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AI Agents & Chatbots Enterprise Voice & Phone AI

AI agent mirrors the nuances of human communication, ensuring seamless and organic customer service interactions while improving customer satisfaction.

Pricing

Per resolution from Custom

Founded

2023

Channels

Chat, Email, Voice, SMS, WhatsApp

Compliance

SOC 2 HIPAA GDPR ISO 27001 ISO 42001 PCI DSS FedRAMP EU AI Act

Integrations

Salesforce Zendesk Shopify Twilio Stripe Snowflake

Sierra builds conversational AI agents for the enterprise, and it arrived with about as much star power as a startup can carry. It was founded in 2023 by Bret Taylor and Clay Bavor, and if those names ring a bell it is because Taylor co-created Google Maps, served as CTO of Facebook and co-CEO of Salesforce, and currently chairs the board of OpenAI, while Bavor spent eighteen years at Google leading its virtual and augmented reality work. Company lore says the whole thing was hatched over a grilled branzino lunch in Palo Alto.

The product lives up to the pedigree. From a single build, Sierra deploys a branded agent across chat, voice, email, SMS, and even ChatGPT, following your policies, adopting your brand's voice, and escalating gracefully when a conversation gets thorny. Its voice agents are a standout: they hold natural, low-latency conversations, read sentiment, and can even take a credit card or ACH payment over the phone in one uninterrupted call, with no clumsy handoff to a separate system.

Under the hood sits Agent OS, a platform for building, testing, and supervising agents, with tooling to run voice simulations and rehearse behavior before anything reaches a real customer. Pricing is outcome-based, tied to conversations or successful resolutions and wrapped in multi-year enterprise contracts, so Sierra is aimed at large brands rather than weekend experimenters. Reported customers include SoFi, Ramp, and Brex, and the company says its agents already serve a meaningful slice of the Fortune 50.

Sierra's fundraising has kept pace with its towering ambition, vaulting the company into the rarefied tier of the most valuable AI startups in barely two years. For enterprises that want polished, on-brand agents across every channel and are willing to invest the time and budget to do it properly, Sierra is a genuine marquee choice.

Key features

• Outcome-based AI agents
• Voice and chat resolution
• Takes actions in your systems
• Follows your policies and guardrails
• Supervision and analytics

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Frequently asked questions

How much does Sierra AI cost?

Sierra AI uses per-resolution pricing: you pay for each conversation the AI resolves, not per seat. The vendor does not publish prices, so expect a custom quote from sales. Compare pricing across all listed tools →

What does Sierra AI integrate with?

Sierra AI integrates with Salesforce, Zendesk, Shopify, Twilio, Stripe, and Snowflake.

What compliance standards does Sierra AI meet?

Based on the vendor's own security and trust pages, Sierra AI claims SOC 2, HIPAA, GDPR, ISO 27001, ISO 42001, PCI DSS, FedRAMP, and EU AI Act compliance. See how that compares across vendors →

Is Sierra AI HIPAA compliant?

Yes. The vendor advertises HIPAA compliance for Sierra AI on its own site. Confirm the specifics, such as whether a business associate agreement (BAA) is offered, with the vendor before you buy.

Which support channels does Sierra AI cover?

Sierra AI handles customer conversations over chat, email, voice, SMS, and WhatsApp.

When was Sierra AI founded?

Sierra AI was founded in 2023.

What are the best Sierra AI alternatives?

Popular alternatives include boost.ai, Cognigy, and Kore.ai. See all Sierra AI alternatives →

Updated July 2026

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