aid: sierra-ai name: Sierra description: >- Sierra is a conversational AI platform for customer experience, founded in 2023 by Bret Taylor (former co-CEO of Salesforce, CTO of Facebook, co-creator of Google Maps, and current chair of OpenAI's board) and Clay Bavor (former Google VP who led Labs, Project Starline, Google Lens, and Google Workspace). Headquartered in New York with offices in San Francisco, Atlanta, London, Paris, Madrid, Toronto, Singapore, and Tokyo, Sierra builds branded AI agents that handle customer service, sales, and operational interactions across chat, voice, SMS, WhatsApp, email, and ChatGPT for enterprises including SiriusXM, WeightWatchers, Sonos, ADT, Chime, Sutter Health, Rocket Mortgage, Ramp, Brex, SoFi, Casper, CLEAR, Vivid Seats, Wayfair, AOL, and approximately 40% of the Fortune 50. The platform is anchored by Agent OS 2.0, with Agent Studio (no-code builder for CX teams), Agent SDK (a developer-facing programmatic layer that lets engineering teams write customer journeys as code), Agent Data Platform (persistent cross-session memory unifying structured CRM data and unstructured conversation history), Insights (analytics — Explorer, Monitors, Experiments, Observability), Live Assist (human-in-the-loop), Voice (real-time voice agents), and Ghostwriter (an agent-building agent that generates production-ready multilingual agents from SOPs, transcripts, audio recordings, whiteboard photos, or plain English in 30+ languages). Sierra runs an outcome-based pricing model — customers pay per resolved case, not per seat or per token — and operates a gated developer documentation portal at docs.sierra.ai available only to contracted customers. There is no public REST API, no public Agent SDK package, no public GitHub org, and no self-serve sign-up; access is via enterprise sales. Sierra raised $950M at a $15.8B valuation in May 2026 (after a $350M round at $10B earlier in the year) and reported $150M ARR within roughly two years of public launch. Sierra also acquired the French agent-evaluation startup Fragment in April 2026 and publishes the public τ-bench, τ-voice, and τ-knowledge benchmarks for evaluating agentic systems. type: Index position: Provider access: 3rd-Party image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg tags: - AI - Artificial Intelligence - Conversational AI - Customer Experience - Customer Service - Agents - AI Agents - Voice - Contact Center - Enterprise - Outcome-Based Pricing - Agent OS - Agent SDK - Ghostwriter - Bret Taylor url: https://raw.githubusercontent.com/api-evangelist/sierra-ai/refs/heads/main/apis.yml created: '2026-05-24' modified: '2026-05-24' specificationVersion: '0.20' apis: [] common: - type: TrustCenter url: security/sierra-ai-trust-center.yml - type: VulnerabilityDisclosure url: security/sierra-ai-vulnerability-disclosure.yml - type: DomainSecurity url: security/sierra-ai-domain-security.yml - type: Website url: https://sierra.ai - type: Portal url: https://sierra.ai - type: Documentation url: https://docs.sierra.ai - type: Pricing url: https://sierra.ai/pricing - type: Customers url: https://sierra.ai/customers - type: Blog url: https://sierra.ai/blog - type: Resources url: https://sierra.ai/resources - type: Careers url: https://sierra.ai/careers - type: Contact url: https://sierra.ai/contact - type: TrustCenter url: https://trust.sierra.ai - type: Events url: https://sierra.ai/summit - type: LinkedIn url: https://www.linkedin.com/company/sierra-ai - type: X url: https://twitter.com/sierraplatform - type: Features data: - name: Agent OS 2.0 description: >- Multi-channel agent operating system spanning chat, voice, email, SMS, WhatsApp, ChatGPT, and contact-center integrations with shared memory, learning, and live human assist. - name: Agent Studio description: >- No-code builder for CX teams to design agents using natural-language instructions and a collaborative workspace with simulations and guardrails. - name: Agent SDK description: >- Developer-facing programmatic layer that lets engineering teams write customer journeys as code, version them in their existing source control, and orchestrate composable skills and multi-step workflows. - name: Agent Data Platform description: >- Persistent agent memory unifying structured customer data (CRM, billing) with unstructured conversation history to enable personalized, relationship-aware responses across sessions. - name: Insights description: >- Analytics suite — Explorer (deep-research style conversation analysis), Monitors, Experiments, and Observability — for measuring and improving agent performance. - name: Live Assist description: >- Human-in-the-loop interface that surfaces real-time answers and captures conversation details to augment human agents. - name: Voice description: >- Real-time voice agents benchmarked publicly via Sierra's τ-voice benchmark; deployable into contact centers and IVR replacements. - name: Ghostwriter description: >- Agent-building agent that ingests SOPs, support transcripts, whiteboard photos, audio recordings, and plain-English descriptions to generate production-ready agents across voice, chat, and email in 30+ languages. - name: Trust and Reliability description: >- Built-in guardrails, evaluations, simulations, and observability targeted at regulated industries (financial services, healthcare, telecom). - name: Outcome-Based Pricing description: >- Customers pay per resolved case (outcome) rather than per seat or per token, aligning Sierra's revenue with measurable customer outcomes. - type: UseCases data: - name: Customer Service Automation description: >- Branded AI agents handle Tier-1 support across chat, voice, SMS, and email — Chime, Ramp, Wilson, and Pendulum report case resolution rates of 70–90%. - name: Voice / IVR Replacement description: >- Real-time voice agents replace traditional IVR menus for providers such as R1 RCM, Singtel, and ADT, which handles ~2M monthly inquiries. - name: Sales and Conversion description: >- Conversational agents drive product discovery and conversion (Rocket Mortgage 4× conversion, Sun & Ski 3× conversion, Redfin 2× listing views). - name: Healthcare Member Support description: >- HIPAA-compliant agents for chronic care management, member enrollment, and patient navigation (Sutter Health, Cigna, WeightWatchers). - name: Financial Services description: >- Agents for fintech onboarding, account servicing, and dispute resolution (SoFi +33 NPS, Chime 70%+ resolution, Brex 90% faster). - name: Retail and E-Commerce description: >- Order tracking, returns, sizing, and personalization across brands like Casper, Minted, ThirdLove, BARK, Chubbies, and Sonos. - name: Subscription and Media description: >- Subscriber retention and support for SiriusXM (34M subscribers), AOL, Tubi, and WeightWatchers. - name: Telecom description: >- Plan changes, troubleshooting, and billing for Singtel and Next. - name: Multi-Brand Agent Hosting description: >- Single agent runtime serving multiple brands under one customer (e.g., Imprint). - type: Integrations data: - name: ChatGPT description: >- One-click publish of a Sierra agent into the ChatGPT app directory, extending brand reach inside OpenAI's consumer surface. - name: WhatsApp description: >- Native deployment of Sierra agents on the WhatsApp Business channel. - name: SMS description: >- Outbound and inbound SMS agent channels. - name: Email description: >- Email-as-a-channel for ticket-grade asynchronous interactions. - name: Contact Center Platforms description: >- Integrations into existing CCaaS deployments for live-assist and voice handoff. - name: CRM and Billing Systems description: >- Agent Data Platform ingests structured customer records from existing CRMs and billing engines. - name: Custom Backends description: >- Agent SDK lets teams call any internal or external system from within an agent workflow. - type: Solutions data: - name: Financial Services description: >- Vertical solution for banks, fintechs, and lenders with compliance tooling and case templates. - name: Healthcare description: >- HIPAA-aligned deployments for payers, providers, and digital health. - name: Telecommunications description: >- Carrier-grade agents for plan changes, troubleshooting, and retention. - name: Media and Subscriptions description: >- Subscription lifecycle and content support. - name: Travel and Hospitality description: >- Booking, itinerary changes, and concierge experiences (Woodside Collection). - name: Retail description: >- Pre-purchase, post-purchase, and loyalty agents. - name: Technology description: >- Developer tools and SaaS support workflows. - type: Compliance data: - name: SOC 2 description: SOC 2 Type II audited. - name: ISO 27001 description: ISO 27001 certified information security management. - name: ISO 42001 description: >- ISO 42001 certified — the AI management system standard, signaling governed AI operations. - name: HIPAA description: HIPAA-compliant deployments for healthcare customers. - name: GDPR description: GDPR-compliant data handling for EU customers. - name: EU AI Act description: Aligned with EU AI Act obligations for high-risk AI systems. maintainers: - FN: Kin Lane email: kin@apievangelist.com