AI Voice Agent Cost per Minute: One Month Priced Five Ways

Once converted, AI voice agents cost about $0.09 to $0.60 a minute all-in for a typical small-business month. Builder platforms such as Retell, Vapi and Bland come to $0.09 to $0.15 before build time, per-caller, credit and flat plans to $0.11 to $0.35, and per-call plans such as Smith.ai's about $0.60 on three-minute calls.

Those figures come from one month: 400 calls, three minutes each, about 300 different callers, 1,200 minutes. Each vendor counts something different, so the same month produces bills that differ by a factor of six. Worked through below, with every sum shown, and prices read from vendors' own pages in November 2026. Swap your own numbers in before you decide.

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The month all five pricing models are applied to

Say a pet shop with a grooming salon takes 400 calls a month. The calls are a mix of "are you open", "can I book Saturday for the dog" and "is my order ready". They average three minutes. Some customers ring twice, so 300 different phone numbers made the 400 calls. Three numbers, then: 400 calls, 1,200 minutes, 300 unique callers.

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The conversion that matters is the all-in cost per minute: the whole month's bill divided by 1,200. A plan that looks like $149 might be $0.12 a minute or $0.25 depending on whether the allowance covers your month. I will give that figure for each tool, and the cost per call as well, since some owners think in calls.

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Model one: per minute, assembled from parts

Builder platforms charge for each ingredient of a call by the minute. You choose the pieces and you configure the agent.

Retell. Pay-as-you-go pricing is $0.07 to $0.31 a minute depending on choices. A mid-range build: voice infrastructure $0.055, a voice from Retell's own set $0.015, a standard-tier language model at $0.064, and telephony $0.015. That adds to $0.149 a minute. For 1,200 minutes, $178.80, plus a phone number at $2 a month, so $180.80. At the cheapest listed combination ($0.07) the month would be $84; at the dearest ($0.31) it would be $372. It includes 20 concurrent calls. A knowledge base, which most shop agents need, adds $0.005 a minute, or $6 on this month.

Vapi. A hosting fee of $0.05 a minute, then separate provider charges passed through at cost: speech recognition about $0.0099, the language model $0.0077 to $0.0452, the voice $0.0146 to $0.0238, and the phone line (a Twilio local number receives calls at $0.0085 a minute plus $1.15 a month). For 1,200 minutes the parts are $60 hosting, $11.88 recognition, $9.24 to $54.24 for the model, $17.52 to $28.56 for the voice and $11.35 for the phone line. Total: roughly $110 to $166, or $0.09 to $0.14 a minute. Vapi's own estimator for 1,000 minutes gives $82 to $129.

Bland. Its Start plan charges $0.14 a minute for talk time with the language model, speech and voice included, and $0.05 a minute for transfers. For 1,200 minutes that is $168 with no platform fee, plus telephony. The Build plan is $0.12 a minute but adds $299 a month, which is not worth it until volume passes about 15,000 minutes a month. Bland's page puts typical production stacks at $0.13 to $0.30 a minute on Vapi and $0.11 to $0.25 on Retell; that is a competitor's estimate, and it sits at or above the sums here because it assumes a leading model and a premium voice.

One more tool to note: Synthflow publishes no per-minute rate or free plan; its page describes an annual enterprise agreement with no trial, aimed at mid-market and enterprise teams, so it is left out of this comparison.

Model two: per call, whatever the length

Smith.ai's AI receptionist charges for each answered call. Its Pro plan has tiers of 75, 150 and 300 calls at $150, $270 and $500, with overage of $2.50, $2.30 and $2.17 a call. For 400 calls: the 300-call tier at $500 plus 100 calls at $2.17 is $717. That is $1.79 a call and $0.60 a minute. Its free plan, 25 calls then $3 each, would be $1,125, so Pro wins here.

Per-call pricing hides the minute entirely. A one-minute wrong number costs the same as a ten-minute booking call, so it is cheap for long calls and costly for short ones. It also includes things the minute-based tools do not: Smith.ai's Pro plan has an account manager and onboarding. Part of that $717 is service, not minutes.

Model three: per unique caller

Goodcall bills by the number of different customers who call in a month. Starter is $79 for 100 unique customers, Growth is $129 for 500, Scale $299 for 2,000, with overage of 79 cents, 26 cents and 15 cents a customer. There are no per-minute or per-call charges. For 300 unique callers, Starter plus 200 extras would be $79 + $158 = $237, so Growth at $129 is cheaper. That makes it $0.32 a call and $0.11 a minute.

This is the cheapest convertible price in the comparison, and it depends on a quirk: repeat callers are free. The 100 repeat calls cost nothing extra. If every caller were new, it would be 400 unique customers and still $129 on Growth, since the 500 tier covers it. The model breaks the other way: a firm whose callers are all new and who exceeds 500 faces overage at 26 cents each.

Model four: credits

A credit is a vendor's own currency, and the conversion is where your attention should go.

Quo Sona. One call uses 100 credits, and the tiers are $0 for 10 calls, $25 for 40, $49 for 100, $99 for 250 and $199 for 600, with overage of $1.00 down to $0.45. For 400 calls: the $99 tier plus 150 calls at $0.55 is $181.50, against $199 for the 600-call tier. So $181.50, plus a seat at $19 (Starter, monthly), which is $200.50. That is $0.50 a call and $0.17 a minute. Call length does not change it.

My AI Front Desk. A $99 plan includes 200 voice minutes and a monthly pool of 1,000 credits, with each extra voice minute costing 25 credits and auto-reload at $10 per 1,000 credits. For 1,200 minutes: 1,000 minutes over, less 40 covered by the pool, leaves 960 minutes x 25 = 24,000 credits, which is 24 reloads, $240. The month is $339, or $0.28 a minute. Annual billing lowers the base to $79. It also includes chat, texts and a CRM, so part of the price buys things the other tools do not sell.

The point about credits: the same month is $200.50 in one tool and $339 in another, though both say "credits". The first charges per call, the second per minute. Always ask what one credit buys on your most common call.

Model five: flat tiers with a minute allowance

Rosie sells $49 for 250 minutes, $149 for 1,000 and $299 for 2,000. Our 1,200 minutes exceeds the $149 plan, and Rosie's page does not state an overage rate, so the safe choice is Growth at $299: $0.25 a minute with 800 minutes unused. Dialzara's plans are $29 (60 minutes), $99 (220), $199 (500) and $349 (1,000), with overage of $0.48, $0.45, $0.40 and $0.35 a minute. The cheapest route for 1,200 minutes is the $349 plan plus 200 minutes at $0.35, which is $419, or $0.35 a minute.

Flat tiers feel predictable until you cross a tier edge. Dialzara's $349 plan stops at 1,000 minutes, and the next 200 cost $70; Rosie jumps from $149 to $299 at 1,000 minutes. Look at your busiest month, not the average, and check where it lands.

All of it on one table

Two cautions on reading the table. The platform rows (Vapi, Bland, Retell) exclude your time: someone writes the agent's instructions, connects it to a calendar, tests it and watches it. If that is 20 hours at $100 an hour, it is $2,000 up front, which is more than a year of the whole Goodcall bill ($1,548). And the finished-product rows include setup, support and often features such as calendar sync or transfers that you would have to build.

For a plain comparison of the finished receptionist products on a smaller month, there is the tutorial on six Smith.ai alternatives priced for 100 calls, which goes into what each plan includes.

What happens when the calls change shape

The ranking is fragile. Keep the 400 calls and 300 callers, and change only the length.

On one-minute calls Retell is under half of Goodcall's price. On six-minute calls it costs nearly three times as much. Per-caller and per-call tools do not care about length, so they win when calls are long. A takeaway or a dental front desk, where most calls are short, suits per-minute pricing; a legal or home-service line, where calls run long and detailed, suits per-caller or per-call pricing.

The tutorial on setup and running cost for a voice agent trained on your business covers the build side that sits behind the platform rows.

Charges that never appear in a per-minute headline

• Transfers. Bland bills transfer time at $0.05 a minute on Start. A call handed to a person may bill twice: once to the agent, once on your own line.
• Phone numbers. Retell numbers are $2 a month; Bland's Start plan includes an inbound number valued at $15 a month. Several numbers multiply.
• Concurrency. Vapi's starter package allows 4 concurrent calls; extra lines cost $10 each a month. Retell includes 20 and charges $8 per extra. A busy Monday morning can need more lines than your average suggests.
• Auto top-ups. Auto-reloads, such as the one on My AI Front Desk, spend money for you at a threshold. Know the threshold and set an alert.
• Knowledge bases. Retell includes 10 knowledge bases free, then charges $8 a month for each extra one, plus $0.005 a minute on calls that use one.
• Seats. Quo needs a seat to attach Sona to. A finished receptionist rarely has seats; a phone system always does.

Convert your own month in ten minutes

Export last month's call log. Count answered calls, total minutes, and different numbers. Then ask an AI assistant to build the conversion table, giving it the vendor rules rather than letting it recall them.

I need a monthly cost comparison for an AI voice agent. My month: 400 calls, 1,200 minutes, 300 unique callers.

Use only these rules and show every sum:
A. Per-minute stack: $0.149 per minute plus $2 per month for a number.
B. Per call: $500 covers 300 calls, then $2.17 per extra call.
C. Per unique caller: $79 covers 100, $129 covers 500, $299 covers 2,000; extras 79 cents above Starter, 26 cents above Growth.
D. Credits: 100 credits per call; tiers $49 per 100 calls, $99 per 250 calls, $199 per 600; extras $0.55 above the 250 tier.
E. Flat: $149 covers 1,000 minutes, $299 covers 2,000 minutes.

For each, give the cheapest way to buy 400 calls, the cost per call, the cost per minute, and what happens if my minutes double. Do not guess any rate I have not given.

The reply should be a table close to the one above. If it is not, find the row that differs and check the rule you gave. Models make arithmetic slips; recheck the largest figure by hand, or paste the same rules into a spreadsheet with a formula for each row. For the spreadsheet route, divide the total in one cell by the minutes in another, and copy the formula down.

A cheap rate that turned into a dear month

An illustrative case. A pet shop picks a platform on a headline of $0.07 a minute, builds a simple agent, expects about 1,200 minutes, and budgets under $100. The first month lands at $214. Three things explain it. The cheapest voice and model are not what the agent uses, because the owner chose a more natural voice; the real rate is $0.15. Two weeks of testing calls and a stuck call that ran for 40 minutes added 180 minutes, so 1,380 minutes at $0.15 came to $207. And about 140 minutes of transfers to staff were billed at a separate $0.05 transfer rate, another $7.

The fix is a one-page cost sheet written before launch: the real per-minute rate from a test month, a spend cap or alert at 120% of expected, a maximum call length so a stuck call ends itself, and a weekly look at the usage page during the first month. Finished products do not remove the need for the weekly look, but they do remove the stuck-call risk, which is the one to watch on a platform.

Four shops, four call patterns

The right model depends less on the vendor than on how your calls are shaped. Four short sketches, all illustrative.

An optician. Most calls are two minutes: opening hours, whether glasses are ready, booking an eye test. Short and many, so a per-minute platform is cheap, and a per-call tool is poor value. The risk is the occasional long call from someone confused about an insurance claim, which a maximum call length can cap.

A garden centre. Seasonal swings: 150 calls in January, 700 in May. Flat tiers punish the peak, and a per-unique-caller tier can jump a band. The safest check is to price the busiest month, then ask each vendor what happens if you cross a band partway through. Month-to-month terms matter more than the lowest price.

A pet shop with grooming. The case worked above: medium calls, many repeats, bookings. Per-caller and credit-per-call plans suit it, because the repeats are free or cheap and the three-minute booking call is the main event.

A gift shop. Few calls, long and chatty, particularly before holidays: "what could I get for a hundred-dollar budget?" At 60 calls of six minutes (360 minutes) a per-call plan at $2 or more a call costs around $120 to $150, while a per-minute platform at $0.15 is $54. Here the minute-based tool wins, so the same tools reverse position depending on the firm.

Keeping the bill from drifting

Whatever you pick, put a monthly review in the diary for the first three months. Open the vendor's usage page, copy the minutes, calls and unique callers into a small sheet, and compare them with the sums above. If the real bill is more than 15% over, find which of the three numbers moved. A change in average call length is the usual cause, and it is fixed by tightening the agent's instructions so it stops explaining things nobody asked about.

Set the alert before launch, not after the first surprise. Most platforms allow a spending limit or a low-balance warning; where there is none, a calendar reminder to check the usage page every Friday will do. A bill that doubles in a week is nearly always a stuck call, a loop between two automated systems, or a campaign of test calls someone forgot to stop.

Choosing among them

Short calls, simple questions, and someone to build and watch it: a per-minute platform. Long or varied calls, and nobody to build: Goodcall's per-caller plan or a call-based plan. A phone system you want anyway: Quo. Chat, texts and calls from one vendor: My AI Front Desk. A person's service and onboarding: Smith.ai, for its price. For the contract points to negotiate with whichever you choose, see minutes, data and exit terms to negotiate, and run the calls in a 15-call test before it takes real jobs. If you would rather price your own month with someone, that is what my AI implementation consultation covers.

Questions about voice agent pricing

Why do advertised per-minute prices look so low?

Many advertise only the platform fee. The speech recognition, the language model, the voice and the phone line are separate meters, and together they often come to two or three times the headline rate. Always add the components before comparing a platform to a finished receptionist product.

Which pricing model is safest for a business with long calls?

Per unique caller or a flat plan with a large minute allowance. Per-minute and per-credit models grow with call length, while a unique-caller plan such as Goodcall's charges the same for a two-minute call or a ten-minute one. Per-call pricing also ignores length, but its fixed price per call is higher.

How do I turn a monthly plan price into a cost per minute?

Divide the total monthly cost by the minutes you actually use, not the minutes the plan includes. A $299 plan with 2,000 included minutes costs $0.15 a minute if you use all of them, but $0.25 a minute if you use 1,200. Use last month's real minutes from your phone log.

Do voice agent platforms charge for calls that do not connect?

Some bill from the moment the agent picks up, including transfers and silent calls, and some charge a separate transfer rate. Bland lists transfer time at $0.05 a minute on its Start plan, for example. Ask how a ringing call, a voicemail and a transferred call are metered.

Is a builder platform or a finished receptionist better for a small firm?

A finished receptionist product for most. Platforms such as Retell, Vapi and Bland are cheaper per minute but you build, test and maintain the agent yourself or pay someone to. Choose a platform when you need custom logic or integrations that the finished products cannot do.

Further reads

• AI Voice Agent for Contractors: What It Handles and What It Hands Off — What a voice agent should handle and what it passes on.
• Can an AI Voice Agent Book Car Dealership Service Appointments? — Booking calls handled by a voice agent, step by step.
• Restaurant AI Voice Agent: 12 Test Calls to Run Before Go-Live — A test-call script you can reuse for any voice agent.
• Logistics AI Voice Agent: Setup, Call Flows and Monthly Cost — Call flows and monthly cost for status calls.
• How Much Does an AI Receptionist Cost for a Small Business? — The wider cost picture for an AI receptionist.
• AI Phone Answering for Restaurants: What It Costs and Pays Back — Cost and payback for a restaurant phone line.
• AI Voice Agent for a Hotel Front Desk: Calls to Hand Over and Keep — A call-type table, night transfer rules for three kinds of hotel and 14 test calls to run before an AI voice agent answers a real guest.
• AI Voice Agent for Ecommerce: Cost per Order-Status Call — Cost per order-status call from listed per-minute prices, set against a part-time hire, with lookup limits and handover rules.
• Aircall Pricing per Minute: AI Voice Agent Rates, Bundles, Limits — What Aircall's AI Voice Agent really costs at 200, 500 and 2,500 minutes a month, and where a bundle starts to beat pay as you go.
• AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.

Sources: the pricing pages of Retell, Vapi, Bland, Smith.ai, Goodcall, Quo, Rosie, Dialzara and My AI Front Desk, read in November 2026; the call volume, call length and caller counts are illustrative assumptions.