up to a full minute. A 20 second wrong number then costs as much as a 60 second call. Telnyx notes this on its own pricing page.
- Transfers. When the agent hands a call to a person, the AI fee stops, but you keep paying for the phone line until the call ends. Retell's pricing FAQ says this directly.
- Concurrent calls. Platforms often include a set number of calls at once and charge for more. Retell includes 20 and then charges $8 a month for each extra line. A small clinic rarely needs more, but a busy dispatch desk might.
- Silence and hold time. Billing continues while a caller looks for their insurance card. Long holds add up.
- Your own time. A self serve tool costs less per month but needs someone to write prompts, test edge cases and fix things when a booking fails. Our step by step guide on how to set up an AI voice agent shows exactly what that work involves.
Self serve platform or custom build: which one fits
Pick by how much the phone matters to your revenue, not by the sticker price.
Choose a self serve platform if:
- You mostly need after hours message taking
- Your booking happens on a simple online calendar
- Someone on your team enjoys testing and tweaking
- Your budget is under $1,000 to start
Choose a custom build if:
- The agent must book into your practice software or CRM
- Calls need routing by service, location or urgency
- You work in healthcare, legal or finance, where handoff rules and data handling matter
- You want every call logged with a transcript and a follow up task, without anyone copying details by hand
A custom build typically costs $1,000 to $5,000 once, plus $50 to $300 a month to run, depending on call volume. You own every account it runs on. The home services answering guide walks through the same decision for contractors.
Ready to see which route fits your calls? Tell us how your phones work today and we will tell you honestly, even if the answer is a $50 a month tool you can set up yourself.
Book your free auditIs an AI voice agent worth it? The payback math
Multiply three numbers to see what missed calls cost you each month:
Missed calls per month × share that would have booked × average value of a booking
A made up example, not client figures: a clinic misses 60 calls a month. If one in four would have booked and the average visit is worth $150, the clinic leaves $2,250 on the table each month. A voice agent that recovers even a third of those bookings brings in about $750 a month. That covers the running cost several times over and pays back a $3,000 build in about six months.
Two numbers decide whether it pays for you: how many calls you miss, and what one booking is worth. Check your phone system's missed call report for one week before you buy anything.
For the full cost picture across every kind of automation, see how much AI automation costs in 2026.
Compliance costs to plan for
Rules do not show up on a pricing page, but they shape what you build:
- Outbound calls need consent. In February 2024 the FCC confirmed that AI generated voices count as "artificial" voices under the TCPA, so outbound AI calls need the caller's prior consent (Cooley's summary of the ruling). The ruling targets outbound calls, not inbound answering, but AI reminder and follow up calls can fall under it. Collect consent before you switch them on.
- Recording consent varies by state. Some US states require every party on a call to agree to recording. Put a short disclosure in the greeting.
- Healthcare needs HIPAA appropriate platforms. Choose vendors that sign a business associate agreement, and keep clinical questions with your staff. Our post on voice agents for clinics covers where to draw that line.
These rules rarely add much to the monthly bill. They add time to the build, which is one more reason the build costs more than the minutes.
What our builds include
We build AI voice agents at a fixed price, typically $1,000 to $5,000, with $50 to $300 a month in platform and call fees. Every build includes call flows written in your voice, booking into your live calendar, warm transfers with a summary, missed call text back, CRM logging and 30 days of support. You listen to test calls and approve the voice before it ever answers a real customer, and you own every account it runs on.
Frequently asked questions
How much does an AI voice agent cost per month?
Most small businesses pay $50 to $300 a month to run an AI voice agent, depending on call volume. The bill is mostly call minutes at roughly $0.06 to $0.15 each, plus a phone number and workflow tools. A clinic with 400 three minute calls a month pays about $155 to $235.
How much does it cost to set up an AI voice agent?
A custom build connected to your calendar, CRM and transfer rules typically costs $1,000 to $5,000 once. A self serve platform can cost little or nothing to start, but you do the setup, testing and maintenance yourself.
Is an AI voice agent cheaper than a receptionist?
Yes, by a wide margin on cost alone. A full time receptionist earns a median of $38,010 a year in the US, about $3,170 a month before taxes and benefits. An AI agent costs a fraction of that, but it handles routine calls only. Most businesses use it to cover evenings, weekends and overflow, not to replace staff.
What is the cost per minute of an AI voice agent?
Expect about $0.06 to $0.15 a minute for the full stack: voice engine, voice, AI model and phone line. Premium voices and larger AI models can push it past $0.20. Always check whether a quoted rate includes all four layers.
Are there hidden fees with AI phone agents?
Watch for calls rounded up to a full minute, phone line charges that continue after a transfer, fees for extra concurrent calls, and billing during hold or silence. Ask any vendor to show a sample bill at your call volume.
How long does it take to build an AI voice agent?
One to two weeks for a straightforward answering and booking agent, and two to four weeks for a full system with transfers, CRM logging and missed call text back.
Do I own the AI voice agent you build?
Yes. Phone numbers, recordings, transcripts and workflows run in accounts registered to your business. If you stop working with us, the agent keeps answering.
Related reading
- How to set up an AI voice agent for your business
- Speed to lead: what your lead response time really costs
- How much does AI automation cost in 2026?
- AI automation versus hiring a virtual assistant
- AI voice agents for healthcare clinics: fewer no shows, no missed calls
Sources
- Retell AI pricing, checked October 2026
- Telnyx Voice AI pricing, checked October 2026
- Twilio Voice pricing, United States, checked October 2026
- US Bureau of Labor Statistics, Occupational Outlook Handbook: Receptionists, May 2025 data
- CloudTalk, How much does an AI answering service cost, September 2026
- Famulor, AI voice agent pricing 2026: what 10 platforms actually cost per minute
- Cooley, FCC: AI generated robocalls illegal under the TCPA, February 2024