--- pair: five9-vs-sierra page_url: https://ai-agent.review/compare/five9-vs-sierra record_url: https://ai-agent.review/compare/five9-vs-sierra.md agents: [five9, sierra] tested_performance: not-yet-tested facts_checked_at: 2026-09-20 --- # Five9 vs Sierra Comparing **Five9** (Five9, https://ai-agent.review/agents/five9.md) and **Sierra** (Sierra, https://ai-agent.review/agents/sierra.md). Source-based review. This portal has not run a hands-on benchmark, so nothing here reports observed performance. No record contains a score, a rating or a benchmark result, and none will until the agents have actually been tested. Facts last checked 20 Sept 2026, the earlier of the two records. ## Fit comparison Each state describes what the reviewed sources establish about a workflow, not whether the product is good at it. Vendor-documented means the vendor documents the workflow. External report means a source outside the vendor discusses it. Caveat documented means a cited source describes a limitation or failure in a specific context; read it alongside any capability evidence. Not established means the reviewed sources do not settle it, which is not the same as the product being unable to do it. States are derived from the cited claims below, never stored. | Area | Five9 | Sierra | | --- | --- | --- | | Billing | Not established | Vendor-documented | | Orders | Not established | Vendor-documented | | Returns | Not established | Vendor-documented | | Product questions | External report | Vendor-documented | | Account issues | Not established | Vendor-documented | | Complaints | Not established | Vendor-documented | | Human handoff | External report | Vendor-documented | | Small businesses | Caveat documented | Not established | | Mid-market | Not established | Not established | | Enterprise | External report | Vendor-documented | Evidence for each verdict is listed per agent below. ### Five9: fit evidence ### Billing — Not established No public source was found that settles this. ### Orders — Not established No public source was found that settles this. ### Returns — Not established No public source was found that settles this. ### Product questions — External report - **Vendor capability:** 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. _(Vendor-reported, checked 20 Sept 2026; source: [Five9 AI Knowledge](https://www.five9.com/products/capabilities/ai-knowledge); claim id: `five9-knowledge-answers`)_ - **Independent report:** 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, published 13 Nov 2024, checked 20 Sept 2026; source: [Five9 Co-Innovates with ServiceNow, Unveils Its AI Agents](https://www.cxtoday.com/contact-center/five9-co-innovates-with-servicenow-unveils-its-ai-agents/); claim id: `five9-untrained-answers`)_ ### Account issues — Not established No public source was found that settles this. ### Complaints — Not established No public source was found that settles this. ### Human handoff — External report - **Vendor capability:** Five9 states that "when escalation is needed, full conversation context transfers instantly to a live agent, so customers never start over." _(Vendor-reported, checked 20 Sept 2026; source: [Five9 AI Agents](https://www.five9.com/products/capabilities/ai-agents); claim id: `five9-handoff-context`)_ - **Independent report:** 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, published 13 Nov 2024, checked 20 Sept 2026; source: [Five9 Co-Innovates with ServiceNow, Unveils Its AI Agents](https://www.cxtoday.com/contact-center/five9-co-innovates-with-servicenow-unveils-its-ai-agents/); claim id: `five9-handoff-guardrails`)_ ### Small businesses — Caveat documented - **Documented gap:** Five9'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, checked 20 Sept 2026; source: [Five9 Pricing](https://www.five9.com/pricing); claim id: `five9-min-seats`)_ > 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. ### Mid-market — Not established No public source was found that settles this. ### Enterprise — External report - **Vendor capability:** 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." _(Vendor-reported, checked 20 Sept 2026; source: [Five9 AI Agents](https://www.five9.com/products/capabilities/ai-agents); claim id: `five9-enterprise-scale`)_ - **Independent report:** 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, published 19 Jun 2025, checked 20 Sept 2026; source: [Five9 Brings AI Agents to Market With a Shot of Trust and Governance: A Recap](https://www.cxtoday.com/contact-center/five9-brings-ai-agents-to-market-with-a-shot-of-trust-and-governance-a-recap/); claim id: `five9-governance-layer`)_ ### Sierra: fit evidence ### Billing — Vendor-documented - **Vendor capability:** Sierra’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, checked 20 Sept 2026; source: [AOL customer story (Sierra)](https://sierra.ai/customers/aol); claim id: `sierra-billing-aol`)_ > 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. ### Orders — Vendor-documented - **Vendor capability:** Sierra’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, checked 20 Sept 2026; source: [Minted customer story (Sierra)](https://sierra.ai/customers/minted); claim id: `sierra-orders-minted`)_ > 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. ### Returns — Vendor-documented - **Vendor capability:** Sierra’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, checked 20 Sept 2026; source: [Retail and consumer goods (Sierra)](https://sierra.ai/industries/retail); claim id: `sierra-returns-retail-exchanges`)_ > 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. ### Product questions — Vendor-documented - **Vendor capability:** Sierra 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, checked 20 Sept 2026; source: [Meet your agent (Sierra)](https://sierra.ai/product/meet-your-agent); claim id: `sierra-productq-meet-knowledge`)_ > 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. ### Account issues — Vendor-documented - **Vendor capability:** Sierra’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, checked 20 Sept 2026; source: [Ramp customer story (Sierra)](https://sierra.ai/customers/ramp); claim id: `sierra-account-ramp`)_ > 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. ### Complaints — Vendor-documented - **Vendor capability:** Sierra 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, checked 20 Sept 2026; source: [Meet your agent (Sierra)](https://sierra.ai/product/meet-your-agent); claim id: `sierra-complaints-meet-frustration`)_ > 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. ### Human handoff — Vendor-documented - **Vendor capability:** Sierra’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, checked 20 Sept 2026; source: [Agent SDK (Sierra)](https://sierra.ai/product/agent-sdk); claim id: `sierra-handoff-sdk`)_ > 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. ### Small businesses — Not established No public source was found that settles this. > 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. ### Mid-market — Not established No public source was found that settles this. > 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. ### Enterprise — Vendor-documented - **Vendor capability:** Sierra 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, checked 20 Sept 2026; source: [Customer stories and examples (Sierra)](https://sierra.ai/); claim id: `sierra-enterprise-vendor`)_ > 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. ## Product information | Attribute | Five9 | Sierra | | --- | --- | --- | | 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, checked 20 Sept 2026) | 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, checked 20 Sept 2026) | | 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, checked 20 Sept 2026) | 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, checked 20 Sept 2026) | | 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, checked 20 Sept 2026) | | 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, checked 20 Sept 2026) | 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, checked 20 Sept 2026) | | 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, checked 20 Sept 2026) | The SDK documents ingestion of company FAQs, policies and documentation into its knowledge engine. (Vendor-reported, checked 20 Sept 2026) | | 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, checked 20 Sept 2026) | 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, checked 20 Sept 2026) | | 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, checked 20 Sept 2026) | The SDK documents routing to a team member with an automatic conversation summary. (Vendor-reported, checked 20 Sept 2026) | | 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, checked 20 Sept 2026) | 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, checked 20 Sept 2026) | | 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, checked 20 Sept 2026) | Full source links for each attribute are in the per-agent records linked above. ## Industry comparison An industry state says where the cited sources place the product, not how well it performed there. The same four states and the same rubric apply. Industry entries cite claims published in the agent's own record, by id, so a source is never stored twice and the two copies can never disagree. An industry with no entry is unknown, which is a gap in the public record rather than a finding. | Industry | Five9 | Sierra | | --- | --- | --- | | Retail and e-commerce | Not established | Vendor-documented | | Financial services | Not established | Not established | | Telecommunications | Not established | Not established | | Travel and hospitality | Not established | Not established | | Healthcare | Not established | Not established | | Public sector and education | Not established | Not established | | Logistics and delivery | Not established | Not established | Evidence for each industry is listed per agent below. ### Five9: industry evidence ### Retail and e-commerce — Not established No reviewed source places this product in this industry. ### Financial services — Not established No reviewed source places this product in this industry. ### Telecommunications — Not established No reviewed source places this product in this industry. ### Travel and hospitality — Not established No reviewed source places this product in this industry. ### Healthcare — Not established No reviewed source places this product in this industry. ### Public sector and education — Not established No reviewed source places this product in this industry. ### Logistics and delivery — Not established No reviewed source places this product in this industry. ### Sierra: industry evidence ### Retail and e-commerce — Vendor-documented - Sierra’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, checked 20 Sept 2026; source: [Retail and consumer goods (Sierra)](https://sierra.ai/industries/retail); claim id: `sierra-returns-retail-exchanges`)_ > Sierra's retail and consumer goods page lists refunds and exchanges among supported workflows. Vendor documentation only; no retail deployment is independently reported. ### Financial services — Not established No reviewed source places this product in this industry. ### Telecommunications — Not established No reviewed source places this product in this industry. ### Travel and hospitality — Not established No reviewed source places this product in this industry. ### Healthcare — Not established No reviewed source places this product in this industry. ### Public sector and education — Not established No reviewed source places this product in this industry. ### Logistics and delivery — Not established No reviewed source places this product in this industry. ## Five9: evidence base The independent evidence behind these states comes mainly from analysts and trade press. Independent sources behind these verdicts: cxtoday.com. By kind: analysts and trade press (3). Verdicts across agents are not directly comparable while the evidence behind them comes from different kinds of source. See https://ai-agent.review/methodology#evidence-asymmetry. ## Sierra: evidence base No independent source has been found for any fit area, so every state here rests on vendor material or nothing. Independent sources behind these verdicts: none. Verdicts across agents are not directly comparable while the evidence behind them comes from different kinds of source. See https://ai-agent.review/methodology#evidence-asymmetry. ## Corrections Factual corrections with a public source are accepted at corrections@ai-agent.review and answered within 14 days. Method: https://ai-agent.review/methodology