Sierra

Sierra builds and operates customer-facing AI agents that handle support and service conversations across chat, voice, email, and SMS, plus a "Live Assist" mode that surfaces agent-drafted responses to human reps instead of replacing them. Non-technical teams configure agents in Agent Studio (journeys, knowledge sources, brand voice, 40+ prebuilt integrations, no code); engineering teams use the Agent SDK to declare goals, guardrails, and composable skills in code, with simulation-based regression testing before release. Insights and Monitors add reporting, conversation tagging, and observability into what the agent did and why. A newer product, Horizon, extends this from single conversations into multi-day, outcome-driven follow-through (e.g., chasing down a denied prior-authorization and rebooking a patient over several calls) — this is a distinct, more ambitious claim than typical support-chatbot vendors make, and it's recent enough (launched 2026) that independent evidence of it working at scale is thin.

Sierra's trust center (trust.sierra.ai) lists SOC 2 Type II, HIPAA, PCI DSS 4.0.1, GDPR, CCPA, CSA STAR, ISO 27001:2022, ISO 42001:2023, FedRAMP High, and the AIUC-1 AI-agent safety framework, each with a linked report or artifact rather than a bare logo. That FedRAMP High and full PCI DSS Level 1 certification (payment data isolated on separate infrastructure, per Sierra) is a materially deeper compliance stack than most customer-service-AI vendors carry, and it shows in the customer base: SoFi and Chime (regulated financial services) and Paychex (payroll) cite this specifically as a reason they chose Sierra over alternatives. The subprocessor list (AWS, Anthropic, Google, Microsoft Azure, plus Baseten/Fireworks/Together/Modal for inference) is published and dated, which is unusual transparency for this category.

Sierra's own /customers pages (verified 2026-10-01) name CLEAR, Wayfair, SoFi, Chime, Casper, Minted, ADT, Paychex, Rocket Mortgage, Redfin, CarMax, GoFundMe, and others, each with a named customer contact and a specific metric: SoFi reports 61% chat containment and a 33-point NPS improvement three months post-launch; Casper reports a 74% resolution rate during a peak sale and a >20% CSAT increase; Rocket Mortgage reports 400,000+ chat conversations and conversion rates 3-4x higher for users of its AI assistant versus those who don't use it; ADT reports 1.2 million customer inquiries per month. These are vendor-published case studies, not independently audited, and the metrics are the ones Sierra chose to publish — there's no aggregated, cross-customer benchmark (e.g., average resolution rate) available anywhere. SiriusXM, the figure our previous listing led with, is a real but older case study (published Feb 2024) that gives no subscriber or inquiry-volume figure on Sierra's own page; the "34 million subscribers" number in our prior copy did not trace to anything Sierra currently publishes about that account and has been dropped.

Sierra has no public pricing page. Every product and customer-story page ends in a "Learn more" / "Get started" link to a sales form, and the trust center, docs, and blog all point the same way. Public reporting and the company's own positioning (outcomes-based pricing, mentioned on the Context Engine and Horizon pages — "you pay for results, not tokens") suggest a custom, usage- or outcome-based commercial model rather than seat- or message-based tiers, but no rate card, minimum contract size, or self-serve tier is published anywhere we could find. Buyers should expect an enterprise sales cycle before getting a number.

We found no independent review aggregator data (G2 and Trustpilot both blocked automated access at the time of this check) and no third-party benchmark of resolution rate, CSAT, or cost-per-conversation across Sierra's customer base — every performance number on this page comes from a Sierra-published case study naming one customer at one point in time. Company funding, valuation, and headcount are not published on sierra.ai and were not independently verified in this pass.