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.

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.

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.

What languages does Sierra AI support?

Sierra AI supports 59 languages.

Can Sierra AI take actions, or does it only answer questions?

Sierra AI can take actions in connected systems, not just answer questions, including refunds & returns.

What are the best Sierra AI alternatives?

Popular alternatives include Auto-Respond, boost.ai, and Cognigy.

Sierra AI

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.

Best for

Large brands that want one branded agent deployed across chat, voice, email, SMS and WhatsApp, with voice agents that can take a payment mid-call, outcome-based pricing, 59 languages and the broadest compliance list in the directory including FedRAMP, ISO 42001 and the EU AI Act.

Look elsewhere if

You are not an enterprise: Sierra sells multi-year contracts by quote with no trial or self-serve start, and its verified facts do not include a stated data residency.

Pricing: Per resolution from Custom
Founded: 2023
Company: Independent, venture-backed latest: $950M at a post-money valuation above $15B (May 2026)
Channels: Chat, Email, Voice, SMS, WhatsApp
Languages: 59 languages
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

What the AI can do

Takes actions, not just answers. Sierra AI can complete tasks in your other systems: Refunds & returns
Hands off to a human with the conversation context when it cannot resolve an issue.

Published customer results

Outcomes named customers have reported, as published by the vendor or the customer.

Chime: AI resolution rate rose from 50% to over 70% Source, October 2025
Airtable: 80% AI resolution rate; workload equal to about 95 full-time agents Source

Visit Sierra AI →

See the best Sierra AI alternatives →

Frequently asked questions

Who is Sierra AI best for?: Large brands that want one branded agent deployed across chat, voice, email, SMS and WhatsApp, with voice agents that can take a payment mid-call, outcome-based pricing, 59 languages and the broadest compliance list in the directory including FedRAMP, ISO 42001 and the EU AI Act. Look elsewhere if you are not an enterprise: Sierra sells multi-year contracts by quote with no trial or self-serve start, and its verified facts do not include a stated data residency.
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.
What languages does Sierra AI support?: Sierra AI supports 59 languages.
Can Sierra AI take actions, or does it only answer questions?: Sierra AI can take actions in connected systems, not just answer questions, including refunds & returns.
When was Sierra AI founded?: Sierra AI was founded in 2023.
What are the best Sierra AI alternatives?: Popular alternatives include Auto-Respond, boost.ai, and Cognigy. See all Sierra AI alternatives →

Sources for the facts on this page

AI takes actions: sierra.ai Securely connect to your systems of record, from order management to CRM, so your agent can handle tasks for your customers from start to finish, like processing an insurance claim, returning an order, or originating a mortgage. checked September 2026
Human handoff: sierra.ai seamlessly escalating to customer experience representatives when needed checked September 2026
AI actions: sierra.ai so your agent can handle tasks for your customers from start to finish, like processing an insurance claim, returning an order, or originating a mortgage. checked September 2026
Company: techcrunch.com raising a $950 million funding round ... led by Tiger Global and GV checked September 2026
Latest funding: techcrunch.com raising a $950 million funding round ... post-money valuation above $15 billion checked September 2026

Updated October 2026

Similar AI customer support tools

Auto-Respond

Auto-Respond answers calls and supported lead messages for service businesses, qualifies each lead using the business's real services and pricing, and books appointments on the live calendar.

boost.ai

Enterprise conversational AI for banks, insurers, and public sector: high accuracy chat and voice automation.

Cognigy

Support your customers and agents with Cognigy.AI, powered by Generative AI on voice and chat

Consio

AI phone platform for Shopify brands. AI voice agents answer support calls 24/7 with live order and stock context, and call your Klaviyo and Shopify segments.

DialMind

DialMind provides AI call intelligence and custom voice agents for service businesses.

DialPhone

AI-Powered Business Communications

Know when Sierra AI changes

One plain-text email at the start of each month with every verified price change, acquisition and new listing across the directory, including any change to Sierra AI. No tracking pixels, unsubscribe in one click.