Organization

Sierra

Enterprise software · San Francisco, California

Sierra provides a platform on which businesses build and run AI agents for customer service and customer experience, deployed across chat, messaging, email, and voice. It also maintains τ-bench, an open-source benchmark for evaluating customer-service agents.4 8 9 11

Last reviewedSep 29, 2026Entry updated Sep 29, 2026

Key facts

Website: sierra.ai (external site: sierra.ai)
Legal name: Sierra Technologies, Inc.1 2
Ownership: Privately held
Legal form: Delaware corporation1
Headquarters: San Francisco, California1 3 2
Founded: Unknown
Sectors: Enterprise, Agents
Careers: Careers page (external site: sierra.ai)

What is and isn’t public

An evidence-based summary of what this catalog has documented. It is not a verdict on the organization as a whole.

Sierra's agent platform is a commercial service, and the product pages reviewed do not say which language models it uses. Sierra publishes τ-bench as open-source code under the MIT License; this catalog has no record of public model weights from Sierra.5 8 9 10 11

Products

Documented products and how they are delivered. Each row links to the official page.

No hosted model products are recorded for this organization.

Other products

Sierra: other products
Product	Kind	Documented delivery and access	Reviewed
Agent Studio (external site: sierra.ai)	Enterprise software	No-code tool in Sierra's platform for customer-experience teams to build and manage AI agents from composable building blocks.6	Sep 29, 2026
Ghostwriter (external site: sierra.ai)	Enterprise software	AI assistant within Sierra's platform for building and improving agents, including creating agents from standard operating procedures, transcripts, or plain-language descriptions.7 5	Sep 29, 2026
Channels (external site: sierra.ai)	Enterprise software	Deployment of Sierra agents to voice calls, website and in-app chat, WhatsApp, Apple Business Chat, SMS, email, live-assist tools for human staff, and ChatGPT.8	Sep 29, 2026

Related open artifacts

Records in the Open Models & Tools directory that list this organization as a maintainer or publisher.

Evaluation tools (1)

τ-bench (tau2-bench)Evaluation toolAvailability: Public

Notable documented facts

Sierra's modern slavery statement for the financial year ending January 31, 2026 identifies Sierra Technologies Ltd as its UK subsidiary.1

U.S. eligibility

How this record meets the catalog’s published eligibility policy.

Eligible · basis: U.S. headquarters

Sierra's modern slavery statement (last updated February 4, 2026) states that Sierra Technologies, Inc. is a Delaware corporation headquartered in San Francisco, California. Its careers page also describes the company as headquartered in San Francisco, and its website terms give an address at 150 Sutter St, San Francisco.1 3 2

Assessed Sep 29, 2026

Eligibility policy

Sources

1.
Modern Slavery Statement | Sierra (external site: sierra.ai)
Sierra Technologies, Inc. · Official page · published Feb 4, 2026 · accessed Sep 29, 2026
2.
Terms and Conditions | Sierra (external site: sierra.ai)
Sierra Technologies, Inc. · Official page · published Feb 12, 2024 · accessed Sep 29, 2026
3.
Careers | Sierra (external site: sierra.ai)
Sierra Technologies, Inc. · Official page · accessed Sep 29, 2026
4.
About Sierra | Sierra (external site: sierra.ai)
Sierra Technologies, Inc. · Official page · accessed Sep 29, 2026
5.
Better customer experiences | Sierra (external site: sierra.ai)
Sierra Technologies, Inc. · Official page · accessed Sep 29, 2026
6.
Agent Studio | Sierra (external site: sierra.ai)
Sierra Technologies, Inc. · Official page · accessed Sep 29, 2026
7.
Ghostwriter | Sierra (external site: sierra.ai)
Sierra Technologies, Inc. · Official page · accessed Sep 29, 2026
8.
Channels | Sierra (external site: sierra.ai)
Sierra Technologies, Inc. · Official page · accessed Sep 29, 2026
9.
GitHub - sierra-research/tau2-bench: τ-Bench: A Benchmark for Tool-Agent-User Interaction in Real-World Domains (external site: github.com)
Sierra Research (GitHub) · Repository · accessed Sep 29, 2026
10.
sierra-research/tau2-bench LICENSE (external site: raw.githubusercontent.com)
Sierra Research (GitHub) · License · accessed Sep 29, 2026
11.
𝜏²-bench | Sierra (external site: sierra.ai)
Sierra Technologies, Inc. · Announcement · published Jun 10, 2025 · accessed Sep 29, 2026

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