Blog · April 5, 2026
How Much Does an AI Phone Agent Actually Cost in 2026?
The range is wider than you'd think. Here's what you actually get at each price point, and why the cheapest option usually isn't.
AI phone agents have gone from experimental to practical in about two years. Prices have come down. But the real cost is often buried in what's not included: setup fees, developer time, per-minute charges that add up, and integrations you have to build yourself.
This breaks down the full picture so you know what you're actually buying.
The Two Categories
AI phone agent products fall into two camps: DIY platforms where you build the agent yourself, and managed services where someone builds and runs it for you.
If you're a developer or have one on staff, DIY can work out cheaper. If you're a contractor who just wants calls answered, you want managed. Trying to configure Bland AI yourself while running a plumbing business is not a good use of your time.
DIY Platforms: What They Cost
These are the tools you use to build your own AI phone agent. Low sticker price, real time investment.
Bland AI
$0.09/minOne of the more popular developer-facing platforms. Pay per minute, no monthly minimum. You build the agent via API and manage everything yourself.
Real cost at 100 calls/month: $90-250 in usage, plus developer time to build and maintain the integration. No booking logic included.
Retell AI
$0.10-0.15/minSimilar to Bland, slightly higher quality voice. Has a low-code builder that's more accessible than raw API. Still requires real configuration work.
Real cost at 100 calls/month: $100-300, plus time. Calendar booking requires custom code or a Zapier-style workaround.
Vapi
$0.05-0.20/minMore infrastructure-level tool. Flexible and powerful, but you're expected to wire it all together. Popular with dev agencies building for multiple clients.
Real cost at 100 calls/month: $50-200 in usage plus developer time. Not built for end users.
The common thread with DIY: the per-minute rate looks low, but you're paying for the platform, not the solution. You still need to build the intake flow, handle calendar integration, write the scripts, test edge cases, and maintain it when things break. That takes real hours.
Managed Services: What They Cost
These are done-for-you services. You pay more per month, but someone else builds the agent, trains it on your business, and keeps it running.
Smith.ai
$285 - $2,500+/moHybrid human and AI service. Good for businesses that need nuanced intake. The AI handles volume, humans handle escalations. Strong integrations with CRMs like HubSpot and Salesforce.
Who it's for: Law firms, agencies, larger service businesses. Pricing scales steeply with call volume. Can get expensive fast for contractors with high inbound volume.
Numa
~$199 - $599/moFocused on missed call text-back. When someone calls and you don't answer, Numa sends them a text automatically. Less full-featured than a true AI receptionist.
Who it's for: Businesses that want a simpler entry point. Good at text follow-up, weaker at actual call handling.
Proteus AI
$497/mo flatBuilt specifically for trades contractors: HVAC, plumbing, electrical, roofing. We configure the agent for your business, handle the integration, and manage it ongoing. Flat monthly fee, no per-minute charges.
What's included: Setup, training on your services and pricing, calendar booking, emergency escalation, text summaries after every call. If it doesn't book a job from a call you would have missed in the first 30 days, the first month is free.
The Real Cost Comparison
Let's say you're a 4-person HVAC company getting 80-100 calls per month. Maybe 60% of those are new job inquiries or existing customer calls that need scheduling.
| Option | Monthly Cost | Setup Time | Books Jobs |
|---|---|---|---|
| Bland AI (DIY) | $100-200 + dev time | 40-80 hours | Only if you build it |
| Retell AI (DIY) | $120-300 + dev time | 20-40 hours | Only if you build it |
| Smith.ai | $500-1,500 | 1-2 weeks setup | Yes |
| Numa | $199-599 | 1-3 days | Text follow-up only |
| Proteus AI | $497 flat | 48 hours | Yes, automatically |
Prices as of April 2026. DIY estimates include amortized developer time at $75/hour.
What Actually Drives the Cost
The three things that determine what you'll actually pay are: call volume, how complex your intake needs to be, and whether you want someone else to manage it.
Simple intake, moderate volume, someone else manages it: expect $300-600/month. That's the range where most contractors land with a managed service.
Complex intake, high volume, or enterprise needs: $1,000-2,500/month. Smith.ai and similar services make sense there.
One Number Worth Knowing
The average job value for a trades contractor runs $250 to $1,200 depending on trade and job type. If an AI phone agent catches one job per month that would have gone to voicemail, it has paid for itself. Most clients see 3-8 recovered calls in the first month.
The question isn't really what the agent costs. It's what each missed call costs.
Proteus AI: $497/Month, No Per-Minute Fees
Custom AI agent built for your trade, calendar booking included, live in 48 hours. If it doesn't book a job from a call you would have missed in 30 days, your first month is free.