Agentic Index
Five9 vs Retell AI (2026)
Both deploy voice agents and they sell to entirely different people, at 11.5 and 12 of 14. That verdict is the Agentic Index coverage score, graded from each vendor's own published materials.
Five9 is enterprise contact centre software with Genius AI and Voice AI Agents, seat based through sales. Retell is a developer platform with a build, test, deploy and monitor lifecycle, batch calling, public APIs and SOC 2, HIPAA and GDPR compliance, pay as you go from zero with ten dollars of free credits. Five9 is bought by a contact centre director; Retell is adopted by an engineer on a Tuesday.
This comparison is published by Agentic Index, an independent agentic AI vendor research platform. Five9 and Retell AI are each graded against the same 14 capability Agentic Index taxonomy, from the vendor's own public materials under the Agentic Index verification standard, alongside 969 researched vendors. No vendor pays for placement and no vendor has reviewed this page. How this evidence is graded
Choose Five9 if
- You are running a contact centre operation rather than adding voice to a product.
- Live agent handoff and workforce integration are requirements at your scale.
- An enterprise vendor accountable under contract is what your organization needs.
Choose Retell AI if
- Your engineers are building the voice experience and want APIs, not a platform.
- Pay as you go with free credits means you can prototype today.
- Batch calling and a build test deploy lifecycle is the developer workflow you want.
| At a glance | Five9 | Retell AI |
|---|---|---|
| Category | Customer support agent | Customer support agent |
| Entry price | Seat based subscription sold through sales, with AI Agents and Voice AI Agents priced on consumption; no public rates retrieved this session. | Pay as you go from $0 ($10 free credits); voice engine $0.07 to $0.08/min plus LLM and telephony billed separately; Enterprise custom |
| Free / trial | No public free tier or self serve trial; demos and quotes through sales | $10 in free credits and 20 concurrent calls to build and test, no card |
| Pricing confidence | contact only | public partial |
| Feature | F Five9 |
R Retell AI |
|---|---|---|
| Action & orchestration | ||
|
Integrations & Tool Calling Ability to connect agents to real systems through native integrations, OAuth-authenticated actions, custom tools, APIs, webhooks, or MCP-compatible tools. |
Full / Explicit | Full / Explicit |
|
Workflow Orchestration Ability to sequence, branch, retry, route, and combine deterministic workflow nodes with autonomous agent steps. |
Full / Explicit | Full / Explicit |
|
Triggers & Channel Coverage How agents wake up and where they work: schedules, webhooks, message events, CRM events, inbox events, chat, email, voice, and collaboration tools. |
Full / Explicit | Full / Explicit |
| Knowledge & context | ||
|
Knowledge Grounding & RAG Ability to ground agent behavior in company data through document ingestion, retrieval, external knowledge APIs, semantic search, or RAG layers. |
Full / Explicit | Full / Explicit |
|
Memory & State Persistence Ability to persist context across a run, conversation, workflow, user, team, or longer-term memory layer. |
Partial | Full / Explicit |
| Control & trust | ||
|
Human Oversight & Guardrails Approval steps, consent checkpoints, escalation rules, structured guardrails, policy constraints, and pause/resume controls. |
Full / Explicit | Full / Explicit |
|
Security, Identity & Governance RBAC, SSO, auditability, encryption, least-privilege tool access, compliance posture, and data handling policy. |
Full / Explicit | Full / Explicit |
|
Observability & Auditability Traces, logs, execution histories, metrics, audit events, and debugging detail for production agent behavior. |
Full / Explicit | Full / Explicit |
|
Deployment & Data Residency Deployment modes and options, including SaaS, dedicated cloud, VPC, on-prem, hybrid, local runtime, and self-hosting. |
Partial | No / Not documented |
| Solution readiness | ||
|
Prebuilt Agents, Templates & Packs Ready-made workflows, packaged employees, templates, blueprints, industry solutions, and role-specific agents that reduce time-to-value. |
Full / Explicit | Full / Explicit |
| Platform extensibility | ||
|
Model Flexibility & Routing Ability to work across multiple foundation models, route tasks to different models, or let buyers bring their own providers and keys. |
Partial | Full / Explicit |
|
APIs, SDKs & MCP Extensibility Composability layer: stable APIs, SDKs, MCP tool consumption/serving, custom tools, and integration into internal systems. |
Full / Explicit | Full / Explicit |
|
Testing, Debugging & Optimization Testing, debugging, scoring, retries, fallbacks, quality gates, and optimization loops for improving agent workflows before and after deployment. |
Full / Explicit | Full / Explicit |
| Specialist automation | ||
|
Browser & Computer Use Browser, desktop, or remote/local computer control for workflows that cannot be handled through stable APIs alone. |
No / Not documented | No / Not documented |
Pricing snapshot
Sourced from the Index pricing dataset · open each vendor's profile for full detail.
| Pricing | F Five9 |
R Retell AI |
|---|---|---|
|
Entry price Lowest public entry point |
Seat based subscription sold through sales, with AI Agents and Voice AI Agents priced on consumption; no public rates retrieved this session. | Pay as you go from $0 ($10 free credits); voice engine $0.07 to $0.08/min plus LLM and telephony billed separately; Enterprise custom |
|
Pricing confidence How public the numbers are |
Contact only | Public, partial |
|
Billing Primary billing axis |
per seat subscription editions plus consumption based AI Agent usage | usage (per minute across voice engine, LLM, and telephony components) |
|
Variable cost Workload / overage exposure |
High variable cost | High variable cost |
|
Free tier / trial Try before you buy |
No free tier
|
Free tierTrial
|
|
Buying motion Self-serve vs sales call |
Sales call | Mixed |
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