Five9

Five9 is a cloud contact center platform, the Five9 Genius CX Platform, built around a simple promise: bring the right mix of people, AI, and systems to every interaction. It organizes the platform into three parts. Five9 Engage handles inbound and outbound requests across voice, web chat, SMS, email, WhatsApp, and video, with agentic AI and intelligent virtual agents resolving routine work instantly, day or night, and moving complex conversations to a live agent with context intact rather than a cold handoff. Five9 Orchestrate uses Genius AI routing to send each interaction down the right path and automates agentic workflows end to end, so AI agents, human agents, and connected systems move together as one journey. Five9 Optimize uses generative AI to score and coach on every interaction, surface trending topics across channels, and keep quality, journey, and number health metrics in one view, with built in forecasting and scheduling for the workforce. The AI agent story is concrete. Intelligent virtual agents provide self service across web, chatbot, voice, SMS, and WhatsApp, and Five9 says they can be integrated with an existing on premises contact center, so a business can start with cloud IVAs and migrate live agents later rather than ripping and replacing. Its AI Agents add on is described as agents that can reason, decide, and act while keeping the business in control, and Agent Assist supports human agents with real time transcription and call summarization. The homepage scale figures are the vendor's own: thousands of customers, billions of interactions handled annually, and an integration library it puts at more than 300 tools. Named customers on the homepage include Wyndham Hotels and Resorts, Omaha Steaks, Exact Sciences, Alaska Airlines, and Yopa, with stories covering automated reservations, seasonal scaling, patient scheduling, and automated outreach. Buyers can shape the deployment. CRM adapters are prebuilt for Salesforce, ServiceNow, Microsoft Dynamics, Zendesk, and Oracle, unified communications adapters cover Microsoft Teams, Zoom, and RingCentral, and workforce engagement management can come from Five9 itself or from its partners Verint and Calabrio. A long add on list covers analytics, secure payments, gamification, recording data protection for PCI and HIPAA compliance, and digital outreach that follows up failed calls by email, SMS, or social. Pricing is sold in five solution bundles: Digital, Core, Plus, Pro, and Enterprise. The first two bundles publish per seat monthly pricing on the pricing page, while the upper three are handled through sales with flexible pricing. Five9 notes that prices are per concurrent user, that usage based pricing may apply on top, that a minimum seat count applies, and that each bundle mixes channels, AI capabilities, CRM adapters, and a choice of workforce engagement tooling.

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Retell AI

Retell AI is an AI voice agent platform for contact centers, in production at more than 4,000 businesses according to its homepage. Its agents answer inbound calls and place outbound calls, qualify leads, book appointments, check order status, and route or transfer callers to a live agent when needed. Retell is built for real contact center demands such as transfers, phone trees, outbound volume, and back end systems that have to work on every call. Features include agentic warm transfers, where the agent briefs the receiving person before connecting the customer, IVR navigation through complex phone trees and extensions, and a mix of deterministic and generative responses so critical steps such as disclosures and verification follow exact requirements while the rest of the conversation stays natural. During a live call, Retell agents can execute custom logic, access real time data, and complete tasks across business systems, from booking appointments to updating records. Persistent memory keeps a running brief on every contact across calls and texts, so returning callers can pick up where they left off. The platform also offers burst concurrency, sentiment analysis, AI quality assurance, live monitoring, and a shared caller history that can sync with an existing CRM or run in Retell CRM. CX teams build agents in a no code studio while developers extend them with APIs and SDKs, and every call is transcribed for review. Retell cites response times around 600 milliseconds and compliance with HIPAA, SOC 2 Type II, GDPR, and ISO 27001, with SSO, personal information redaction, and role based access control. On its pricing page, Retell describes true pay as you go pricing for voice agents at $0.07 to $0.31 per minute depending on the models, voice, and add ons chosen, with enterprise pricing custom, no platform fee, and 20 concurrent calls included. New accounts receive $10 in free credits on signup according to the homepage.

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Vapi

Vapi is a platform for building advanced voice AI agents, aimed at builders who want to configure agents on their own terms. Its homepage tagline is voice agents for builders, with the promise that teams can build, deploy, and improve voice agents as fast as they ship. Vapi presents itself as one unified platform for all of a team's voice agents, combining orchestration, real time monitoring, and enterprise grade configurability built for scale. Builders configure everything from voice and conversation flow to telephony and integrations, while Vapi handles the infrastructure so a team can move from prompt to production fast, with build, test, and deploy described as taking minutes. Once agents are live, Vapi is built around continuous improvement. Teams can track what is working across every call, surface what is not, and keep improving the experiences that drive their business forward. The homepage reports scale figures of 1 billion calls supported, 2.5 million or more agents launched, and 1 million or more developers, with average latency under 500 milliseconds. A customer quote from Ring on the homepage says that customer went from zero to production in two weeks, that 100 percent of its inbound volume now runs through Vapi, and that customer satisfaction scores have improved while its high bar for support was maintained. For enterprises, Vapi lists a support SLA with contractual uptime and performance guarantees and reserved capacity sized to volume, dedicated deployment support with a dedicated engineer embedded in the team to get live in a week, and scalable infrastructure that can scale to millions of calls. Security and control features listed include SSO, OAuth, and role based access control, AI guardrails built in to prevent model hallucinations and ensure data integrity, and compliance described as SOC 2, HIPAA, and PCI compliant, with 99.9 percent uptime stated for enterprise clients.