Sierra

At Sierra, we build agents using goals and guardrails so they can think and reason independently, whether originating a mortgage, disputing a charge, or helping select the right pair of skis. That freedom is what makes them so powerful — and the guardrails they are given so important.

With Sierra’s long-running Horizon agents, insurers can now proactively engage every prospective customer over days, weeks, or months — staying with them until they buy or move on.

Agents built on Sierra can now navigate the most challenging IVR systems out of the box: they understand when to call, how to get through a multi-level menu, when to stay silent, and how to recognize when they’ve reached a person.

What an agent does and how it expresses itself are two different things. Today, we’re launching Voice Personas so you can design both.

Quarterly Report filed 2026-08-07

Material Event filed 2026-08-05

Meet Context Engine, which turns what a business knows into decisions an agent can act on when an outcome is on the line. It’s what enables long-running Horizon agents that can pursue business outcomes over days, weeks or months, with every interaction making the next one a little smarter so that your competitive advantage compounds over time.

Through our partnership, customers can now securely connect their bank accounts with Plaid directly within Sierra’s agent.

The hardest part of building great agents isn't the model — it's everything around it. That’s where Agency comes in, the infrastructure that gives every Pinecone session and every task for Ghostwriter (our agent-building agent for customers) a secure place to live and run.

Since the beginning of this year, Takeoff has gone from $0 in ARR to nearly 8 figures of revenue as of earlier this month. We’re energized to have the opportunity to accelerate and scale our platform with Sierra’s partnership and trust around the world.

Sharing the biggest lessons we learned building Sierra’s MCP Gateway — and what it looks like to build software in an AI-first engineering organization.