Sierra

Sierra is an enterprise AI customer service platform co-founded in 2023 by Bret Taylor and Clay Bavor. Taylor is a former Salesforce co-CEO, co-creator of Google Maps, and OpenAI board chair, and Bavor is an 18-year Google veteran who led Google Labs, Lens, and Workspace. Sierra builds purpose-built conversational AI agents that handle complex, multi-turn customer service interactions autonomously across voice, chat, and digital channels. The agents connect directly to CRMs, order management systems, subscription platforms, and data warehouses to complete real actions rather than just answer questions. As of Q3 2026, Sierra has raised $1B+ in total funding at a $15.8B valuation and reports $150M+ ARR, with the first $50M quarter delivered in February 2026. Sierra serves 40% of the Fortune 50. Half of its customers have revenue exceeding $1B and one in four exceeds $10B. Deployed by ADT, SiriusXM, Sonos, WeightWatchers, Rocket Mortgage, SoFi, Casper, Chipotle, Prudential, Cigna, and Blue Cross Blue Shield. The $950M Series E round closed May 4, 2026, led by Tiger Global and GV, more than tripling Sierra's valuation from $4.5B just 18 months earlier. Ghostwriter, launched March 25, 2026, lets enterprise teams upload SOPs, call transcripts, whiteboard photos, or audio recordings, or describe a goal in plain English. It then produces a production-ready agent across voice, chat, and email in 30+ languages without requiring engineering resources to configure from scratch. Native integrations include Salesforce, ServiceNow, and Zendesk, with custom API connectors for order management systems, subscription billing platforms, and data warehouses. Sierra does not publish a connector marketplace or pre-built integration library. Deployments outside the core Salesforce and ServiceNow stack require custom API work scoped during the implementation engagement. Sierra does not expose a general-purpose MCP server for teams building multi-agent orchestration layers, though since October 2025 customers can publish agents into ChatGPT through OpenAI's Apps SDK, which uses the Model Context Protocol. Pricing is outcome-based and fully custom: Sierra charges per resolved outcome rather than per seat or conversation. Year-one total costs are documented at $200K-$350K+ including platform licensing, implementation fees, and usage, with some enterprise deployments exceeding $1M annually at high resolution volumes. No pricing page is published; all commercial terms are negotiated directly. The outcome-based model aligns vendor incentives with resolution success but makes budget modeling difficult before a commercial discussion, since the definition of a resolved outcome and the per-outcome rate are both contract-negotiated terms. Not suitable for SMBs or mid-market teams given minimum commitment levels. Sierra requires dedicated engineering support to configure API connections and map complex customer workflows. Integration changes typically require Sierra's engineering team rather than self-service configuration, and implementation timelines of months are standard. For mid-market teams, Intercom Fin starts at $0.99 per resolution with faster self-serve deployment and a published connector library. Zendesk AI offers outcome-based pricing with a broader self-serve setup path. Teams that need rapid deployment or lack dedicated implementation resources should evaluate both before committing to Sierra's sales process. Current state Q3 2026: Sierra closed a $950M Series E at a $15.8B valuation on May 4, 2026, led by Tiger Global and GV. Sierra achieved FedRAMP High certification on June 10, 2026, the federal security standard for cloud companies working with U.S. government agencies. This adds to an already comprehensive compliance posture: SOC 2 Type II, ISO 27001, ISO 42001, HIPAA, GDPR, and CCPA, plus CSA STAR and PCI DSS 4.0.1. Sierra opened a Toronto office in May 2026 with about a dozen employees and a growing Canadian customer base. Sierra does not expose a general-purpose MCP server, though since October 2025 customers can publish agents into ChatGPT via OpenAI's Apps SDK, which uses the Model Context Protocol. G2 shows 4.4 stars across 22 reviews, structurally low given the sales-led enterprise model where NDA constraints limit public review volume. Ghostwriter reached general availability in Q1 2026 and is the flagship Sierra product launch of the year. ARR crossed $150M in February 2026, which Sierra describes as one of the fastest trajectories in enterprise software history. On July 16, 2026, Sierra announced Horizon, a platform for long-horizon agents that pursue multi-step goals such as loan origination, prior authorization, or closing a sale over days to months, layering long-horizon planning and a context engine onto Agent OS and reinforcing the outcome-based model (customers pay for business outcomes, not tokens). On July 23, 2026, Sierra acquired Takeoff, a long-horizon agent runtime that grew from zero to a near-eight-figure run rate with a three-person team in 14 months; the combined teams are building Horizon.