The Sierra blog

July 16, 2026

The next Horizon in agents

Horizon agents orchestrate outbound and inbound interactions over days or weeks — not just single conversations. A context engine and long-horizon planning turn every interaction into a compounding advantage, so your agents get smarter as your customer relationships deepen. It's Sierra's outcomes-based model at scale: you pay for results, not tokens.

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March 25, 2026

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.

February 6, 2026

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.

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November 5, 2025

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.

November 5, 2025

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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Pinecone: Harnessing the wisdom of the workforce

As frontier models become more capable, companies are increasingly asking themselves the same question: What's our moat? We believe a large part of the answer lies in context.

July 15, 2026

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AI-pilling our company: lessons learned

Our AI acceleration team has been developing agents for employees across every department at Sierra. Here's what they built — and lessons learned along the way.

July 9, 2026

AI-native product localization

One Sierra engineer localized Agent Studio in four months — mostly solo, with AI coding agents. Here's what the process revealed about coordination overhead, feedback loops, and the changing shape of software engineering.

May 28, 2026

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Voice AI is only as good as what it hears

We’ve built a transcription platform that dynamically routes across providers, incorporates a customer’s context, supports 70+ languages, and adapts to real-world variability, improving both agent effectiveness and customer satisfaction.

May 18, 2026

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𝜏-knowledge: benchmarking agents on real-world knowledge

𝜏-Knowledge measures how well agents can work through messy, evolving knowledge bases to complete complex, multi-step tasks. While models are improving, they still struggle to reliably use this information in practice, leaving a large gap to real-world performance.

May 13, 2026

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Who monitors the monitors?

Sierra's always-on evaluation layer use an LLM-as-judge to review every conversation so businesses can track agent quality and customer sentiment. But who evaluates the monitors?

May 7, 2026

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Context engineering: the key to great agents

Getting LLMs the right context, at the right time, is the central challenge in building sophisticated, real-world agents. The solution: Context engineering.

May 5, 2026

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𝜏-voice: benchmarking real-time voice agents on real-world tasks

𝜏-voice is a benchmark for real-time voice agents on 278 grounded customer-service tasks across retail, airline, and telecom. It pairs deterministic, end-to-end task scoring with realistic, controllable audio — diverse personas, environmental noise, and free-form turn-taking.

May 1, 2026

The AI-native interview

We’ve redesigned our engineering interview process from the ground up.

April 22, 2026

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