# AI chatbot vs voice agent for New Zealand businesses.

URL: https://levystreet.com/compare/ai-chatbot-vs-voice-agent/
Updated: 2026-10-19

AI chatbot vs voice agent for NZ businesses: per-outcome and per-minute pricing, +64 number costs, accent and place-name testing and a cost example.

## Short answer

Start with an AI chatbot when customers already write to you by web chat, email or messaging: text is easier to check, hand to staff and improve. Choose a voice agent when the phone is how customers reach you and missed calls lose work, such as after-hours trade bookings. Voice is harder to get right with New Zealand accents and place names, and needs a +64 number from a carrier.

- None of the voice platforms we reviewed sells New Zealand (+64) numbers directly.
- Twilio's NZ local number is $3.15 a month; toll-free inbound minutes cost far more.
- Chat agents are often priced per resolved conversation; voice agents per minute.
- Test voice agents on NZ accents, te reo Māori place names and street addresses.
- Twilio does not allow emergency calls over its NZ numbers.

## How do AI chatbots and voice agents compare?

Both answer customers, look things up and hand over to staff. They differ in the channel, how they are billed, and what goes wrong.

| As listed on 19 October 2026 | AI chatbot | AI voice agent |
|---|---|---|
| Channel | Website chat, email, messaging apps | Phone calls |
| Suits | Order status, FAQs, quote requests, booking changes | After-hours bookings, call overflow, simple enquiries from callers who prefer to talk |
| Typical pricing | Per resolved conversation, or model tokens if you build | Per minute of call time, plus carrier charges |
| Example prices | Intercom Fin US$0.99 per outcome; HubSpot customer agent 50 credits (US$0.50) per resolution | Vapi US$0.05 a minute hosting plus components; Retell US$0.07 to US$0.31 a minute; OpenAI GPT-Live-1 US$0.05 a minute plus backend model |
| NZ phone number | Not needed | Bring your own: Twilio NZ local $3.15 a month, toll-free $40 a month |
| Hardest quality problem | Confident wrong answers in writing | Mishearing names, addresses and numbers; latency; interruptions |
| Checking quality | Read transcripts; easy to sample | Listen to or read call transcripts; slower to review |
| Handover | Pass the transcript to a staff member | Warm transfer to a person, or a call-back with a summary |

## Where is each one stronger?

**A chatbot** is easier to get right. Customers can paste an order number, staff can read every conversation in seconds, and a wrong answer is visible in writing for correction. It also builds on what you already have: our lesson on [building customer FAQs from support tickets](/learn/building-customer-faqs-from-support-tickets/) produces most of a chatbot's knowledge.

**A voice agent** reaches customers who will not type. For a plumber, electrician or restaurant, a missed call after hours is often a lost job or booking. A voice agent can answer every call, take the details and book the slot. See our [AI voice agents](/services/ai-voice-agents/) page for what one can and cannot handle.

## How do you test a chatbot and a voice agent on the same task?

Script 30 conversations for each task and run them through both. Use real staff, with a mix of accents, and make a few of the voice calls from a noisy car or site.


1. **After-hours booking.** The customer gives a name, a street address with a unit number such as 14A, a suburb such as Paraparaumu, Whakatāne or Ōtaki, a job description and a preferred time. Count how often the suburb, street number and phone number are captured exactly.
2. **Order or job status.** The customer gives an order or job number and asks when it will arrive. Check that the agent looks up the right record and refuses politely when the number does not match.
3. **Complaint and handover.** An unhappy customer wants a person. Time how long the agent takes to hand over, and judge the summary the staff member receives.


Our engineering guide to [voice agent quality evaluation](/engineering/voice-agent-quality-evaluation/) covers latency, interruption and transcription tests in more depth.

## What does each cost to run?

Worked example: 1,000 customer conversations a month. Assumptions: voice calls average three minutes; prices are vendor list prices on 19 October 2026 in US dollars, with Twilio's NZ page showing "$" without a currency label.

**Voice agent on Vapi with a Twilio NZ local number:**

- Vapi's own [calculator estimate](https://vapi.ai/pricing) is US$82 to US$129 per 1,000 minutes, so 3,000 minutes is about US$246 to US$387.
- Twilio's [NZ inbound local rate](https://www.twilio.com/en-us/voice/pricing/nz) is $0.0100 a minute: 3,000 × 0.0100 = $30, plus $3.15 for the number.
- Total: about US$279 to US$420 a month, or US$0.28 to US$0.42 a call.
- If callers ring an 0800 number instead, Twilio's toll-free inbound rate of $0.2556 a minute adds 3,000 × 0.2556 = $766.80 a month, plus $40 for the number. Check your carrier's rates before choosing a toll-free line.

**Chatbot:**

- **Packaged, per outcome:** if 600 of the 1,000 conversations are resolved by Intercom's Fin at US$0.99 each, that is US$594 a month. Intercom counts an [assumed resolution](https://www.intercom.com/help/en/articles/8205718-fin-ai-agent-outcomes), where the customer leaves without asking for more help, as billable.
- **Built on model APIs:** assume eight turns per conversation at 3,000 input and 200 output tokens each on Claude Sonnet 5.5 (US$2 and US$10 per million). Each turn is US$0.008, each conversation US$0.064, so US$64 a month in model fees, plus build, hosting and maintenance.

So per conversation, an outcome-priced chatbot can cost as much as a voice agent, while a chatbot you build costs cents to run. Voice costs more to build and test well. Our [AI chatbot development](/services/ai-chatbot-development/) page explains what drives build cost.

## Which should you choose?

### Choose a chatbot if

- Most enquiries already arrive by web chat, email or messaging.
- Answers depend on order numbers, links or documents that are easier to share in writing.
- You want every conversation easy to review in the first months.
- Your support team works in a helpdesk such as Intercom or Zendesk already.

### Choose a voice agent if

- Customers phone you, and missed calls after hours or at peak times lose work.
- The task is short and structured: take details, check availability, book.
- You can supply and test a +64 number and a reliable handover to a person.
- You have tested your callers' accents and place names and the agent handles them.

## Where do both fall short?

- **Confident wrong answers.** Both will state a price or availability that is wrong unless they look it up. Restrict them to verified sources, and see [managing AI mistakes and escalation](/learn/managing-ai-mistakes-and-escalation/).
- **Emergencies.** Twilio does not allow [calls to emergency services](https://www.twilio.com/en-us/guidelines/nz/voice) over its NZ numbers. A voice agent must tell anyone reporting an emergency to hang up and dial 111; a chatbot must say the same.
- **Privacy notices.** Under the [Privacy Act 2020](https://www.legislation.govt.nz/act/public/2020/31/en/latest/), tell people an automated assistant is answering and whether conversations are recorded or transcribed, and keep transcripts only as long as needed (IPP 9). If you use a caller's voice to identify or verify them, the [Biometric Processing Privacy Code 2025](https://www.privacy.org.nz/privacy-principles/codes-of-practice/biometric-processing-privacy-code/) may apply.
- **No way out.** An agent that cannot reach a person within one or two turns frustrates customers. Design the handover first, then the automation.

If you are weighing both for a support desk, our [AI customer support](/services/ai-customer-support/) work starts from your ticket and call history.

## Questions people ask

### Is an AI voice agent more expensive than a chatbot?

Not always. Voice platforms charge per minute: Vapi's own calculator estimated about US$0.08 to US$0.13 a minute on 19 October 2026, before carrier charges. Packaged chat agents often charge per resolved conversation, such as US$0.99 for Intercom's Fin. A chatbot built on model APIs can cost cents a conversation in model fees. Build and testing effort is usually higher for voice.

### Can an AI voice agent use a New Zealand phone number?

Yes, but you supply it. Vapi's free numbers are US-only and Retell sells only US and Canada numbers, so a +64 number comes from a carrier such as Twilio or a SIP trunk from your telco. Twilio lists NZ local numbers at $3.15 a month and asks businesses for a company registration and a street address, not a PO Box.

### Do we have to tell callers they are talking to an AI?

Under IPP 3 of the Privacy Act 2020, when you collect personal information directly you must take reasonable steps to make sure people know it is being collected, why, and who will receive it. Saying at the start of the call that an automated assistant is answering, and whether the call is recorded or transcribed, is the plain way to meet that. Do the same in chat.

### Which works better with New Zealand accents?

We cannot give you a figure, and you should distrust anyone who does without testing your callers. Speech recognition errors cluster on names, addresses, te reo Māori place names and numbers. Record 30 scripted test calls with a mix of voices and background noise, and count how often the agent captures the suburb, street number and phone number correctly before going live.


## Sources

- [Vapi pricing](https://vapi.ai/pricing)
- [Free telephony](https://docs.vapi.ai/free-telephony)
- [Retell AI pricing](https://www.retellai.com/pricing)
- [Purchase a phone number](https://docs.retellai.com/deploy/purchase-number)
- [GPT-Live-1](https://developers.openai.com/api/docs/models/gpt-live-1)
- [Voice pricing for New Zealand](https://www.twilio.com/en-us/voice/pricing/nz)
- [New Zealand regulatory guidelines](https://www.twilio.com/en-us/guidelines/nz/regulatory)
- [New Zealand voice guidelines](https://www.twilio.com/en-us/guidelines/nz/voice)
- [Fin AI Agent outcomes](https://www.intercom.com/help/en/articles/8205718-fin-ai-agent-outcomes)
- [HubSpot product and services catalogue](https://legal.hubspot.com/hubspot-product-and-services-catalog)
- [Claude API pricing](https://platform.claude.com/docs/en/about-claude/pricing)
- [Biometric Processing Privacy Code](https://www.privacy.org.nz/privacy-principles/codes-of-practice/biometric-processing-privacy-code/)
- [Privacy Act 2020](https://www.legislation.govt.nz/act/public/2020/31/en/latest/)

Published by Levy Street (https://levystreet.com), Wellington, New Zealand.