Features, pricing, and fit
Compare Copilot Studio Voice and Retell AI on voice capabilities, pricing, and fit.
Compare Copilot Studio Voice and Retell AI for AI phone agents, then match channels, workflows, and deployment models to your call flow.
Copilot Studio real-time agents deploy to voice and digital channels with a selectable GPT-Realtime native mode or GPT-5-Chat preview plus Neural TTS.
Microsoft teams that need Copilot Studio topics, tools, knowledge, handoffs, and explicit voice configuration across channels.
Explore its buying criteria: AI phone agents · Contact-center AI · Conversation builders.
Hosted voice and chat agent platform built around either node-based conversation flows or single prompts, with telephony, tools, knowledge base, and analytics.
Teams comparing a managed agent builder with both visual flow design and API/SDK control.
Explore its buying criteria: AI phone agents · Voice AI platforms · Voice evaluation and observability.
Both profiles checked 2026-09-04.
Use the table below to compare each provider’s documented scope.
Before you decide
Copilot Studio Voice: Per-user/month Dynamics 365 Contact Center licensing with Copilot pay-as-you-go credits, plus Azure and telephony costs. Retell AI: Pay-as-you-go per-minute component pricing with optional add-ons; Enterprise uses custom volume pricing and terms. Ask both vendors to quote the same expected workload, required channels, and implementation scope. Include required subscriptions and usage charges before comparing the total; the listed starting prices alone may cover different work.
The recorded knowledge and data sources for Copilot Studio Voice include Not publicly documented. For Retell AI, they include Not publicly documented. Ask each provider to demonstrate access for the exact systems you use, with permissions, freshness, and failure behavior. A source missing from this directory is not proof that a provider cannot support it.
Use the same representative calls, approved instructions, and escalation rules in both pilots. How does it handle interruption and uncertainty? Which actions can it complete, and which require approval? What context reaches a human during transfer? Record conversation quality, completed tasks, human handoffs, and total cost in the buyer worksheet. Check these specific cautions before launch: Copilot Studio Voice: Product names, licenses, previews, and architecture vary. Require a bill of materials for Copilot, Dynamics, Azure, telephony, and services. Retell AI: Component rates may not equal complete cost. Confirm concurrency, premium model/voice, transfer, storage, QA, and carrier charges.
Record your requirements and pilot results in the buyer worksheet →
Swipe or scroll the table to see every column.
| Criterion | Copilot Studio Voice | Retell AI |
|---|---|---|
| Provider type | Enterprise agent builder and contact-center AI | Voice agent platform |
| Best fit | Microsoft teams that need Copilot Studio topics, tools, knowledge, handoffs, and explicit voice configuration across channels. | Teams comparing a managed agent builder with both visual flow design and API/SDK control. |
| Key capabilities | visual authoring; native or cascaded voice; Power Platform actions; knowledge; handoff; governance | inbound and outbound agents; flow builder; testing; analytics; functions; SIP |
| Team sizes | mid-market; enterprise; contact centers; developer | startup; mid-market; enterprise; developer |
| Call surfaces | voice channels; Dynamics 365 Contact Center; digital channels | phone / PSTN; API / SDK |
| Voice stack | Native GPT-Realtime mode or cascaded GPT-5-Chat mode | Configurable STT-LLM-TTS pipeline with custom LLM option |
| Telephony | Dynamics 365 Contact Center and Azure integration paths | managed numbers; SIP trunking; bring-your-own telephony |
| Call controls | Not publicly documented | Not publicly documented |
| Languages | Not publicly documented | Not publicly documented |
| Integrations | Not publicly documented | Not publicly documented |
| Knowledge and data | Not publicly documented | Not publicly documented |
| Pricing model | Per-user/month Dynamics 365 Contact Center licensing with Copilot pay-as-you-go credits, plus Azure and telephony costs. | Pay-as-you-go per-minute component pricing with optional add-ons; Enterprise uses custom volume pricing and terms. |
| Pricing signal | Dynamics Voice $95/user/month, Contact Center $110, Premium $195, plus Azure/Copilot and telephony. | Vendor range $0.07-$0.31/min; infrastructure $0.055, typical TTS $0.015, telephony $0.015, KB $0.005, guardrails $0.005, PII removal $0.01, and QA $0.10 after 100 minutes. |
| Free plan or trial | Not publicly documented | Not publicly documented |
| What stands out | Microsoft exposes a deliberate runtime choice: GPT-Realtime uses native speech-to-speech, whereas GPT-5-Chat preview uses text reasoning with Neural TTS; voice settings also offer server or semantic VAD. | Retell documents two agent shapes—node-based flows and single prompts—and pairs them with built-in telephony, knowledge, tools, analytics, and MCP/API access. |
| Considerations | Product names, licenses, previews, and architecture vary. Require a bill of materials for Copilot, Dynamics, Azure, telephony, and services. | Component rates may not equal complete cost. Confirm concurrency, premium model/voice, transfer, storage, QA, and carrier charges. |
Microsoft teams that need Copilot Studio topics, tools, knowledge, handoffs, and explicit voice configuration across channels.
Microsoft exposes a deliberate runtime choice: GPT-Realtime uses native speech-to-speech, whereas GPT-5-Chat preview uses text reasoning with Neural TTS; voice settings also offer server or semantic VAD.
Teams comparing a managed agent builder with both visual flow design and API/SDK control.
Retell documents two agent shapes—node-based flows and single prompts—and pairs them with built-in telephony, knowledge, tools, analytics, and MCP/API access.
Verify current pricing, limits, security, and required integrations directly with each provider before purchasing.
Test recognition, speech quality, interruptions, language switching, tool use, and human transfer with your own calls in the required language. Availability can vary by model, plan, and phone route.
DocsBot documents multilingual voice workflows and Japanese support. Verify the exact voice, phone path, and transfer behavior in your pilot. Review DocsBot language information ↗
Other providers’ language claims reflect cited vendor material; confirm Japanese and other required languages directly with each provider.
Listing does not imply endorsement or a performance guarantee. This directory is published by DocsBot. Editorial policy
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