Comparison
Five9 vs Sierra
Compare documented workflows and implementation requirements using attributed public sources. Facts last checked , the earlier of the two records. Machine-readable record.
Start with your setup
These are documented product differences and requirements. A feature list or a single customer report does not establish which agent will perform better for your team.
Deployment model
Five9
The AI agent capability is delivered as a cloud add-on to the Five9 contact-centre platform, sold on top of per-concurrent-user bundles priced from $119 (Digital) and $159 (Core) per seat per month.Vendor-reported
- Source
- Five9 Pricing
- Checked
- History
- First published
- Correct this
- Request a correction with a public source. Claim ID
five9-deployment
Sierra
Sierra documents configuration through Agent Studio and custom integrations for proprietary systems. Deployment work includes defining journeys and connecting the systems those journeys use.Vendor-reported
- Source
- Agent Studio (Sierra)
- Checked
- History
- First published
- Correct this
- Request a correction with a public source. Claim ID
sierra-deployment
Actions in backend systems
Five9
Five9 states that AI Agents handle "multi-step requests, shifting intent and real action across your business systems," with the broader platform exposing CRM integrations, APIs and SDKs, and workflow automation.Vendor-reported
- Source
- Five9 AI Agents
- Checked
- History
- First published
- Correct this
- Request a correction with a public source. Claim ID
five9-actions
Sierra
The SDK lists subscription updates and warranty submissions as examples of actions through connected systems. Required permissions and workflow configuration depend on the implementation.Vendor-reported
- Source
- Agent SDK (Sierra)
- Checked
- History
- First published
- Correct this
- Request a correction with a public source. Claim ID
sierra-actions
Human handoff
Five9
Five9 states that on escalation "full conversation context transfers instantly to a live agent," and CX Today reported configurable guardrails that route conversations to a human when required.Vendor-reported
- Source
- Five9 AI Agents
- Checked
- History
- First published
- Correct this
- Request a correction with a public source. Claim ID
five9-handoff-compare
Sierra
The SDK documents routing to a team member with an automatic conversation summary.Vendor-reported
- Source
- Agent SDK (Sierra)
- Checked
- History
- First published
- Correct this
- Request a correction with a public source. Claim ID
sierra-handoff
Side by side
Product attributes first, then what the sources establish for each customer workflow, then the industries they place each agent in. Open any claim to see its source, the date it was checked, and how to request a correction. Two agents are rarely documented to the same depth, so read a difference between the two columns as a difference in the public record before reading it as a difference in the products.
What this agent was judged by
The independent evidence behind these states comes mainly from analysts and trade press.States rest on 1 independent source across analysts and trade press. This is not the same yardstick for every agent, and that asymmetry is a known limitation.
What this agent was judged by
No independent source has been found for any fit area, so every state here rests on vendor material or nothing.States rest on 0 independent sources. This is not the same yardstick for every agent, and that asymmetry is a known limitation.
| Attribute | Five9 | Sierra |
|---|---|---|
| Review basis | Source-based review | Source-based review |
| Deployment model | The AI agent capability is delivered as a cloud add-on to the Five9 contact-centre platform, sold on top of per-concurrent-user bundles priced from $119 (Digital) and $159 (Core) per seat per month.Vendor-reported
| Sierra documents configuration through Agent Studio and custom integrations for proprietary systems. Deployment work includes defining journeys and connecting the systems those journeys use.Vendor-reported
|
| Channels | Five9 markets both "Voice AI Agents" for automating routine customer interactions and "Digital AI Agents" providing personalized self-service via chatbots and social messaging.Vendor-reported
| Vendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT.Vendor-reported
|
| Languages | Unknown | The current Channels page describes voice models tuned for 60+ locales. A locale is not the same as a language; verify the exact language, accent and channel required for your deployment.Vendor-reported
|
| Help desk and CRM integrations | CX Today reported that Five9 AI Agents integrate with ServiceNow Customer Service Management through the Five9 TranscriptStream API, with availability stated for the first half of 2025.Independent report
| Agent Studio lists 40+ prebuilt integrations for knowledge, systems of record and contact centers, but this page does not identify the help-desk connectors. Confirm your help desk and required handoff behavior with Sierra.Vendor-reported
|
| Knowledge sources | Five9 states that AI Knowledge uses GenAI and Retrieval Augmented Generation to "identify and summarize relevant, trusted answers from customer knowledge assets" uploaded as knowledge articles, FAQ documents and product information.Vendor-reported
| The SDK documents ingestion of company FAQs, policies and documentation into its knowledge engine.Vendor-reported
|
| Actions in backend systems | Five9 states that AI Agents handle "multi-step requests, shifting intent and real action across your business systems," with the broader platform exposing CRM integrations, APIs and SDKs, and workflow automation.Vendor-reported
| The SDK lists subscription updates and warranty submissions as examples of actions through connected systems. Required permissions and workflow configuration depend on the implementation.Vendor-reported
|
| Human handoff | Five9 states that on escalation "full conversation context transfers instantly to a live agent," and CX Today reported configurable guardrails that route conversations to a human when required.Vendor-reported
| The SDK documents routing to a team member with an automatic conversation summary.Vendor-reported
|
| Target customer size | Five9 sells its bundles with "a minimum of 50 seats," positioning the AI agent capability at mid-market and enterprise contact centres rather than small teams.Vendor-reported
| Sierra’s public customer examples include AOL, Minted and Ramp. These show deployments in established businesses; they do not define a minimum viable team size.Vendor-reported
|
| Vendor-reported performance claims | Unknown | Sierra reports 90% case resolution at Ramp. This is a vendor-published customer result with no common benchmark population supplied here; it should not be compared directly with another vendor’s deflection or resolution figure.Vendor-reported
|
| Workflow evidenceBilling Illustrative scenario I was charged twice for the same order. Can you refund the extra payment? What to verify: Verify identity, inspect payment records, apply the refund policy, and confirm the payment-system result. If no authorized refund action is connected, hand off with the evidence. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Vendor-documented Illustrative evaluation: ask why a subscription charge increased, then request a card update. Verify identity checks, the source of the billing explanation and the permitted update path. 1 cited claim for billing on SierraSierra’s AOL case study describes explanations of outstanding balances, billing history and payment-method updates. The example is AOL’s configured agent, not a guarantee that every Sierra deployment includes billing access.Vendor-reported
|
| Workflow evidenceOrders Illustrative scenario My order has not arrived. Where is it? What to verify: Retrieve the correct order and current carrier status. Distinguish a real tracking update from an estimate; do not invent a delivery date. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Vendor-documented Illustrative evaluation: use a split shipment with one delayed item. Require the agent to distinguish production status from carrier status and avoid promising a delivery date that the connected system does not provide. 1 cited claim for orders on SierraSierra’s Minted case study describes order updates across design approval, printing and shipping, plus priority-shipping changes for delayed orders. This supports an order-management use case in that deployment.Vendor-reported
|
| Workflow evidenceReturns Illustrative scenario I bought this 12 days ago and opened the box. Can I return it? What to verify: Check the actual return window, product exclusions, and order record. A policy answer and an executed return are different capabilities. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Vendor-documented Illustrative evaluation: request an exchange for an item outside the normal return window. Check the configured exception policy, approval requirement and final state in the order system. 1 cited claim for returns on SierraSierra’s retail page lists refund requests and exchanges among supported workflows. It does not specify a universal return-policy configuration or prove that a particular refund reaches the payment processor.Vendor-reported
|
| Workflow evidenceProduct questions Illustrative scenario Does this adapter work with my exact laptop model? What to verify: Use a current, approved compatibility source. Ask for the model when missing and distinguish documented compatibility from an assumption. | External report Five9 states that AI Knowledge lets teams "effortlessly upload knowledge articles, FAQ documents, and product information" and delivers contextually relevant answers directly to the customer. 2 cited claims for product questions on Five9Five9 states that AI Knowledge lets teams "effortlessly upload knowledge articles, FAQ documents, and product information" and delivers contextually relevant answers directly to the customer.Vendor-reported
CX Today reported that Five9's AI Agents use generative AI to "deliver contextual answers to queries without prior training" by drawing on trusted knowledge sources.Independent report
| Vendor-documented Illustrative evaluation: ask whether an accessory works with an older product model. Supply an approved compatibility source and check that missing information leads to clarification rather than an invented answer. 1 cited claim for product questions on SierraSierra describes grounding answers in company knowledge, policies and brand guidance. That provides a route to product answers based on supplied content; it does not establish accuracy for a buyer’s catalog.Vendor-reported
|
| Workflow evidenceAccount issues Illustrative scenario I lost access to my email. Change the address on my account. What to verify: Follow the approved identity-recovery process before accessing or changing account data. Escalate when identity cannot be verified. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Vendor-documented Illustrative evaluation: an authenticated cardholder requests a replacement card and address change. Check permissions, address confirmation and the resulting card state before considering the journey complete. 1 cited claim for account issues on SierraSierra’s Ramp case study describes card locking and replacement, address validation and transaction explanations. These are account actions in Ramp’s configured implementation; password recovery and other account workflows require their own evidence.Vendor-reported
|
| Workflow evidenceComplaints Illustrative scenario I have contacted you three times and the problem is still unresolved. What to verify: Recognize the repeat complaint, retain relevant history, and route it to the right team. Do not promise compensation outside the policy. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Vendor-documented Illustrative evaluation: a customer repeats a cancellation request after rejecting a retention offer. Check that the configured flow respects the refusal and provides the agreed cancellation or human-escalation path. 1 cited claim for complaints on SierraSierra says its agents can recognize frustration and adapt their responses. This is a vendor claim about conversational behavior, not a measured result for complaint resolution or customer satisfaction.Vendor-reported
|
| Workflow evidenceHuman handoff Illustrative scenario Please connect me to a person who can approve this exception. What to verify: Transfer to an available team with the conversation and relevant records. Outside working hours, explain the actual follow-up path rather than promise immediate contact. | External report Five9 states that "when escalation is needed, full conversation context transfers instantly to a live agent, so customers never start over." 2 cited claims for human handoff on Five9Five9 states that "when escalation is needed, full conversation context transfers instantly to a live agent, so customers never start over."Vendor-reported
CX Today reported that with Five9 AI Agents, "contact centers can add guardrails to ensure these conversations still pass through to a live agent" when needed.Independent report
| Vendor-documented Illustrative evaluation: request a person during a failed account update. Check queue routing, transcript and summary delivery, plus what the customer sees when the team is offline. 1 cited claim for human handoff on SierraSierra’s SDK page documents routing an escalated conversation to a team member with a generated summary. It does not establish how quickly a human answers in a particular contact center.Vendor-reported
|
| Workflow evidenceSmall businesses Illustrative scenario A two-person support team wants to launch without a dedicated engineer. What to verify: Validate setup effort, existing help-desk support, required integrations, and ongoing maintenance. A small customer's story alone does not establish suitability for every small business. | Caveat documented The 50-seat minimum applies to the underlying platform bundles rather than to the AI agent add-on in isolation, but it is the entry condition for using the capability. 1 cited claim for small businesses on Five9Five9's pricing page states that its bundles are "per concurrent user and usage-based pricing may apply, with a minimum of 50 seats," with AI Agents sold as an add-on above that floor.Vendor-reported
| Not established Business size alone does not establish suitability. Illustrative buying scenario: a small team needs one FAQ channel; ask for the implementation work and ongoing maintenance required for that scope before deciding whether the platform is proportionate. No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Workflow evidenceMid-market Illustrative scenario A growing support team needs separate queues and connected order and account systems. What to verify: Validate routing, permissions, integration ownership, and handling of each team's policies in the intended configuration. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established The reviewed sources do not establish a universal mid-market fit. Illustrative buying scenario: a growing retailer needs order support across two brands; evaluate connector coverage, ownership of policy updates and support capacity for that deployment. No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Workflow evidenceEnterprise Illustrative scenario A multi-brand support organization needs controlled access across regional teams. What to verify: Validate data boundaries, audit records, escalation ownership, and the specific deployment requirements. A vendor's enterprise positioning is not proof of these controls. | External report Five9 positions AI Agents for enterprises, stating customers "deploy at enterprise scale with multi-agent systems, fast natural-language design, and full lifecycle control on one platform." 2 cited claims for enterprise on Five9Five9 positions AI Agents for enterprises, stating customers "deploy at enterprise scale with multi-agent systems, fast natural-language design, and full lifecycle control on one platform."Vendor-reported
CX Today reported that Five9 launched its AI Agents alongside an observability and governance layer covering hallucination detection, prompt-injection detection and completeness scoring with human oversight retained.Independent report
| Vendor-documented Illustrative buying scenario: multiple business units need separate permissions and policies. Request a demonstration using those boundaries and review the operational and security requirements of the proposed deployment. 1 cited claim for enterprise on SierraSierra publishes customer stories for AOL, Minted and Ramp, including connected service workflows. These are vendor-published deployment examples, not proof that every enterprise requirement is met.Vendor-reported
|
| Industry evidenceRetail and e-commerce | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Vendor-documented Sierra's retail and consumer goods page lists refunds and exchanges among supported workflows. Vendor documentation only; no retail deployment is independently reported. 1 cited claim for retail and e-commerce on SierraSierra’s retail page lists refund requests and exchanges among supported workflows. It does not specify a universal return-policy configuration or prove that a particular refund reaches the payment processor.Vendor-reported
|
| Industry evidenceFinancial services | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Industry evidenceTelecommunications | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Industry evidenceTravel and hospitality | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Industry evidenceHealthcare | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Industry evidencePublic sector and education | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Industry evidenceLogistics and delivery | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Channels | ||
| Web and in-app chat | Vendor-documented Five9 markets both "Voice AI Agents" for automating routine customer interactions and "Digital AI Agents" providing personalized self-service via chatbots and social messaging. 1 cited claim for web and in-app chat on Five9Five9 markets both "Voice AI Agents" for automating routine customer interactions and "Digital AI Agents" providing personalized self-service via chatbots and social messaging.Vendor-reported
| Vendor-documented Vendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT. 1 cited claim for web and in-app chat on SierraVendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT.Vendor-reported
|
| Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Vendor-documented Vendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT. 1 cited claim for email on SierraVendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT.Vendor-reported
| |
| Voice and phone | Vendor-documented Five9 markets both "Voice AI Agents" for automating routine customer interactions and "Digital AI Agents" providing personalized self-service via chatbots and social messaging. 1 cited claim for voice and phone on Five9Five9 markets both "Voice AI Agents" for automating routine customer interactions and "Digital AI Agents" providing personalized self-service via chatbots and social messaging.Vendor-reported
| Vendor-documented Vendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT. 1 cited claim for voice and phone on SierraVendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT.Vendor-reported
|
| SMS | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Vendor-documented Vendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT. 1 cited claim for sms on SierraVendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT.Vendor-reported
|
| Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Vendor-documented Vendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT. 1 cited claim for whatsapp on SierraVendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT.Vendor-reported
| |
| Social messaging | Vendor-documented Five9 markets both "Voice AI Agents" for automating routine customer interactions and "Digital AI Agents" providing personalized self-service via chatbots and social messaging. 1 cited claim for social messaging on Five9Five9 markets both "Voice AI Agents" for automating routine customer interactions and "Digital AI Agents" providing personalized self-service via chatbots and social messaging.Vendor-reported
| Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Help desks | ||
| Zendesk | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Salesforce | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| ServiceNow | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Freshdesk | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Intercom | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| HubSpot | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Kustomer | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Gorgias | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Gladly | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Help Scout | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Front | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
| Microsoft Dynamics 365 | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. | Not established No supporting source is recorded here. Validate it with the vendor; absence of evidence does not establish a missing capability. |
Change history
Open the changelogEvery change to this record is in the public changelog, with what it changed and why.
· Structure
Channels and help desks become evidence rows, and records gain bylines
Five9: 3 evidence states moved
- Channel · Web and in-app chatNot established→Vendor-documented
- Channel · Voice and phoneNot established→Vendor-documented
- Channel · Social messagingNot established→Vendor-documented
Sierra: 5 evidence states moved
- Channel · Web and in-app chatNot established→Vendor-documented
- Channel · EmailNot established→Vendor-documented
- Channel · Voice and phoneNot established→Vendor-documented
- Channel · SMSNot established→Vendor-documented
- Channel · WhatsAppNot established→Vendor-documented
· Catalog
Launch: 22 AI customer service agents and 532 claims, every one sourced and dated
Five9: Added to the catalog with 23 claims and 4 rows with evidence.
Sierra: Added to the catalog with 23 claims and 9 rows with evidence.
Recorded before launch
Notes the profile carried when it went live, from research before launch.
Sierra: Added editorial product positioning with its scope, rationale, and vendor source. Source
Sierra: Rechecked public sources; replaced broad fit verdict evidence with specific deployment examples and evaluation conditions. Removed unverified attribution, relayed marketing treated as independent confirmation, and business-size exclusions without evidence.