Sierra at Open@Epic! AI agents built on Sierra connect directly to @HeyEpic, so patients can easily verify their identity, book or reschedule appointments, and send questions to their care team. Excited about what’s next for healthcare customers running on Epic.

How well do voice agents work across languages — and how natural do they sound? Today we’re introducing 𝜏-i18n (pronounced tau-internationalization), which extends 𝜏-Voice to five more languages: Spanish, Brazilian Portuguese, Hindi, Korean, and Mandarin. We also included two new measures for voice quality beyond task completion: interaction, and generation quality. Read more: sierra.ai/blog/tau-i18n

For more than 145 years, Singtel has evolved alongside its customers, who now expect every interaction to be convenient, reliable, and fast. Its AI agent responds in a tone that feels natural and locally relevant. The agent is part of a company-wide commitment to AI that includes training 13,000 employees and governance that keeps pace with innovation. Sierra is proud to partner with Singtel as they work to become the world’s most intelligent connectivity company. Read more about our partnership with Singtel: sierra.ai/customers/singtel

We've partnered with @stripe so customers can get answers and pay in the same conversation, with no transfer and no payment link. @CedarNY is one of the first to take phone payments through the integration. When a patient calls Cedar's agent Kora about a bill, they can ask about a charge, pay securely on their keypad, and get confirmation without leaving the call — and 71.3% of those calls end in a successful payment. "Medical bills create a moment of real anxiety for patients, and historically, getting a question answered and actually paying the bill have been two separate, disconnected steps. Working with Sierra and Stripe, we've closed that gap. A patient can call confused about a charge and leave the conversation with clarity and a resolved balance, in the same call." — Dugan Winkie, Chief Strategy Officer, Cedar Read more: sierra.ai/blog/from-conversa…

Voice agents are getting better at thinking and speaking at the same time, and in multiple languages. We’ve been working with @googlecloud and @GoogleDeepMind to test Gemini 3.8 Live Extended Thinking against real-world enterprise scenarios. The model scored 35.1% on Sierra’s τ-Voice-banking benchmark, while delivering low latency and competitive pricing. Excited about what this unlocks for voice.

We love seeing what people are building with Tau 🚀

Lots of question about personal agents in London today: is this an opportunity to grow my business, or are these agents going to dis-intermediate me from my customers? How do I distinguish legitimate personal agents from bots and fraud? Fundamentally: How can I remain in control of my customer experience in this new world? No-one has all the answers but Personal Agent Protocol is the start.

Full house in London.

A cab-load of people at our first Sierra Summit in London.

Introducing Sierra’s partner ecosystem: the technology platforms, marketplaces, and service partners bringing Sierra to more businesses around the world. Excited to work with companies that share our commitment to helping businesses deliver better outcomes for their customers. Read more: sierra.ai/blog/the-sierra-pa…

Arriving in London for Sierra Summit tomorrow.