9 Best AI Voice Agent Platforms of 2026

1. 1

   Retell AI

   A voice agent platform with a visual call-flow builder, an API and SDKs, billed per minute with no contract on the entry plan.

   8.9overall

   A voice agent platform with a visual call-flow builder, an API and SDKs, billed per minute with no contract on the entry plan.

   Best forDevelopers who want phone agents live fast with 20 free concurrent calls

   Adoption data

   $80 millionRetell's About page, checked in November 2026, says the company doubled to $80 million in annualized revenue less than a year after crossing $40 million.

   Retell AI, About Retell AI (2026): “Less than a year after crossing $40M, Retell doubled to $80M in annualized revenue”

   Retell AI publishes its price as a set of parts, which helps developers model costs before writing code. Voice infrastructure costs $0.055 a minute, Retell's own voices add $0.015, US telephony through Twilio adds $0.015, and the LLM ranges from fractions of a cent to $0.32 a minute, which produces the stated range of $0.07 to $0.31. New accounts get $10 in credits and 20 concurrent calls at no charge, with extra lines at $8 a month each. The builder covers visual call flows, function calls, warm handoffs, outbound batch campaigns and IVR handling, and a simulation suite can replay production calls as tests. Retell says its agents respond in about 600 ms and lists HIPAA, SOC 2 Type II, GDPR and ISO 27001. Its About page reports $80 million in annualized revenue, the clearest scale disclosure among the developer platforms here. Teams should budget for add-ons such as branded caller ID at $0.10 per outbound call and AI quality checks at $0.10 a minute after the first 100.

   Strengths

   • +20 concurrent calls included free, then $8 per extra line per month
   • +Itemized component prices, from $0.055 per minute for voice infrastructure
   • +Vendor states about 600 ms latency

   Limitations

   • −Real cost depends on the LLM: GPT 5.5 adds $0.16 per minute
   • −Branded caller ID costs $0.10 per outbound call
   • −Dedicated servers and implementation support are Enterprise add-ons

   SummaryRetell AI is the best choice for developers who want a production phone agent without a contract because it includes 20 concurrent calls and prices every component in public. Pick a cheap LLM tier to stay near the $0.07 floor.

2. 2

   Vapi

   An API-first platform for building voice agents that bills a hosting fee per minute and passes model costs through at cost.

   8.9overall

   An API-first platform for building voice agents that bills a hosting fee per minute and passes model costs through at cost.

   Best forEngineering teams that want to pick each model and pay providers at cost

   Adoption data

   1 millionVapi's homepage, checked in November 2026, reports more than 1 million developers and 2.5 million agents launched on the platform.

   Vapi, Vapi homepage (2026): “2.5M+ agents launched 1M+ developers”

   Vapi charges a flat $0.05 a minute for hosting and passes transcription, LLM and voice costs through without markup, so the bill tracks whichever providers you choose. Its own calculator puts 1,000 minutes with Deepgram, OpenAI and ElevenLabs at $82 to $129 a month. Without a success package you get $5 in credits, one phone number and four concurrent calls; the $29 Core package raises that to 10 calls, five numbers, 30 days of data retention and zero data retention as an option. Pro costs 10 percent of the hosting fee with a $999 monthly minimum and adds a 99 percent uptime SLA. Vapi telephony and SIP are free, and Twilio inbound runs $0.008 a minute. The homepage reports more than 1 million developers, 2.5 million agents and 1 billion calls supported, plus an average latency under 500 ms. HIPAA eligible data handling is a $2,000 monthly add-on, which matters for small healthcare teams.

   Strengths

   • +$0.05 per minute hosting fee with no minimum minutes
   • +Vendor states average latency under 500 ms
   • +Core package at $29 a month raises concurrency to 10 calls and adds zero data retention

   Limitations

   • −Only 4 concurrent calls without a success package
   • −Vapi's own estimate for 1,000 minutes is $82 to $129 once models are added
   • −Pro package has a $999 monthly minimum

   SummaryVapi is the best choice for engineering teams that want to swap models freely because it charges $0.05 a minute for hosting and passes model costs through at cost. Budget for the $29 Core package once you need more than four calls at once.

3. 3

   ElevenLabs Agents

   ElevenLabs' voice and chat agent platform, billed by call minutes on monthly plans with a free tier.

   8.8overall

   ElevenLabs' voice and chat agent platform, billed by call minutes on monthly plans with a free tier.

   Best forTeams that want a free tier and bundled call minutes

   Adoption data

   7.5 millionElevenLabs says on its agents page, checked in November 2026, that it is trusted by more than 7.5 million companies and creators across its products.

   ElevenLabs, ElevenLabs conversational AI page (2026): “Trusted by 7.5M+ companies & creators”

   ElevenLabs Agents sells call minutes in monthly bundles rather than as a pure meter. The free plan includes 15 minutes and four concurrent calls, Starter costs $6 a month for 75 minutes, Creator $22 for 275, Pro $99 for 1,238 and Business $990 for 12,375 minutes with 40 concurrent calls. Extra minutes cost $0.08 on every tier, and burst pricing lets agents run up to three times the plan's concurrency at $0.16 a minute. LLM usage is billed separately at the model's rate, while ElevenLabs adds no telephony fee: you connect Twilio, Vonage, Telnyx, Plivo or a SIP trunk and pay that carrier directly. Every plan includes the workflow builder, knowledge bases, RAG and multilingual widgets, and there is no cap on the number of agents. The 7.5 million figure covers all ElevenLabs products, not only agents. Enterprise adds BAAs, SSO and higher concurrency, and a startup grant offers 12 months free.

   Strengths

   • +Permanent free plan for testing
   • +Starter costs $6 a month with 75 call minutes
   • +Extra minutes cost $0.08 on every plan

   Limitations

   • −LLM usage is billed on top of call minutes
   • −Free plan allows only 4 concurrent calls
   • −BAAs for HIPAA customers require Enterprise

   SummaryElevenLabs Agents is the best choice for teams that want to start free because its permanent plan includes 15 call minutes and its $6 Starter plan adds 75. Add the LLM cost to the $0.08 minute rate when you model a full month.

4. 4

   Twilio ConversationRelay

   A Twilio Voice service that handles speech-to-text and text-to-speech over a WebSocket while you bring your own LLM.

   8.5overall

   A Twilio Voice service that handles speech-to-text and text-to-speech over a WebSocket while you bring your own LLM.

   Best forDevelopers already on Twilio who run their own LLM backend

   Adoption data

   400K+Twilio's company page, checked in November 2026, reports more than 400,000 customers across its communications platform.

   Twilio, About Twilio (2026): “400K+ customers”

   ConversationRelay is a building block rather than a full agent platform. Twilio runs the speech-to-text and text-to-speech, streams text to your server over a WebSocket, and speaks the reply your LLM returns. That gives developers full control of prompts, tools and model choice, and it suits teams that already use Twilio numbers. The price is $0.07 a minute on top of normal Twilio voice: $0.0085 a minute to receive calls on a US local number, $0.0140 to place them, and $1.15 a month per local number. Twilio publishes a median latency under 0.5 seconds and under 0.725 seconds at the 95th percentile, among the few vendors here to give a percentile figure. Turn-taking uses Deepgram Flux, with automatic language detection and SSML. Live agent transfer and transcript storage through Conversational Intelligence are built in. The trade-off is engineering time: there is no hosted prompt editor or flow builder, so you write and run the agent yourself.

   Strengths

   • +Published latency: under 0.5 s median and under 0.725 s at the 95th percentile
   • +$0.07 per minute flat on top of standard Twilio voice
   • +Free trial with no credit card

   Limitations

   • −You build and host the LLM logic and WebSocket server yourself
   • −Voice minutes and numbers are billed separately, local numbers $1.15 per month
   • −No visual agent builder on this page

   SummaryTwilio ConversationRelay is the best choice for developers who already run their own LLM backend because it adds speech handling to Twilio Voice for $0.07 a minute. Teams that want a hosted builder should start with Retell AI or Vapi instead.

5. 5

   Deepgram Voice Agent API

   A single WebSocket API that bundles Deepgram speech-to-text, a managed LLM and text-to-speech at one per-minute rate.

   8.4overall

   A single WebSocket API that bundles Deepgram speech-to-text, a managed LLM and text-to-speech at one per-minute rate.

   Best forDevelopers who want one all-in rate for speech, LLM and voice

   Adoption data

   1,000Deepgram's Voice Agent API page, checked in November 2026, says more than 1,000 organizations have built on the product.

   Deepgram, Deepgram Voice Agent API (2026): “Over 1,000 organizations have built on Deepgram Voice Agent API”

   Deepgram's Voice Agent API is the cheapest all-in meter in this list. The standard tier costs $0.075 a minute and covers Deepgram speech-to-text, a managed language model and text-to-speech, so there is no separate LLM bill. Bringing your own voice drops the rate to $0.065, your own LLM also to $0.065, and both to $0.050; an Advanced tier costs $0.163. Billing runs on WebSocket connection time. New accounts get $200 in credit with no card and no expiry, and the Growth plan, from $4,000 a year in prepaid credit, trims rates by up to 20 percent and allows up to 60 concurrent agents in North America. Endpoints run in global, EU, India and Australia regions. Deepgram says more than 1,000 organizations have built on the Voice Agent API and that 650,000 developers use its wider platform. It is an API, not a phone system: you connect a carrier such as Twilio and host the bridge yourself.

   Strengths

   • +$0.075 per minute includes the LLM, unlike most per-minute platforms
   • +$200 free credit with no card and no expiry
   • +Growth prepay cuts the standard rate to $0.068

   Limitations

   • −You supply telephony and the call-handling app
   • −Advanced tier costs $0.163 per minute
   • −Growth requires $4,000 or more in yearly prepaid credits

   SummaryDeepgram Voice Agent API is the best choice for developers who want a predictable all-in rate because $0.075 a minute covers speech, a managed LLM and voice. Plan to bring your own telephony.

6. 6

   Cartesia

   A speech model company whose Managed Agents product runs phone agents on its own Sonic and Ink models.

   8.2overall

   A speech model company whose Managed Agents product runs phone agents on its own Sonic and Ink models.

   Best forCost-focused teams running high outbound or inbound call volume

   Adoption data

   5 millionCartesia's homepage, checked in November 2026, says customer EliseAI runs more than 5 million voice calls a month on Cartesia.

   Cartesia, Cartesia homepage (2026): “EliseAI runs 5M+ voice calls a month on Cartesia.”

   Cartesia builds the Sonic text-to-speech and Ink speech-to-text models, and Managed Agents packages them into phone agents. The agent rate is $0.03 a minute, shown as cut from $0.06, and calls on a Cartesia number add $0.014. You choose the LLM per agent from Cartesia's list. Plans start free with $1 of prepaid agent usage and 20,000 credits a month; Pro costs $5 with $5 of agent usage, Startup $49 and Scale $299 with higher concurrency. Outbound batch calling queues up to 5,000 numbers and dials as capacity frees, and inbound numbers can be Cartesia, Twilio or SIP. Every call keeps its recording, transcript and summary, and browser test calls can be scored against your own metrics. Cartesia lists HIPAA, SOC 2 Type 2 and GDPR and offers on-premise and on-device deployment. Its only published volume figure is one customer, EliseAI, at more than 5 million calls a month, so the adoption score is conservative.

   Strengths

   • +$0.03 per minute agent rate, the lowest headline rate here
   • +Free plan includes $1 of agent usage each month
   • +HIPAA, SOC 2 Type 2 and GDPR

   Limitations

   • −No company-wide customer count published, only a single customer's call volume
   • −Cartesia numbers add $0.014 per minute
   • −The $0.03 rate is marked as a reduction from $0.06, so it may change

   SummaryCartesia is the best choice for cost-focused teams with high call volume because its Managed Agents rate is $0.03 a minute. Confirm the rate in writing, since the page marks it as a reduction from $0.06.

7. 7

   Bland AI

   An enterprise voice AI platform that runs phone agents on its own speech and language models at one per-minute rate.

   8.1overall

   An enterprise voice AI platform that runs phone agents on its own speech and language models at one per-minute rate.

   Best forRegulated companies that want LLM, STT and TTS in one rate

   Adoption data

   230Bland's homepage, checked in November 2026, says more than 230 regulated companies run on its platform.

   Bland AI, Bland enterprise voice AI platform (2026): “230+ regulated companies run on Bland”

   Bland runs every layer of the call on its own models, so its per-minute rate includes the language model, transcription and voice with no token charges. The Start plan costs $0.14 a minute with no platform fee, two credits and an inbound number, but it is capped at 10 concurrent calls, 100 calls a day and one voice. Build costs $0.12 a minute plus $299 a month and lifts limits to 50 concurrent calls and 2,000 calls a day. Transfer time is billed at $0.05 or $0.04 a minute, and telephony is extra unless you bring your own Twilio account or SIP trunk. Bland lists SOC 2 Type I and II, HIPAA with a BAA, PCI DSS self-attestation, ISO 27001 and FedRAMP 20x Class A, and says more than 230 regulated companies run on it. Many advanced features, including warm transfers, SMS nodes, guardrails and BAAs, are reserved for Enterprise contracts.

   Strengths

   • +$0.14 per minute covers model, transcription and voice
   • +No platform fee or card on the Start plan
   • +BYOT customers pay no transfer fees

   Limitations

   • −Start plan caps use at 100 calls a day and 10 concurrent calls
   • −Warm transfers, SMS and BAA are not on the self-serve plans
   • −Build plan adds a $299 monthly platform fee

   SummaryBland AI is the best choice for regulated companies that want one vendor for every model layer because $0.14 a minute covers LLM, STT and TTS. Developers who need warm transfers on a self-serve plan should look at Retell AI.

8. 8

   PolyAI

   An enterprise agentic dialog platform with self-serve plans that bundle voice minutes, numbers and integrations.

   8.1overall

   An enterprise agentic dialog platform with self-serve plans that bundle voice minutes, numbers and integrations.

   Best forBusinesses that want a bundled monthly plan with minutes included

   Adoption data

   1 billionPolyAI's About page, checked in November 2026, says more than 1 billion real conversations power its dialog models.

   PolyAI, About PolyAI (2026): “1B+ real conversations power our dialog models”

   PolyAI has long sold custom voice agents to large brands and now also publishes self-serve plans. Essentials costs $49 a month for 250 minutes, one number and five simultaneous calls, then 30 cents a minute; Plus costs $199 for 1,000 minutes at 25 cents overage; Scale costs $299 per location for 1,500 pooled minutes at 20 cents, across up to nine locations. Integrations grow by tier, from Google Calendar, Calendly and Zapier on Essentials to Salesforce, Zendesk, Amazon Connect and Webex on Scale. The Wren agent drafts and tests agents from plain-English instructions. PolyAI publishes cascade latency of about 280 to 600 ms, supports 75 languages and says more than 1 billion real conversations power its models; one customer, SafeRide Health, scaled to a million calls a month. For developers there is also the Dialog-RSN-1 API. The bundled minutes make bills simple, but at 250 minutes Essentials works out to about 20 cents a minute before overage.

   Strengths

   • +Essentials includes a number, 250 minutes and 5 simultaneous calls for $49
   • +Published cascade latency of about 280 to 600 ms
   • +Free trial on self-serve plans

   Limitations

   • −Overage of 30 cents a minute on Essentials is high next to developer platforms
   • −HIPAA is reserved for Enterprise
   • −Only 5 simultaneous calls on Essentials

   SummaryPolyAI is the best choice for businesses that want minutes, a number and calendar integrations in one monthly bill because Essentials bundles 250 minutes for $49. High-volume developers will pay less per minute on Retell AI or Deepgram.

9. 9

   Synthflow

   An enterprise AI voice agent platform sold on annual contracts that cover telephony, integrations and launch support.

   7.5overall

   An enterprise AI voice agent platform sold on annual contracts that cover telephony, integrations and launch support.

   Best forMid-market and enterprise contact centers and BPOs

   Adoption data

   1 millionSynthflow's pricing page, checked in November 2026, says the platform powers more than 1 million calls a day in more than 30 countries.

   Synthflow, Synthflow AI voice agent pricing (2026): “Powering 1M+ calls daily in 30+ countries”

   Synthflow has moved fully to enterprise sales. Its pricing page says every new deployment starts on an annual agreement scoped to call volume, phone system, integrations, security needs and launch support, with no free plan, no trial and no per-minute rate. That rules it out for developers who want to build on a credit card, but it fits contact centers that want one contract covering telephony, CRM and contact-center integrations and launch work by forward-deployed engineers. Synthflow says it powers more than 1 million calls a day in more than 30 countries, and its homepage counts more than 100 enterprise customers. Batteries Plus runs its agents inside Zoom Phone across more than 700 US locations. The Trust Center lists SOC 2 Type 2, ISO/IEC 27001, GDPR, PCI DSS v4.0.1 and self-attested HIPAA. BPOs can run client workspaces under their own brand. Because no price is published, its value score is the lowest here.

   Strengths

   • +Discloses volume of 1M+ calls a day
   • +Contracts scope concurrency, routing and fallback logic
   • +White-label option for agencies and BPOs

   Limitations

   • −No free plan, trial or per-minute price
   • −Annual contract required for every new deployment
   • −Not suited to developers who want to prototype alone

   SummarySynthflow is the best choice for enterprises and BPOs that want a scoped annual contract because it bundles telephony, integrations and launch support and reports 1M+ calls a day. Developers comparing per-minute prices should start elsewhere.

Questions or corrections: editorial@statlyst.com · Disclosure