Sierra

Sierra publishes dozens of production customer stories across retail, finance, healthcare, telecom, travel and technology, including Wayfair, SoFi, Redfin, CLEAR, SiriusXM and others.

Sierra publishes dozens of production customer stories across retail, finance, healthcare, telecom, travel and technology, including Wayfair, SoFi, Redfin, CLEAR, SiriusXM and others.

Sierra reported hundreds of enterprise customers only 18 months after launch; more than 20% of customers have over $10B in revenue, and Sierra agents reach hundreds of millions of people across retail, healthcare, financial services and other industries.

Sierra reported hundreds of enterprise customers only 18 months after launch; more than 20% of customers have over $10B in revenue, and Sierra agents reach hundreds of millions of people across retail, healthcare, financial services and other industries.

Sierra develops enterprise customer agents across chat, voice, email, SMS, WhatsApp and ChatGPT with multimodal workflows and long-horizon agent runtime capabilities.

Sierra develops enterprise customer agents across chat, voice, email, SMS, WhatsApp and ChatGPT with multimodal workflows and long-horizon agent runtime capabilities.

Sierra’s Agent OS uses a constellation of 15+ frontier, open-weight and proprietary models, decomposing agent behavior into modular tasks with automatic orchestration and routing, task-specific evaluation and fine-tuned models where off-the-shelf systems fail constraints.

Sierra has expanded globally across North America, Europe and Asia and continues to broaden its agent platform through acquisitions and enterprise deployments.

Sierra has expanded globally across North America, Europe and Asia and continues to broaden its agent platform through acquisitions and enterprise deployments.

Sierra raised $950M in May 2026 at a valuation above $15B and reported serving more than 40% of the Fortune 50, with agents on its platform powering billions of customer interactions across major industries.

Sierra documents turning annotated customer conversations into simulated regression tests against mock APIs, run in parallel before agent releases and during platform upgrades. This concrete testing lifecycle supports portable agent evaluation and software quality skills.

Agent orchestration, enterprise integrations and multi-channel automation skills transfer broadly across applied AI, though customer-experience specialization limits full portability.

Agent orchestration, enterprise integrations and multi-channel automation skills transfer broadly across applied AI, though customer-experience specialization limits full portability.