Short answer: a mainstream AI voice agent stack costs about 9 to 15 cents a minute all in. A business taking 300 calls a month at three minutes each runs roughly $89.
The number that actually matters: at a 50% booking rate that is about 65 cents per booked appointment, against roughly $14 for a live answering service. Minutes are not what you buy. Booked jobs are.
Every cost guide in this category quotes the same four answering-service prices. We traced them: they come from one blog post, and two of the four are now wrong against the vendors’ own live pages.
So we opened all of them ourselves in August 2026. Here is what they actually say, and what the arithmetic really looks like.
The four layers you pay for
Every voice agent, whoever builds it, is assembled the same way. Each layer bills separately, which is how a platform advertising five cents a minute produces an invoice three times that.
| Layer | Published rate |
|---|---|
| Telephony — carries the call | Twilio: $0.0085/min inbound, $1.15/mo per US local number |
| Platform — holds the call open, manages interruptions | Vapi: $0.05/min, 10 concurrent lines included, then $10/line/month |
| Transcription — speech to text | Deepgram Nova-3: $0.0048/min. Cheaper and pricier options either side |
| Language model — decides what to say and do | Roughly $0.002–$0.02/min depending on the model |
| Voice — text back to speech | Deepgram Aura-2: $0.015–$0.021/min. ElevenLabs v3: $0.05–$0.07/min |
The voice is the line that moves. A standard synthetic voice and a mid-tier model land the three AI layers at 2 to 5 cents a minute combined. Swap in a premium cloned voice and a frontier model and the same three layers reach 8 or 9 cents. That single choice roughly triples the AI portion of your bill, which is why anyone quoting a flat per-minute number without asking what voice you want is guessing.
Plenty of guides put the combined AI layers at 5 to 15 cents a minute. Against published rates in August 2026 that is too high at both ends. A budget stack runs closer to a penny and a half; a premium one reaches about nine cents. You only exceed that with a speech-to-speech realtime architecture, which is a different design, not a different price.
A worked month: 300 calls
A home-services company taking three hundred inbound calls a month, averaging three minutes — 900 billable minutes, on a mainstream stack.
| Phone number | $1.15 |
| Inbound minutes — 900 × $0.0085 | $7.65 |
| Media streaming — 900 × ~$0.004 | $3.60 |
| Platform hosting — 900 × $0.05 | $45.00 |
| Transcription, model and voice — 900 × ~$0.035 | $31.50 |
| Monthly running cost | ~$89 ($0.099/min) |
Three hundred calls a month will not exceed ten concurrent lines, so no extra concurrency fee applies. A busier operation would add $10 per line per month beyond the tenth.
Choose a premium voice and a larger model and the same month reaches about $130. Run a lean stack and it drops near $65.
What live answering services actually charge, checked in August 2026
This is the part everyone copies from everyone else. We opened each vendor’s own pricing page.
| Vendor | Entry plan | Effective rate |
|---|---|---|
| Ruby | $250/mo, 50 minutes | $5.00/min |
| AbbyConnect | $329/mo, 100 minutes | $3.29/min |
| Moneypenny | $165/mo, 50 minutes | $3.30/min, then $2.28 overage |
| Smith.ai | $285/mo, 30 calls | $9.50/call, then $10.50 |
| PATLive | Overage $2.00–$2.60/min | — |
If you have read that live answering runs $0.75 to $1.50 a minute, or from $1 a call — no US vendor publishes anything close. Those figures circulate widely and none of them survive contact with an actual pricing page. Real overage rates sit around $1.65 to $2.60 a minute, and entry plans work out at $3.30 to $5.00 a minute because the included allowance is so small.
The comparison nobody publishes: cost per booked job
Per-minute pricing is the wrong unit. No plumber has ever wanted a minute. They want a job on the calendar.
So divide by bookings instead. Take the same 300 calls, and assume half of them end in a booked appointment — plug in your own rate if you know it, because this is the one number here that comes from your business rather than a price list.
| Monthly cost | Per booked job | |
|---|---|---|
| AI agent, mainstream stack | ~$89 | ~$0.59 |
| Live answering at $7/call | ~$2,100 | ~$14.00 |
Against an average repair ticket, either number is small. That is the real point. The argument for an AI agent was never that it is cheap — it is that the calls currently reaching nobody cost you the whole ticket, and both options beat that comfortably.
Which means the question worth asking is not “what does it cost per minute.” It is “how many calls am I missing, and what is one of them worth?”
Want this run against your own call log?
We will use your real call volume and booking rate rather than an average — and tell you if the answer is no. See how we build these on our AI voice agent development page, or start with an AI opportunity audit.
The costs that don’t appear on any pricing page
When a caller talks over the agent, the audio already generated is thrown away — and still billed. On a natural conversation this wastes a meaningful slice of your voice spend.
Every turn resends the conversation so far. A twenty-minute call costs disproportionately more per minute than a three-minute one, because the model is rereading everything each time.
Handing a call to a human opens a second leg on a second meter. A high transfer rate quietly changes the whole calculation, which is why the escalation rate matters as much as the per-minute rate.
They open a call and bill a minute like anyone else. Budget five to ten percent above your useful minutes.
Writing the call logic, loading your services and prices, connecting the calendar and CRM, and testing against real calls is a one-time cost and usually the largest first invoice. Then prices change, staff change, a service launches — and an agent working from stale information is worse than voicemail.
Where to go next
If the numbers work, the practical setups are inbound call answering for the calls themselves and an appointment booking agent if the goal is a filled calendar rather than a message taken.
If you are not certain a phone agent is the right tool at all, start with the comparison against chatbots and live answering services. A fair number of businesses find their enquiries arrive typed rather than spoken, and buy the wrong thing because nobody asked.
Frequently Asked Questions
How much does an AI voice agent cost per minute?
About $0.09 to $0.15 a minute all in on a mainstream stack. That is telephony (Twilio at $0.0085/min inbound plus roughly $0.004 for media streaming), the voice platform (Vapi at $0.05/min), and the AI layers — transcription, language model and synthetic voice — which together run about $0.02 to $0.05 a minute. A premium voice pushes the total nearer $0.15; a lean stack lands under $0.08.
What do live answering services actually charge in 2026?
Checked against vendor pricing pages in August 2026: Ruby $250/month for 50 minutes, AbbyConnect $329 for 100 minutes, Moneypenny from $165 for 50 minutes with $2.28/min overage, Smith.ai $285/month for 30 calls then $10.50 each, PATLive overage $2.00-$2.60/min. Widely repeated figures of $0.75-$1.50 a minute or $1 a call do not match any US vendor’s published pricing.
What does an AI receptionist cost per booked appointment?
At 300 calls a month, a mainstream stack costs about $89, and if half those calls end in a booking that is roughly $0.59 per booked job. A live answering service at around $7 a call works out near $14 per booking on the same assumptions. Per booked job is the more useful comparison, because minutes are not the thing a business is actually buying.
What costs are hidden in AI voice agent pricing?
Five: audio generated then discarded when a caller interrupts, which is still billed; conversation context that grows each turn so long calls cost more per minute; transfers to a human that open a second billable leg; wrong numbers and robocalls that bill like real calls; and the one-time build plus ongoing maintenance when prices, staff or services change.
Is an AI voice agent cheaper than a live answering service?
On running costs, by a wide margin — roughly $89 a month versus about $2,100 for the same 300 calls at live rates. The AI agent carries a one-time build cost that a live service does not, and a human still handles the difficult calls better, which is why most setups route emotionally loaded or sensitive calls to a person.