# 8 best voice AI agents for call containment in 2026

By Samuel Oram-Jones

The best voice AI agents for call containment in 2026 are Bland, PolyAI, Kore.ai, Five9, Talkdesk, Vapi, Twilio, and Retell, and Bland ranks first because it is full stack. This ranking compares each voice AI provider on what lets an agent finish a call, who builds the AI, and what a minute costs, as of November 2026.

## What are the best voice AI agents for call containment?

The best voice AI agent for call containment overall is Bland, because one company builds and runs every AI model on a call, and a call that stays with one set of models has fewer handoffs between AI companies before it is resolved.

- **Bland:** Best overall for enterprise calls that should end without a transfer
- **PolyAI:** Best for teams that want a vendor to build and run a quoted agent
- **Kore.ai:** Best for enterprises building chat and voice agents on one platform
- **Five9:** Best for contact centers that staff live agents on seats
- **Talkdesk:** Best for contact centers that want a seat-priced suite
- **Vapi:** Best for engineers wiring up their own voice stack
- **Twilio:** Best for developers building on a phone network API
- **Retell:** Best for developer teams that pick their own model and voice

| Provider | Best for | Price | Who builds the AI | iMessage |
|---|---|---|---|---|
| Bland | Enterprise calls at volume | $0.14 per minute on self-serve Start, $0.12 on self-serve Build plus $299 a month, phone billed separately | Bland builds all of it | Native on Enterprise |
| PolyAI | Managed, quoted agents | Quote only | Mixed | No |
| Kore.ai | Chat and voice on one platform | $0.20 per session on its standard plan, Enterprise by request | Undisclosed | No |
| Five9 | Seat-priced contact centers | From $159 a seat a month, with AI minutes bundled per seat | Undisclosed | No |
| Talkdesk | Seat-priced suites | From $105 a user a month for voice | Undisclosed | No |
| Vapi | Engineers building a stack | $0.05 per minute for hosting, plus providers | Other companies | No |
| Twilio | Developers on a phone network API | $0.07 per minute for Conversation Relay, plus a customer's own language model | Other companies | Private beta |
| Retell | Developer teams | $0.07 to $0.31 per minute, with the model and voice as separate lines | Other companies | No |

## What should buyers check in voice AI agents for call containment?

Call containment is the share of calls an AI agent resolves without handing them to a person, and three things decide it more than how pleasant the agent sounds: whether it can act on a caller's account, whether it hands off cleanly when it cannot, and whether a team can see where calls fall out.

Acting on an account comes first. An agent that only collects details has to transfer the call, so a buyer should ask each voice AI provider how a call reaches a customer's CRM, scheduling tool, or billing system. Bland lets teams build calls in Pathways as connected steps they can test before launch, and its pathways, integrations, and automations are on every plan.

Handoffs come second, because some calls should reach a person and a good agent knows which. PolyAI reports a containment rate as the percentage of queries resolved without escalation or handoff, and Kore.ai reports containment metrics beside its other analytics. Bland adds warm transfers and guardrails on Enterprise, and a warm transfer starts a proxy agent in the background that merges into the call.

Bland's guardrails run through a whole call, and on a violation the agent can end the call, transfer it, or take a custom action such as returning to a set part of the workflow. A new agent version can also roll out in stages that pause when a KPI such as escalation rate gets worse.

Where the call runs is the last check for regulated teams. Security rules decide where a company's audio may be processed, so it is worth asking each provider where its calls run, and Bland sets out its own answer in its [security program](https://www.bland.ai/trust-security). Enterprise customers get dedicated orchestration and dedicated GPUs run by Bland.

No provider here is ranked on a containment percentage, because a rate depends on a customer's own call mix and integrations, and a pilot on live traffic is the fair test.

Proof at volume still helps, such as a customer replacing an IVR (an automated phone menu) with a voice AI agent. Idaho Housing and Finance Association saves $750,000 a year by replacing its IVR with Bland, which handles 4,000 inbound calls a day and cut average call time by 20%.

> "We save thousands of dollars a day."

Greg Blake, Chief Information Officer, Idaho Housing and Finance Association

## How do the 8 best voice AI agents for call containment compare?

These eight voice AI providers differ most in how much of a call they build themselves, and Bland is the one that builds all of it.

![Bland's homepage, which reads Voice AI for the calls that can't go wrong.](/images/compare/bland-home.jpg)

### 1. Bland: Best overall for enterprise calls that should end without a transfer

**What does it do?** Bland is a full stack voice AI provider that builds and runs its language, speech, and transcription models for inbound and outbound calls. It publishes sub-200ms latency, support for 1 million concurrent calls, and a 99.9% uptime SLA, and it serves more than 250 enterprise customers.

**Who is it for?** Bland suits enterprises and contact centers in any industry that run high-stakes calls at volume, including teams that start with an IVR they want to replace.

<div class="cmp-proscons cmp-proscons-own"><div class="cmp-proscons-pros"><p><strong>Pros</strong></p><ul><li>No outside AI lab in the call path, so a security team reviews one AI company</li><li>Dedicated orchestration and dedicated GPUs run by Bland, on Enterprise</li><li>BAA on Enterprise, PCI DSS self-attested, FedRAMP 20x Class A</li><li>Bland Speech v3 ranked first of 13 AI voices on Audio Realism Bench on 4 August 2026</li><li>Forward-deployed engineers on Enterprise</li><li>Native iMessage agents on Enterprise, sharing pathways with voice</li><li>Alarms on latency, silences, transcription quality, and API errors</li><li>Call grading on the audio as well as the transcript</li></ul></div><div class="cmp-proscons-cons"><p><strong>Cons</strong></p><ul><li>Overkill for a small prototype, because Bland is built for production calls at volume</li></ul></div></div>

**Pricing:** Self-serve Start is $0.14 per minute with no platform fee, self-serve Build is $0.12 per minute with a $299 monthly platform fee, and [Enterprise](https://www.bland.ai/pricing) is priced to volume. Phone is billed separately at carrier cost. Enterprise adds native iMessage agents, warm transfers, a BAA, SSO, data residency, dedicated GPUs run by Bland, and forward-deployed engineers, alongside SMS and web chat.

### 2. PolyAI: Best for teams that want a vendor to build and run a quoted agent

**What does it do?** PolyAI builds and runs a voice agent for a customer on quoted per-minute pricing, with its own Raven model family beside GPT and Claude models. PolyAI also sells a Dialog-RSN-1 model API at 2¢ per connected minute, without telephony or orchestration. PolyAI gives each handoff to a person a destination and a reason, and reports containment in its analytics, as of November 2026.

**Who is it for?** PolyAI suits large consumer-facing companies that want it to build and run their agent, from hotels and restaurants to insurers and telcos.

<div class="cmp-proscons" data-rival="polyai"><div class="cmp-proscons-pros"><p><strong>Pros</strong></p><ul><li>PolyAI handles the build and the ongoing running</li><li>Has SOC 2 Type II and ISO/IEC 27001</li></ul></div><div class="cmp-proscons-cons"><p><strong>Cons</strong></p><ul><li>No public rate for a managed agent</li><li>PolyAI's contract says "the total handle time is rounded up to the next 30-second increment"</li><li>No iMessage agents</li></ul></div></div>

**Pricing:** A managed agent is quoted per minute with no public rate.

### 3. Kore.ai: Best for enterprises building chat and voice agents on one platform

**What does it do?** Kore.ai sells an enterprise agent platform for service, work, and process automation across digital and voice channels. Kore.ai has a native Voice Gateway and lets a team set speech-to-text and text-to-speech providers per language. Kore.ai reports containment metrics under analytics, as of November 2026.

**Who is it for?** Kore.ai suits large enterprises that want one platform for chat, messaging, and voice agents.

<div class="cmp-proscons" data-rival="kore-ai"><div class="cmp-proscons-pros"><p><strong>Pros</strong></p><ul><li>Chat, messaging, and voice channels on one platform</li><li>Speech providers can be set per language</li></ul></div><div class="cmp-proscons-cons"><p><strong>Cons</strong></p><ul><li>Uses undisclosed models</li><li>Enterprise pricing is customized on request</li><li>No iMessage agents</li></ul></div></div>

**Pricing:** Kore.ai's standard plan bills $0.20 per session, new workspaces get free credits worth $500, and the Enterprise plan is customized on request.

### 4. Five9: Best for contact centers that staff live agents on seats

**What does it do?** Five9 sells a cloud contact center platform priced in seat bundles, with voice, chat, email, SMS, and social messaging channels and AI added on. Five9 escalates a text interaction to a live agent on a customer's request, as of November 2026.

**Who is it for?** Five9 suits contact centers that staff human agents and want a seat-priced platform with AI add-ons.

<div class="cmp-proscons" data-rival="five9"><div class="cmp-proscons-pros"><p><strong>Pros</strong></p><ul><li>Voice, chat, email, SMS, and social channels on one platform</li><li>AI minutes bundled with each seat</li></ul></div><div class="cmp-proscons-cons"><p><strong>Cons</strong></p><ul><li>Priced per concurrent user with a minimum of 50 seats</li><li>AI beyond the bundled 3,000 minutes per seat bills as usage</li><li>No iMessage agents</li></ul></div></div>

**Pricing:** Seats start at $159 a month on its Core bundle, with 3,000 AI minutes per bundled seat plus usage, and usage-based charges may apply.

### 5. Talkdesk: Best for contact centers that want a seat-priced suite

**What does it do?** Talkdesk sells a cloud contact center platform priced per user per month, with AI agents, Copilot, and routing sold on top. Talkdesk says conversations start with virtual agents and flow to live support with context preserved, and its Interaction & Quality Analytics product analyzes 100% of interactions, as of November 2026.

**Who is it for?** Talkdesk suits contact center teams that want one seat-licensed suite for voice, digital channels, and agent assist.

<div class="cmp-proscons" data-rival="talkdesk"><div class="cmp-proscons-pros"><p><strong>Pros</strong></p><ul><li>Says it holds more than 30 certifications</li><li>Voice and digital channels in one suite</li></ul></div><div class="cmp-proscons-cons"><p><strong>Cons</strong></p><ul><li>Priced per user, so cost follows seats rather than calls</li><li>AI agents and Copilot sold on top of the seat</li><li>No iMessage agents</li></ul></div></div>

**Pricing:** Voice Essentials is $105 a user a month, higher tiers run up to $225, and a quote is requested for AI.

### 6. Vapi: Best for engineers wiring up their own voice stack

**What does it do?** Vapi is a developer platform that hosts voice agents and bills the language model, transcription, and voice from other companies on top at cost. Vapi says it passes these through with "no markup", so a team picks and wires every provider itself.

**Who is it for?** Vapi suits engineers who want to pick and swap each AI provider themselves and can run a stack of several vendors.

<div class="cmp-proscons" data-rival="vapi"><div class="cmp-proscons-pros"><p><strong>Pros</strong></p><ul><li>A team can choose every model and voice</li><li>Imported numbers are billed by a customer's own phone provider</li></ul></div><div class="cmp-proscons-cons"><p><strong>Cons</strong></p><ul><li>Language model, transcription, and voice bill from other companies on top of $0.05 hosting</li><li>HIPAA is a $2,000 monthly add-on</li><li>No iMessage agents</li></ul></div></div>

**Pricing:** $0.05 per minute for hosting, plus a language model, transcription, and voice at provider cost, which Vapi's pricing calculator puts at up to $0.0452, $0.0099, and $0.0238 a minute, before phone.

### 7. Twilio: Best for developers building on a phone network API

**What does it do?** Twilio is a cloud communications platform whose Conversation Relay product connects phone calls to a developer's own language model and adds speech recognition and text-to-speech.

**Who is it for?** Twilio suits engineering teams that write their own voice agent code, bring a language model, and want it on Twilio's phone network.

<div class="cmp-proscons" data-rival="twilio"><div class="cmp-proscons-pros"><p><strong>Pros</strong></p><ul><li>Phone network and agent connection from one company</li><li>A team can bring any language model</li></ul></div><div class="cmp-proscons-cons"><p><strong>Cons</strong></p><ul><li>Twilio calls itself "AI-neutral", so the language model and tool calling are a customer's own build</li><li>Phone minutes, recording, and text-to-speech bill separately from Conversation Relay</li></ul></div></div>

**Pricing:** Conversation Relay is $0.07 per minute, with a customer's own language model, and local calls on Twilio run $0.0085 inbound and $0.0140 outbound a minute.

### 8. Retell: Best for developer teams that pick their own model and voice

**What does it do?** Retell is a platform for building and monitoring AI voice and chat agents, billed per minute with the language model and voice priced as separate lines. A customer's own SIP trunk (a connection to the phone network) carries no Retell phone charge, and phone on Twilio or Telnyx is billed on top.

**Who is it for?** Retell suits developer-led teams that want to choose their own language model and voice and pay per minute.

<div class="cmp-proscons" data-rival="retell"><div class="cmp-proscons-pros"><p><strong>Pros</strong></p><ul><li>A wide choice of language models and voices</li><li>Has SOC 2, HIPAA, and GDPR coverage</li></ul></div><div class="cmp-proscons-cons"><p><strong>Cons</strong></p><ul><li>Advertises "We guarantee >99.9% uptime", while its terms say "at least 99.5% uptime"</li><li>PII (personal data) Removal adds $0.01 a minute</li><li>No iMessage agents</li></ul></div></div>

**Pricing:** $0.07 to $0.31 per minute depending on the language model and voice, with Retell Voice Infra, GPT-4.1, and an ElevenLabs Flash voice coming to $0.14 per minute before phone.

### How were these voice AI agents ranked?

Providers were compared on what lets an agent finish a call, who builds the AI, deployment, price per minute, and voice realism, with weight on what enterprise calls at volume need. Every claim about a provider comes from its own public pages as read in November 2026, and voice scores come from Design Arena's chart of 4 August 2026.

Closer comparisons sit in [Bland vs PolyAI](/compare/bland-vs-polyai), [Bland vs Vapi](/compare/bland-vs-vapi), [Bland vs Retell](/compare/bland-vs-retell), and the [Contact center AI voice agents](/blog/best-voice-ai-agents-contact-centers), and a [demo](https://www.bland.ai/book-a-demo) built on a real customer workflow is the quickest way to measure containment. Teams chasing fewer escalations can also read about [Conversational AI platforms for ticket deflection](/blog/best-conversational-ai-ticket-deflection), and those watching call length will find [Voice AI agents to reduce average handle time](/blog/best-voice-ai-agents-reduce-average-handle-time) useful.

## How much do voice AI agents for call containment cost?

Voice AI agents for call containment are sold three ways, by the minute, by the seat, and by quote, so each price below states its basis. Bland's self-serve Start plan is $0.14 per minute for its language model, transcription, and speech together, and Bland replaced an earlier flat $0.09 rate with Start and Build in December 2025. Enterprise pricing is custom, set with Bland's sales team.

![Bland's pricing page, with self-serve Start at $0.14 a minute, self-serve Build at $0.12 a minute, and custom Enterprise pricing.](/images/compare/bland-pricing.jpg)

Every total below is AI before phone, with Vapi at its calculator defaults. Retell's card adds Retell Voice Infra, GPT-4.1, and an ElevenLabs Flash voice to reach $0.14 per minute, while Retell publishes a range of $0.07 to $0.31 per minute depending on the model and voice.

PolyAI quotes a managed agent with no public rate, Kore.ai bills by session, and Five9 and Talkdesk bill by seat, so no per-minute bill can be added up for them. Twilio's Conversation Relay at $0.07 a minute leaves the language model to the customer.

| Vendor | What a minute pays for | Total per minute | Phone |
|---|---|---|---|
| Bland Start (self-serve) | All AI: model, transcription, speech $0.14 | $0.14 before phone | Billed separately at carrier cost |
| Retell | Voice infrastructure $0.055, GPT-4.1 $0.045, ElevenLabs Flash voice $0.04 | $0.14 before phone | Twilio at $0.015 a minute, billed on top |
| Vapi | Hosting $0.05, Transcription $0.0099, Language model $0.0452, Voice $0.0238 | $0.1289 before phone | Free on Vapi numbers, billed on top on Twilio at up to $0.014 a minute |

Bland Start (self-serve): Self-serve Start has no platform fee. Self-serve Build is $0.12 a minute plus $299 a month. Phone and transfers bill separately. Retell: Retell Voice Infra, GPT-4.1, and an ElevenLabs Flash voice, before Twilio phone minutes. Vapi: Hosting plus the top of each range on Vapi's pricing calculator, before phone.

For outbound sales calls, a separate comparison of [Regie.ai vs 11x vs Artisan](/blog/bland-vs-regie-ai-vs-11x-vs-artisan) covers that category, and a roundup of [AI telemarketing software](/blog/bland-vs-retell-vs-synthflow-vs-vapi) sets Bland beside Retell, Synthflow, and Vapi.

## Which voice AI agent for call containment sounds most like a real person?

Bland Speech v3 ranked 1st of 13 AI voices on Design Arena's Audio Realism Bench on 4 August 2026, at 1365, and every outside voice in those results that Retell and Vapi let a customer choose scored lower.

On Retell and Vapi the highest outside voice was OpenAI's GPT Realtime 2, 4th at 1119.

See [Design Arena's published results](https://notes.designarena.ai/audio-realism-benchmark-measuring-realism-in-audio-models/).

## Frequently asked questions

### What is the best voice AI agent for call containment?

Bland is the best voice AI agent for call containment as of November 2026, because one company builds every model on a call, and teams test calls in Pathways before launch. Enterprise customers get dedicated orchestration and dedicated GPUs run by Bland.

### What is call containment in a voice AI agent?

Call containment is the share of calls a voice AI agent resolves without handing them to a person. It depends on whether the agent can act on a caller's account, hand off cleanly when it must, and report where calls fall out.

### Can a voice AI agent replace an IVR?

Yes, a voice AI agent can replace an IVR. Idaho Housing and Finance Association replaced its IVR with Bland, which handles 4,000 inbound calls a day, as of November 2026.

### Is Bland only for outbound calls?

No, Bland runs inbound and outbound calls, including AI receptionist and contact center work, and it also runs SMS and web chat.

### Is Bland only for developers?

No, Bland isn't only for developers. Pathways gives teams a visual builder, Norm helps build agents, and on Enterprise forward-deployed engineers build alongside a customer's team.

### Does Bland use an open-source model?

No, Bland operates a closed-source model that it developed itself, so its language model isn't an open-source model and no outside AI lab sits behind it.

### Which voice AI agents for call containment support iMessage?

Bland runs branded iMessage agents natively on its Enterprise plan. Twilio offers Apple Messages for Business as a private beta, while PolyAI, Kore.ai, Five9, Talkdesk, Vapi, and Retell don't offer iMessage agents as of November 2026.

### How much does a voice AI agent for call containment cost per minute?

Rates run from $0.05 per minute for hosting alone on Vapi to $0.07 to $0.31 on Retell depending on the model and voice, while PolyAI quotes by contract and Five9 and Talkdesk charge by seat. Bland is $0.14 per minute on self-serve Start for all of its AI, before phone.

### Can I keep my phone carrier if I move to Bland?

Yes, Bland connects to a carrier or phone system over SIP, so numbers and routing stay in place.