Sierra ブログ

2026年3月27日

Sierra、日本発のAI企業「OPERA TECH」を買収

本日、Sierraは東京を拠点とするエンタープライズAI企業、株式会社OPERA TECHを買収したことを発表いたします。

Text: Sierra acquires Opera Tech in Japan.

2025年11月5日

Sierra Agent OS 2.0: from answers to memory and action

At Sierra Summit, we unveiled the future of AI agents: a single agent that works across every channel, learns from every interaction, and builds real customer relationships. With eight new products, including Agent Studio 2.0 and the Agent Data Platform, Sierra is turning the promise of AI-powered customer experience into reality.

2026年3月25日

Agents as a Service

Sierra is reimagining software for the agent era—where you simply describe the outcome, and intelligent agents build, execute, and continuously improve the work for you. Meet Ghostwriter, the agent that creates and optimizes other agents, turning your ideas into production-ready customer experiences without clicks, code, or complexity.

2026年2月6日

Year two in review

Sierra is heading into year three with over $150M in ARR, powered by rapid adoption from some of the world’s largest companies. The growth reflects a simple idea: when AI is built around real jobs to be done (not experiments), even the biggest enterprises can see meaningful impact fast.

White text "Year two" on a grainy background with diagonal orange, yellow, and blue color gradients.

2025年11月5日

Introducing Agent Data Platform

Sierra’s first-of-its-kind Agent Data Platform (ADP) gives agents memory, context, and intelligence — turning every interaction into a human, personalized experience. Powered by Agent OS, ADP helps companies move from answering questions to anticipating needs.

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𝜏-Entity: Can voice agents get the details right?

Today we’re introducing 𝜏-Entity, a benchmark that measures whether an agent can capture a detail correctly, recognize when it might be wrong, and repair the mistake.

2026年10月22日

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𝜏-i18n: Evaluation across languages and beyond task completion

𝜏-i18n extends 𝜏-Voice to five more languages: Spanish, Brazilian Portuguese, Hindi, Korean, and Mandarin.

2026年10月21日

Caller ID in the age of agents

Introducing fleming-1, Sierra’s own model for detecting when the caller on a phone call is another agent.

2026年10月8日

"When AI goes from tool to teammate" on a blurry background

Ghostwriter: When AI goes from tool to teammate

Ghostwriter now works alongside your team in Slack and Teams — always on, proactive, and asynchronous. It moves past “I did what you asked” to “I noticed something you should see” and “I have an idea we haven’t tried.”

2026年9月28日

Your agent, laid bare

For decades, enterprise software was a black box — hard for companies to understand, implement, adapt, and integrate, or even replace. With Sierra, nothing is hidden. It’s easy to build an agent, understand the actions it takes, integrate it with existing systems, and make changes directly.

2026年9月22日

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Next gen multimodal agents: an interface that morphs with the conversation

Sierra’s multimodal agents bring voice, text, and visuals into the same conversation, so customers get the best of each medium without having to pick just one.

2026年9月10日

White text "ττ-bench" on a blurry, grainy background transitioning from orange to yll.

Hyper-𝜏-bench: Evaluating agents that build agents

Today we’re open-sourcing hyper-𝜏-bench, a new long horizon agent evaluation that measures how well models can not only act as an agent, but construct one.

2026年9月8日

"Agency" on a blurred light green background

Agency: Secure, scalable sandboxes for agents

The hardest part of building great agents isn’t the model — it’s everything around it. That’s where Agency comes in, the infrastructure that gives every Pinecone session and every task for Ghostwriter (our agent-building agent for customers) a secure place to live and run.

2026年7月29日

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Building Sierra’s MCP Gateway: An engineering iceberg

Sharing the biggest lessons we learned building Sierra’s MCP Gateway — and what it looks like to build software in an AI-first engineering organization.

2026年7月22日

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