Sierra

Enterprise AI agents that handle customer conversations across voice, chat and messaging, priced by outcome

Paidsierra.aiUpdated 19 Oct 2026

About Sierra

Sierra is a conversational AI platform that lets businesses build and run AI agents for customer experience. The agents handle customer conversations over voice, chat, SMS, WhatsApp, email and ChatGPT, drawing on a company's knowledge sources and connected systems to answer questions and complete tasks. It was founded by Bret Taylor (CEO) and Clay Bavor (President), and its customer list on the homepage includes Rocket Mortgage, Gap Inc., SiriusXM, Hyatt, Uber, Vanguard, Wayfair, ADT and Discord.

Best for

Large companies automating high-volume customer conversations across voice and digital channels with outcome-based pricing
Customer service automation: Agents resolve support questions and tasks over chat, email and messaging.
Voice support: Phone agents replace IVR menus for inbound and outbound calls.
Retention and cancellations: Experiments in Insights target potential cancellations to improve long-term value.
Proactive outreach: Horizon agents manage multi-day or multi-week interactions with customers.
Knowledge upkeep: Knowledge gap detection and Expert Answers draft articles from how reps resolve edge cases.

Not ideal for

Small teams wanting self-serve signup or a published price list

Popular with

Enterprise customer experience teams
Contact centers
Financial services
Healthcare
Telecom
Retail
Travel and hospitality
Media
Technology and public sector organizations

Screenshots

Key features

Agent Studio
Ghostwriter
Voice agents
Multi-channel deployment
Horizon
Context Engine
Insights and Explorer
Experiments
Knowledge management
Trust and reliability

Pros and cons

Pros

Outcome-based pricing ties cost to results rather than seats or tokens.
Covers voice, chat, SMS, WhatsApp, email and ChatGPT from one agent build.
Ghostwriter can create agents from existing SOPs, transcripts or audio interviews.
Large enterprise customer base named on the homepage, including Uber, Vanguard and Hyatt.
Broad compliance list, including SOC 2, ISO 42001, HIPAA and FedRAMP.
Built-in analytics, monitors and experiments for tuning agent behavior.

Cons

No published pricing and no self-serve signup or free trial found.
Aimed at enterprises; small businesses are not the evident target.
Outcome-based billing can make monthly cost harder to forecast.
Public documentation for developers (API or SDK) was not found on the official site.

Pricing

Plans as listed by the vendor on 19 Oct 2026. Check their site for current prices.

See sierra.ai

Enterprise

Our ratings

Scored out of 10 by the Finder Atlas editorial team.

7.6overall

Ease of Use: 7.5
Feature Depth: 8.5
Value for Money: 7.0
Performance & Speed: 8.0
Documentation & Support: 7.0

Platforms and integrations

Available on

Works with

Snowflake
Databricks
Redis
AWS
Google Cloud
Slack
Microsoft Teams
WhatsApp
ChatGPT

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Release history

Sep 1, 2026
Ghostwriter as a teammate
Ghostwriter now works alongside teams in Slack and Teams, proactively and asynchronously.
Jul 1, 2026
Horizon agents
Agents orchestrate interactions over days or weeks using a context engine and long-horizon planning.
May 1, 2026
Funding announcement
Sierra said it is raising $950 million at a valuation of over $15 billion.

Reviews

No reviews yet

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Frequently asked questions

How much does Sierra cost?

Sierra does not publish prices. It describes outcome-based pricing, where customers pay for results rather than seats or tokens, and quotes are provided through sales.

Is there a free trial or free plan?

None was found on the official site. Access starts with a conversation with the sales team via the Learn more page.

Which channels do Sierra agents support?

Chat, SMS, WhatsApp, email, voice (inbound and outbound) and ChatGPT, built once and deployed across channels.

Who founded Sierra?

Bret Taylor and Clay Bavor, who met while working at Google. Sierra's structured site data lists the founding year as 2023 and San Francisco as the location.

Do I need engineers to build an agent?

Agent Studio is described as no-code, and Ghostwriter can create agents from SOPs, transcripts or plain-English descriptions. Connecting to internal systems may still need technical work.

What languages does the site support?

The site is offered in English, Spanish, French, German, Japanese and Korean.

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