Sierra
Headquarters
San Francisco, CAFounded
2023CEO / Founder
Bret TaylorEmployees
51-200Funding
Series E — $285MProducts
1 product listedAvg. AI Score
7.5/10Website
sierra.ai/
Profile updated
About Sierra
Sierra is an AI platform company founded in 2023 by Bret Taylor and Clay Bavor, headquartered in San Francisco, California. Taylor previously served as co-CEO of Salesforce and chairman of Twitter's board, while Bavor was a longtime Google executive who led Google Labs and Google VR/AR efforts. The company focuses on building AI-powered conversational agents designed for enterprise customer experience applications.
Sierra's primary product is a platform that allows businesses to deploy AI agents capable of handling customer support interactions across channels including chat and voice. The agents are designed to resolve issues autonomously rather than simply routing customers to human agents. Reported customers include companies such as SiriusXM, Sonos, and WeightWatchers, which use the platform for customer-facing support operations.
Sierra raised a $175 million Series B round in 2024 at a reported valuation of approximately $4.5 billion, following an earlier $110 million funding round. Investors include Sequoia Capital and Greenoaks Capital. The company reached a reported annualized revenue run rate in the tens of millions within its first year of operation.
Specialties
Financials
Dated, source-cited figures. Estimates are marked.
Products by Sierra
All products by Sierra reviewed by our AI panel of experts.
How Our Review Panel Scores Sierra
Six independent reviewer personalities assessed Sierra's product on their own terms. They disagreed by 2.2 points — The Finance Lead was the hardest to convince, The Domain Strategist the most positive.
Averaged across 1 reviewed product in our catalog. Scores are out of 10.
Competitive Landscape
Who Sierra competes with, and how they differ.
Decagon targets a similar enterprise customer-experience AI-agent market at a comparable stage and valuation tier; the two are the most frequently paired rivals in press coverage of the category.
1 product reviewed on TopReviewed
Salesforce bundles its Agentforce AI agents into its existing CRM install base at no extra product to buy, versus Sierra's standalone, model-agnostic Agent OS sold independently of any CRM.
2 products reviewed on TopReviewed
Intercom's Fin AI Agent is sold as an add-on to its existing messaging/helpdesk platform; Sierra is a dedicated, non-messaging AI-agent platform built for large enterprises.
1 product reviewed on TopReviewed
Ada focuses on self-serve chat/voice resolution for mid-market and enterprise support teams with a no-code builder; Sierra emphasizes an SDK-driven "Agent OS" for deeper custom enterprise workflows.
1 product reviewed on TopReviewed
Forethought grew out of support-ticket triage and agent-assist tooling before expanding into autonomous resolution; Sierra was built agent-first from day one for outcome-based enterprise deployments.
1 product reviewed on TopReviewed
Zendesk layers AI agents onto its long-established ticketing/helpdesk suite; Sierra is a newer, agent-native platform without a legacy ticketing product to maintain.
1 product reviewed on TopReviewedCompany Timeline
Key milestones in Sierra's history, with sources.
- Funding
Series E — $950M led by Tiger Global and GV, $15.8B valuation
Sierra raised $950 million led by Tiger Global and Google's GV, pushing its post-money valuation above $15 billion as ARR passed $150M.
techcrunch.com - Funding
Raised $350M led by Greenoaks Capital, $10B valuation
Sierra closed a $350 million round led by Greenoaks Capital at a $10 billion valuation, more than doubling its valuation from October 2024.
siliconangle.com - Funding
Raised $175M led by Greenoaks Capital, $4.5B valuation
Sierra raised $175 million led by Greenoaks Capital (with Thrive Capital and Iconiq) at a $4.5 billion valuation, with ARR reported to have crossed $20 million.
siliconangle.com - Launch
Emerged from stealth with $110M raised
Sierra emerged from stealth, disclosing $110 million raised from Sequoia Capital and Benchmark at a valuation reported near $1 billion.
fortune.com - Founded
Founded by Bret Taylor and Clay Bavor
Former Salesforce co-CEO Bret Taylor and ex-Google executive Clay Bavor founded Sierra in 2023 to build AI agents for enterprise customer service.
fortune.com
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