# Sierra Enterprise AI agents for customer service that take real actions ## About Sierra Sierra builds enterprise-grade AI customer service agents using a multi-model "constellation" architecture for companies like SiriusXM, WeightWatchers, and Sonos. Unlike Sierra with 3-6 month implementations and $150K+ annual contracts, Sistava offers pre-built AI employees from a marketplace that handle support plus sales, marketing, and ops, with transparent pricing starting free. ## Platform details - Pricing: Enterprise only. Outcome-based. Reported six-figure setup fees and annual contracts (per public reports). - Founded: 2023, San Francisco (co-founded by ex-Salesforce CEO Bret Taylor) - Funding: Reportedly $635M raised at a $10B valuation (Sep 2025, per public reports). - Last reviewed: 2026-03-22 ## Official website - [Visit Sierra](https://sierra.ai) ## What does Sierra AI actually do for enterprise customer experience? Sierra is an enterprise grade Agent Operating System for customer experience. It lets large companies build, deploy, and optimize AI agents across chat, voice, SMS, WhatsApp, email, and ChatGPT plugins, with deep CRM, order management, and data warehouse integrations behind them. The agents can take real actions like processing returns, updating subscriptions, and handling multi step workflows, not just answer FAQs. Agent Studio is the no code surface where CX teams build the workflows, configure knowledge, define brand voice, and manage version control. Ghostwriter, launched March 2026, generates production ready agents from SOPs, call transcripts, audio recordings, and even whiteboard photos, which dramatically shortens deployment time for new use cases. Sierra is built for scale that most companies do not reach. 40% of Fortune 50 companies are customers and one in four of those generate over $10 billion in annual revenue. For startups and mid market teams the same job is done by lighter weight workforce platforms like Sistava where an AI support employee can be hired without a six figure contract. ## How much does Sierra AI cost and what do you get? Sierra uses outcome based pricing where you pay when the AI agent achieves a successful outcome like a resolved conversation, a saved cancellation, or an upsell. Unresolved conversations typically do not bill. All contracts are custom quoted through sales, and there is no public pricing page. Public estimates put entry contracts at $150,000 per year, with large deployments hitting $1.5 million or more. What you get at that price is white glove enterprise engagement, deep integrations across your tech stack, the Agent Studio build surface, omnichannel deployment, and access to the latest tooling like Ghostwriter. Sierra is positioned as a strategic platform investment, not a per seat SaaS purchase. For founders comparing options, the math is straightforward. Sierra is the right shape if you already have million dollar customer support budgets and want to redirect that spend into AI. Sistava is the right shape if you want an AI support employee that you can hire today, expand later, and pay in a predictable subscription instead of a custom contract. ## When does Sierra AI beat the alternatives? Sierra beats every other option when the customer has complex enterprise workflows that need to mutate real systems. Returns that touch order management, subscription changes that touch billing, and cancellations that need retention logic are exactly where Sierra has invested. The combination of deep integrations and outcome based pricing makes the buying conversation align with CFO expectations. It also beats simpler chatbots on voice. Many AI agent platforms are still chat first with voice bolted on. Sierra supports voice as a first class channel alongside chat, SMS, WhatsApp, and email, which matters for industries where customers still prefer to call. Ghostwriter accelerates building these agents from existing call transcripts and SOPs rather than starting from scratch. For the segment Sierra targets, this is the strongest offering in the market. Outside that segment, a workforce model like Sistava gives smaller companies access to AI customer support employees without the enterprise procurement cycle. ## Where does Sierra AI fall short for smaller teams? The pricing alone disqualifies most small and mid market teams. With entry points around $150,000 per year and no published per resolution rate, Sierra is structurally aimed at companies that already spend seven figures on customer support headcount. For a startup with a five person team, the contract value plus implementation effort is wildly out of proportion to the support volume. Implementation also takes real time. Even with Ghostwriter speeding up agent creation, the full deployment of integrations, brand voice, governance, and rollout is a strategic project that runs months, not weeks. Smaller teams need value within days, not a quarterly milestone plan. This is where Sistava plays a different game. An AI support employee can be hired in minutes, trained on your help center and product docs, and start handling tickets the same day. The ceiling is lower than Sierra at the very top of the enterprise market, but the floor is dramatically more accessible for the companies actually trying to add their first AI teammate. ## How does Sierra AI handle integrations and real actions? Sierra integrates with CRMs, order management systems, subscription platforms, data warehouses, and helpdesks via APIs, and is built so that agents can take real actions inside those systems rather than just answering questions. A Sierra agent can process a return, update a subscription, cancel a plan with retention logic, and create or update CRM records during the conversation. Agent Studio gives CX teams a no code way to define these actions, version them, and roll out changes with audit trails. The platform includes guardrails for sensitive operations and pre built integration libraries, so a CX team can extend an agent without engineering bottlenecks. Ghostwriter further compresses the build step by reading SOPs and producing the action flows automatically. The integration story is one of the strongest in the category. For teams that need that depth at startup or mid market scale, Sistava AI support employees expose connected tools for helpdesks, CRMs, and product systems out of the box, which covers the most common real action surfaces without an enterprise contract. ## Comparison - [Compare Sierra with Sistava](/en/compare/ai-support/sierra) — See the two platforms side by side when you are ready to evaluate them.