El blog de Sierra

12 de marzo de 2026

Todo sobre el agente: Sierra desembarca en España

Sierra ya trabaja con algunas de las mayores empresas de España para crear experiencias más humanas e inteligentes con IA. Nos entusiasma seguir construyendo relaciones más sólidas con la apertura de nuestra oficina en Madrid.

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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.

5 de mayo de 2026

Better customer experiences. Built on Sierra

We’re raising $950 million from new and existing investors, at a valuation of over $15 billion.

4 de mayo de 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.

1 de mayo de 2026

Sierra acquires Fragment in France

We are excited to announce the acquisition of Paris-based Fragment, which helps businesses scale their operations using AI, freeing up employees to focus on higher value work.

23 de abril de 2026

The AI-native interview

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

22 de abril de 2026

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μ-Bench: an open multilingual transcription benchmark

μ-Bench is an open multilingual transcription benchmark built from customer service phone calls across five locales. It aims to measure transcription providers on the errors that matter in production: not just how closely transcripts match their reference, but whether they preserve the speaker’s intent.

20 de abril de 2026

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Golden articles: Evaluating and improving search

Search evaluation shouldn’t be static — it should reflect what actually helps resolve real customer issues. By measuring performance daily against production conversations and feeding those signals back into the system, we've built a continuously improving system for resolving customers’ needs.

14 de abril de 2026

An industry first: Sierra launches fully PCI-compliant payments

Sierra is introducing the first Level 1 PCI-compliant payment capability for AI agents across chat and voice. Now, agents can handle the complete transaction within one conversation – no holds or transfers.

7 de abril de 2026

Meet Linnaeus and Darwin: Search models that drive higher resolution rates

Our purpose-built retrieval and reranking models outperform off-the-shelf ones, driving up to 16 percentage point improvements in resolution rates.

3 de abril de 2026

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