The Sierra blog

4 September 2025

There's an agent for that, and it runs on Sierra

Today, we’re announcing that we’ve raised $350M additional capital at a valuation of $10B, led by Greenoaks, which is doubling down on Sierra.

11 September 2025

Voice Sims: test agents in real world conditions before they talk to your customers

Sierra's Voice Sims is a pioneering feature that tests voice agents in real world conditions before they talk to a single customer.

2 September 2025

Calling new grads: APX year 2

Are you a college senior or recent graduate? If you’re driven to turn AI theory into practice, make an impact, and learn from some of the best in our industry, we’d love to build with you.

Gradient background with graduation cap icon

Fast to build, faster to impact

With Sierra’s Agent OS, companies across industries are launching agents in weeks that scale globally, improve continuously, and deliver more human customer experiences from day one.

2 September 2025

Change agents: Brex

By building its customer agent with Sierra, Brex has accelerated service by 90%, saved customers over 15,000 hours a year, and empowered both technical and non-technical teams to scale AI across the business.

19 August 2025

Five ways to use AI agents: healthcare

In the year since Sierra’s launch, we’ve seen how AI can help deliver better, more human care while also reducing costs for the industry.

16 June 2025

Change agents: Minted

Since we first started working together last year, AI has become central to Minted’s long-term innovation strategy—with information from AI conversations helping to inform their marketing, engineering, and product teams, as well as solving real customer needs with care and creativity.

24 April 2025

Lasting relationships: AI agents drive customer retention

By building stronger relationships between companies and consumers, AI agents can help reduce churn—transforming customer service from a cost center into a revenue-generating function.

17 April 2025

What is an AI agent? And why does my business need one?

Agents are software that can complete tasks on their own, without supervision, just like a human. And AI agents solve the age-old tension between better experiences and higher costs—so you can serve more customers, more often, and in more meaningful ways.

1 April 2025

See what Sierra can do for you.

Find out how Sierra can help your business build better, more human customer experiences with AI.

Learn more