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Comparison LabCompare 27 voice AI platforms and components across seven buying contexts, with sourced capabilities, current price captures and visible unknowns.Voice AI Price Index: prices, evidence and historyUnderstand the complete voice-agent cost stack: models, voice, transcription, telephony, subscriptions, capacity and add-ons.Know the cost before the first callEstimate monthly voice-agent costs, AI minutes, setup expenses and volume scenarios using your own transparent assumptions.AI voice agents for dentalAppointments, rescheduling and after-hours calls—with a person ready for clinical questions. Explore call flows, safe automation, integrations, tests and cost considerations.

Pricing intelligence

Cost per minute: compare the stack, not the headline

Learn why platform hosting, LLM, TTS, STT and carrier fees must be aligned before voice-agent per-minute prices are comparable.

Checked Official sources · Independent editorial analysis

The useful answer

Two per-minute prices are comparable only when they cover the same stack. A hosting fee, a model-inclusive rate and a subscription with included minutes are different products. Name every included and excluded component before multiplying by volume.

The stack behind a minute.

Platform & orchestration

The service coordinating the call. It may be priced per minute, by subscription, or in a custom agreement.

LLM, voice & transcription

The components that understand the call and generate a spoken response. A rate may bundle them or charge them separately.

Telephony & numbers

Carrier rates vary by destination and direction. Number rental and human-transfer time may add separate charges.

Capacity, support & setup

Peak concurrency, service packages, integrations and implementation can change the budget without changing call volume.

Normalize the configuration before the total.

  1. Hold monthly AI minutes constant: for example, 1,000, 5,000 or 10,000.
  2. Specify the same model capability, voice needs, carrier destination and calling direction.
  3. Allocate subscriptions and included minutes correctly; do not charge the full rate again for included usage.
  4. Keep burst traffic, setup and optional services separate from ordinary recurring usage.

Our custom calculator intentionally uses a combined AI rate plus telephony. It cannot normalize an unspecified vendor configuration. Get the complete rate first, or keep the vendor total unknown.

Open this in the calculator

Four pricing structures to keep separate.

Retell AI

Configuration-based usage. The advertised $0.07–$0.31/min range is configuration-dependent, not a ceiling for every model and add-on.

Retell pricing (opens in new tab)

ElevenLabs Agents

Plan + included minutes + overage. Creator is $22/month at the regular monthly rate; a temporary first-month discount is not used in comparisons.

ElevenAgents pricing (opens in new tab)

Vapi

Hosting + provider pass-through. $0.05/min is Vapi hosting only. It is not the total call cost.

Vapi pricing (opens in new tab)

Synthflow

Sales-led, scoped agreement. Unable to normalize this configuration from public pricing.

Billing overview (opens in new tab)

Ask for an itemized quote.

Give the vendor your expected volume and busiest calling window. Request the rate basis, minimum commitments, included allowances, overages, carrier charges, add-ons and renewal terms. Ask how silence, retries, failed calls and transfers are billed.

Record the quoted date and configuration. Recheck when a model, plan, carrier or use case changes. A budget based on last quarter’s default model is not evidence for today’s production setup.

Evidence, in the open

Go to the source.

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Product capabilities are documented vendor statements. We have not independently benchmarked call quality or latency. How we evaluate evidence.