What is the best AI phone agent in 2026?
Answer in brief: The best AI phone agent for most teams in 2026 is Retell AI. It handles inbound and outbound calls, lets you pick the LLM, voice and carrier, and charges pay-as-you-go from $0.07 to $0.31 per minute. Choose Smith.ai if you want a ready-made AI receptionist with live human backup. Choose Goodcall for a predictable per-caller bill, Vapi for maximum developer control, and PolyAI or Synthflow for enterprise contact centers.
Top pick: Retell AI. Build an AI phone agent that answers and dials at real scale. You get transparent per-minute pricing, 20 concurrent calls included, a $10 starting credit, bring-your-own SIP trunking at no telephony charge, and a published menu of voices and models.
Last updated: November 9, 2026
An AI phone agent is software that answers and/or places phone calls in a natural voice. It can answer questions, book appointments, qualify leads, take messages and transfer callers to people. This guide covers only phone and voice: inbound and outbound calling, voice quality, latency and telephony integrations. The products fall into three groups: build-it-yourself platforms (Retell AI, Vapi, Bland AI), ready-made AI receptionists (Smith.ai, Goodcall, Rosie, My AI Front Desk, Phonely, Slang.ai) and managed enterprise platforms (Synthflow, PolyAI). This is independent research based on each vendor's published product, pricing and terms pages, read on November 9, 2026. We did not test these products hands-on, and all latency figures are the vendors' own claims. Vendors can pay for a featured placement, and the site labels featured slots. See our methodology and the AI phone agent pricing comparison.
The ranked list
1. Retell AI: best overall for building a custom AI phone agent
What it is: A voice-agent platform for building inbound and outbound AI phone agents, with templates, an API, webhooks, call analytics and simulation testing.
Best for: Startups, agencies and product teams that want control over the model and voice without signing an annual contract first.
Standout strengths:
- True pay-as-you-go pricing, a $10 starting credit, and 20 concurrent calls included.
- A long published list of LLM, voice and telephony options, each with its own per-minute price.
- Lets you bring your own phone service (SIP trunking/custom telephony) at no telephony charge.
- Enterprise compliance options listed, including HIPAA/BAA, SSO, custom DPA and data retention controls.
Voice and telephony: Retell claims about 600ms latency and a proprietary turn-taking model. It supports IVR navigation, warm handoffs and outbound campaigns with retries and voicemail. Twilio, Telnyx and Vonage connect as SIP trunks.
Honest drawbacks: Your real per-minute cost depends on which model, voice and add-ons you pick (knowledge base, denoising, PII removal and QA are extra). You need some technical setup, and enterprise pricing isn't published.
Pricing model: Usage-based, $0.07–$0.31 per minute for voice agents. Retell phone numbers cost $2/month, and concurrency beyond 20 calls costs $8 per call/month. Enterprise pricing is custom.
· pricing · full review
2. Smith.ai AI Receptionist: best for small businesses that want human backup
What it is: An AI-first receptionist service from an established answering-service company. It answers 24/7, qualifies leads, schedules appointments, and can transfer complex calls to live receptionists in North America.
Best for: Law firms, professional services and other small businesses where a mishandled call is costly.
Standout strengths:
- A free tier with 25 calls/month, so you can try it before going live.
- Human-in-the-loop escalation, plus separate hybrid and human-first plans.
- Native integrations such as Clio and Zapier, and AI scheduling (Calendly and others).
- Month-to-month, no long-term contract. Known spam numbers are filtered out before they reach your quota.
Voice and telephony: Answers in English and Spanish with voice customization. It offers warm transfers, and you can rehearse with 50 simulated calls a month in Quality Studio.
Honest drawbacks: Billing is per call, so a lot of short calls gets expensive. Smith.ai itself says it is a bit pricier than the competition. Custom prompting and integrations are only on Enterprise.
Pricing model: Per call. Free has 25 calls, then $3.00 per call. Pro is $150/month for 75 calls ($2.00/call). Enterprise starts at $500/month for 300 calls ($1.67/call).
· pricing · full review
3. Goodcall: best for predictable small-business pricing
What it is: An AI phone agent for local and service businesses that books work, takes messages and answers questions. You configure it in plain English through its built-in assistant, Gabi.
Best for: Solo operators, trades and multi-location shops whose calls vary a lot in length.
Standout strengths:
- Bills per unique caller per month, with no charge for minutes, calls or tokens. Spam and wrong numbers aren't counted.
- Every plan includes a local number, or you can forward your existing one.
- You can build and test a free demo agent before paying.
Voice and telephony: Escalation transfers retry busy lines and try up to three contacts. You keep your number with carrier conditional forwarding. There's no self-serve porting.
Honest drawbacks: Lower tiers limit workers, external tools, team members and call history. If you have many distinct callers on Starter, the 79¢ overage adds up.
Pricing model: Per unique customer. Starter is $79/month for 100 customers, then 79¢ each. Growth is $129 for 500, then 26¢. Scale is $299 for 2,000, then 15¢. Enterprise pricing is custom.
· pricing · full review
4. Vapi: best for developers who want maximum control
What it is: A developer platform for building voice agents. You choose the transcriber, model, voice and carrier, and pay for each at the provider's cost.
Best for: Engineering teams building voice AI into their own products.
Standout strengths:
- Model costs pass through with no markup, and the agent count is unlimited.
- Built-in testing, call simulation and monitoring.
- Free Vapi telephony/SIP and WebSocket transport, plus Twilio, Vonage and Telnyx support.
Voice and telephony: Vapi's docs claim sub-600ms responses and natural turn-taking. Squads let several agents hand a call between them.
Honest drawbacks: You manage several separate costs. The free tier has only 4 concurrent calls and community support. HIPAA compliance is a $2,000/month add-on, and Pro support has a $999/month minimum.
Pricing model: A $0.05/minute hosting fee plus provider costs. Vapi's own example for 1,000 minutes comes to about $82–$129/month. Optional plans: Core $29/month, Pro 10% of hosting fees with a $999/month minimum, Premier custom.
· pricing · full review
5. Bland AI: best bundled per-minute rate for developers and regulated teams
What it is: A programmable phone-agent platform with Conversational Pathways. Its per-minute rate covers the LLM, speech recognition and voice.
Best for: Teams that want one simple usage rate, and regulated organizations that need on-premises/VPC deployment or a signed BAA.
Standout strengths:
- One rate with no token charges or model pass-through fees.
- Bring your own Twilio account or SIP trunk. Bring-your-own-telephony customers don't pay transfer fees.
- Bland says it has SOC 2 Type I/II, HIPAA with a BAA, GDPR, ISO 27001 and FedRAMP 20x Class A. Enterprise adds on-prem/VPC deployment and forward-deployed engineers.
Voice and telephony: Bland says its Speech v3 voice model delivers first audio in 199ms. It also says the model ranks as the top non-human entry on an audio realism benchmark, and that it can clone a voice from about 10 seconds of audio.
Honest drawbacks: Telephony costs extra. The free Start plan is capped at 100 calls/day and one voice. Many advanced features (warm transfers, SMS, guardrails) are reserved for higher tiers.
Pricing model: Start has no platform fee, then $0.14/minute. Build is $299/month plus $0.12/minute. Enterprise is priced by contract.
· pricing · full review
6. Rosie: best low-cost AI answering service with mobile apps
What it is: An AI answering service for small businesses. It learns from your Google business profile and website, answers 24/7, takes messages and books appointments.
Best for: Home services, trades and solo owners on a tight budget.
Standout strengths:
- Low entry price: 250 minutes for $49/month, with a 7-day free trial.
- Native iOS and Android apps, 10+ voices, English and Spanish on every call, and a Zapier integration.
- Higher tiers add warm, live and waterfall transfers.
Honest drawbacks: The $49 tier doesn't book appointments on your calendar or transfer calls (those start at $149). There's no per-minute overage. Under Rosie's Terms of Service (dated February 5, 2026), going over your minutes automatically moves you to a higher plan, and you stay on it until you downgrade. Upgrades apply to the current billing period and at least the next two. Minutes are rounded up to the next full minute.
Pricing model: 30-day subscription with included minutes. Professional is $49/month for 250 minutes, Scale is $149 for 1,000, and Growth is $299 for 2,000. Annual billing advertises two months free. Website texting is a $50/month add-on.
· pricing · full review
7. My AI Front Desk: best all-in-one AI front office
What it is: An AI receptionist bundled with web chat, two-way SMS, a built-in CRM and follow-up automations.
Best for: Small businesses, including property management and real estate, that want phone, chat and text follow-up in one product.
Standout strengths:
- One plan covers voice (200 minutes), 100 chatbot conversations, 400 SMS and 500 email drafts.
- Supports 20+ languages, includes Zapier and a verified outbound number, and offers a 7-day free trial.
Honest drawbacks: 200 minutes is a small voice allowance. Outbound calls are capped at 20/day. API access and custom work are only on Partner/Enterprise plans.
Pricing model: Business-in-a-Box is $99/month, or $79/month billed annually. Extra usage draws on a monthly pool of 1,000 overage credits (voice overage is 25 credits, or $0.25, per minute), and additional credits cost $10 per 1,000.
· pricing · full review
8. Phonely: best budget option with inbound and outbound calling
What it is: An AI phone agent for inbound and outbound calls, with premium voices, call transcripts and analytics, spam filtering, and CRM/API integrations on higher plans.
Best for: Small teams that want low-cost answering, plus enterprises that want a fully built agent.
Standout strengths:
- A low starting price of $50/month, or $33/month billed annually.
- Unlimited concurrent calls on every plan, and free phone numbers included (3 on Starter, 5 on Pro).
- Alma, Phonely's voice-native model, which Phonely says reaches first token in 182ms in its own test. Enterprise rates start at 5¢/minute and include a HIPAA BAA.
Honest drawbacks: The pricing page contradicts itself on included minutes. The plan cards say 200 (Starter) and 650 (Pro), but the comparison table says 250 and 750. The table lists overage at $0.35/min for Starter, $0.30 for Pro and $0.25 for Enterprise. Confirm on your order form before you buy. Post-transfer minutes can be billed at $0.02/min.
Pricing model: Starter is $50/month and Pro $150/month (annual: $33 and $100 per month), plus per-minute overage. Enterprise from 5¢/minute.
· pricing · full review
9. Synthflow: best managed platform for mid-market and enterprise rollouts
What it is: An enterprise voice-agent platform. Each contract covers telephony, integrations, security review and, where included, launch support from forward-deployed engineers.
Best for: Mid-market and enterprise companies, BPOs and software platforms (white-label is available) that want a managed rollout.
Standout strengths:
- Synthflow says it handles 1M+ calls daily in 30+ countries. Batteries Plus runs Synthflow agents inside Zoom Phone across 700+ U.S. locations.
- Built-in connections to Zoom, Five9, RingCentral, 8x8, Twilio, Telnyx and Vonage. Synthflow claims replies in under 500ms.
- Its Trust Center lists SOC 2 Type 2, ISO/IEC 27001, GDPR, HIPAA and PCI DSS v4.0.1.
Honest drawbacks: No free plan, no trial and no per-minute rate. Every new deployment is an annual enterprise agreement, so it doesn't suit small businesses.
Pricing model: A custom annual enterprise contract.
· pricing · full review
10. PolyAI: best for large enterprise contact centers
What it is: An enterprise conversational AI company. It offers a managed voice-agent platform (the Agentic Dialog Platform) and a model-only API (Dialog-RSN-1) for teams with their own voice stack.
Best for: Large brands replacing or extending contact-center phone lines.
Standout strengths:
- Billed per second of connected time, with no minimums. The per-minute platform price includes ongoing improvements, maintenance and 24/7 support.
- SOC 2 and ISO 27001 certified infrastructure. Your own carrier connects over SIP at no charge. Voice, chat and messaging run on one platform.
- PolyAI says Dialog-RSN-1 reaches first token in under 300ms at the median.
Honest drawbacks: Platform pricing is only available through sales. The $0.02/minute API price leaves out telephony and orchestration, so it isn't the full cost of a phone agent.
Pricing model: Platform pricing is per minute and custom. The Dialog-RSN-1 API is $0.02 per connected minute plus text tokens ($2.00 per 1M input, $5.00 per 1M output).
· pricing · full review
11. Slang.ai: best AI phone agent for restaurants
What it is: A voice AI concierge built for restaurants. It handles reservations, special requests, private-event leads and guest questions.
Best for: Independent restaurants and multi-location hospitality groups.
Standout strengths:
- Integrates with OpenTable, SevenRooms, Yelp and Tripleseat.
- VIP handling, text confirmations, and CSAT measured on calls. The Premium plan supports 97 languages, and calls can transfer instantly to a human.
- Slang.ai says most operators go live in their first week.
Honest drawbacks: Only useful for restaurants and hospitality. No prices are published, and every plan is quote-based. Fees are invoiced monthly in advance unless your order form says otherwise.
Pricing model: Quote-based Core, Premium and Enterprise plans.
· pricing · full review
Comparison table
| Rank | Product | Type | Best for | Pricing model | Entry price (published) | Telephony | Vendor-claimed speed |
|---|---|---|---|---|---|---|---|
| 1 | Retell AI | Build-it-yourself platform | Custom agents, flexible stack | Per minute | $0.07–$0.31/min, $10 credit | BYO SIP free; Twilio/Telnyx $0.015/min | ~600ms latency |
| 2 | Smith.ai | AI receptionist + human backup | Professional services | Per call | Free (25 calls); Pro $150/mo | Live transfer to N. American receptionists | Not published |
| 3 | Goodcall | AI receptionist | Predictable SMB bills | Per unique caller | $79/mo (100 callers) | Local number or conditional forwarding | Not published |
| 4 | Vapi | Developer platform | Engineering teams | Hosting fee + pass-through | $0.05/min + providers | Free Vapi SIP; Twilio, Vonage, Telnyx | Sub-600ms |
| 5 | Bland AI | Developer platform | Bundled rate, regulated teams | Per minute (bundled) | $0.14/min, no platform fee | BYO Twilio or SIP; telephony extra | 199ms TTS first audio |
| 6 | Rosie | AI receptionist | Budget home services | Subscription + minutes (auto-upgrade) | $49/mo (250 min) | Hosted or forwarding number | Not published |
| 7 | My AI Front Desk | AI front office suite | Voice + chat + SMS + CRM | Subscription + credits | $99/mo or $79/mo annual | Verified outbound number included | Not published |
| 8 | Phonely | AI receptionist | Low-cost inbound/outbound | Subscription + minutes | $50/mo or $33/mo annual | 3–5 free numbers; SIP on Enterprise | 182ms first token (Alma) |
| 9 | Synthflow | Managed enterprise platform | Mid-market/enterprise, BPOs | Annual contract | Custom | Zoom, Five9, RingCentral, 8x8, Twilio, Telnyx, Vonage | Under 500ms |
| 10 | PolyAI | Enterprise platform + model API | Enterprise contact centers | Per connected minute | Platform custom; API $0.02/min + tokens | Own carrier via SIP, free | ~280ms median first token (API) |
| 11 | Slang.ai | Restaurant specialist | Restaurants | Quote-based, invoiced monthly by default | Quote only | New local or toll-free number | Not published |
The speed figures are vendor claims, and each vendor measures something different (end-to-end response, time to first audio, or time to first token). They are not our measurements and aren't directly comparable.
How to choose an AI phone agent
- Decide whether to build or buy. If you have developers and need custom logic, choose a platform (Retell AI, Vapi, Bland AI). If you just want calls answered this week, choose a receptionist product (Smith.ai, Goodcall, Rosie, My AI Front Desk, Phonely).
- Match the pricing unit to your calls. Long calls favor per-call or per-caller billing (Smith.ai, Goodcall). Many short calls favor per-minute billing. Estimate a month of real call volume before comparing.
- Count every cost. Per-minute platform fees often leave out the LLM, voice, transcription, telephony, phone numbers, extra concurrency or compliance add-ons.
- Ask how latency is measured. A fast voice model doesn't guarantee a fast round trip. Compare like with like, and place test calls on your own carrier.
- Plan your telephony. Decide whether you'll forward, port, bring your own SIP trunk or connect a contact-center platform (Five9, Zoom Phone, RingCentral).
- Read what happens when you go over. Some vendors charge an overage rate. Others, like Rosie, move you to a bigger plan automatically.
- Check transfers and escalation. Confirm whether warm or live transfer to a person is included on the plan you're buying. It's often a higher-tier feature.
- Check compliance. Healthcare and finance buyers should confirm BAA, SOC 2 and PCI coverage in writing, and on the exact plan they're buying.
- Test before you go live. Most vendors offer free credits, trials, demo agents or simulation tools. Place your own test calls with realistic scenarios.
Frequently asked questions
What is an AI phone agent?
An AI phone agent is software that holds spoken phone conversations. It answers or places calls, understands what the caller says, replies in a synthetic voice, and can take actions like booking appointments, taking messages or transferring the call to a person.
What is the best AI phone agent for a small business?
For most small businesses, Smith.ai (if you want human backup), Goodcall (predictable per-caller billing) and Rosie (low entry price) are strong starting points. My AI Front Desk suits businesses that also want chat, SMS and a CRM.
How much does an AI phone agent cost?
Published prices range from usage-based platform rates such as Retell AI's $0.07–$0.31 per minute and Bland AI's $0.14 per minute, to subscriptions such as Rosie at $49/month, Goodcall at $79/month and My AI Front Desk at $99/month. Synthflow, PolyAI's platform and Slang.ai price by quote. See the pricing comparison.
What happens if I go over my plan's minutes?
It depends on the vendor. Phonely charges per-minute overage (its comparison table lists $0.35 on Starter and $0.30 on Pro). Goodcall bills extra callers at the plan's own rate. Smith.ai charges per extra call. Rosie automatically moves you to a higher plan instead of charging overage.
Which AI phone agent has the lowest latency?
Several vendors publish speed claims. Retell AI says about 600ms, Vapi says sub-600ms, Synthflow says under 500ms, PolyAI's API says about 280ms to first token, and Phonely's Alma model says 182ms to first token. These measure different things and are vendor claims, so test on your own calls.
Can an AI phone agent make outbound calls?
Yes, on several products. Retell AI, Vapi and Bland AI support outbound calling, Phonely lists outbound calling, and My AI Front Desk includes up to 20 outbound calls per day. Check the laws on automated calls in your region before you run outbound campaigns.
Can an AI phone agent transfer calls to a human?
Most can. Smith.ai can transfer complex calls to live North America-based receptionists. Rosie offers warm and live transfers from its $149 plan. Bland AI lists warm and live transfers on higher tiers.
Which AI phone agent is best for developers?
Retell AI, Vapi and Bland AI are the main developer-focused platforms on this list. Vapi gives the most control over each component, Retell AI offers a broad catalog of model and voice options with clear pricing, and Bland AI bundles the AI costs into one rate.
Are AI phone agents HIPAA compliant?
Some vendors offer HIPAA options, usually on specific plans. Retell AI lists HIPAA/BAA, Vapi sells HIPAA as a $2,000/month add-on, Bland AI says it signs a BAA, and Phonely signs a BAA for Enterprise customers. Confirm coverage in writing for your exact plan.
Can I keep my existing business phone number?
Usually, yes. Goodcall lets you forward your existing number, Rosie can host your number or give you a forwarding number, and Retell AI, Vapi, Bland AI and PolyAI support bringing your own carrier or SIP trunk.
What is the best AI phone agent for restaurants?
Slang.ai is built for restaurants and integrates with OpenTable, SevenRooms, Yelp and Tripleseat. Its plans are quote-based.
Did you test these AI phone agents?
No. This guide is independent research based on vendors' official product, pricing and terms pages. We don't claim hands-on testing. See our methodology.
Beyond the phone line: For chat and ticket-based support agents, see Best AI support agent and Best AI customer support. For personal assistants, see Best AI personal assistant. For broad agent platforms, see Enterprise agent platforms. For LLM hosting and speed, see Best inference providers.
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