Zack Reneau-Wedeen

@SierraPlatform

[Vijay Iyengar @vijayiyengar]

https://t.co/B3aaJ9VVjE

[Vijay Iyengar @vijayiyengar]

https://t.co/BpkqIWTEgV

[Neil Rahilly @neilrahilly]

https://t.co/PsyDfxoz1x

[Bret Taylor @btaylor]

I’m excited to announce that Sierra has acquired Opera Tech in Japan.

Opera’s co-founders, Keita Morikawa and Kiyo Kunii, started the company with the simple idea that AI could help businesses deliver high-quality customer experiences at scale. We’re so excited to have them join us to lead Sierra in Japan. https://t.co/tR5P4NHu36

[Zack Reneau-Wedeen @ZackRW]

👻 We're launching Ghostwriter today! 👻

After spending the past 2+ years building agents by hand, I think this is as big a deal for agent building as Codex and Claude Code are for software engineering.

Check out Bret's demo! 👇

[Bret Taylor @btaylor]

Today, Sierra is releasing Ghostwriter, our agent for building agents. With Ghostwriter, you can create an AI agent for your customer experience — one that can chat, pick up the phone, speak dozens of languages, take action on your systems of record, and be protected with industry-leading guardrails — simply by having a conversation. No clicking, no forms, no menus.

Codex and Claude Code have transformed how we build software, making it possible for software engineers to orchestrate and review the work rather than doing all the work themselves. We think the same transformation will happen for all software. Rather than every enterprise app having a web app for humans and an API for automation, every software platform’s UI will be an agent that can do the work on your behalf.

I recorded a demo of my building and optimizing an agent with Ghostwriter so you can see how powerful and easy it is to use. It’s completely changed the way our early adopters build agents, and it’s changed the way I think about the software industry. Let me know what you think, and, if you’re interested in trying it out at your business, please reach out directly.

[Sierra @SierraPlatform]

Excited for what's coming later today.

[Sierra @SierraPlatform]

The atomic unit of customer experience is no longer a conversation, it's a relationship. This year, our customers didn't just see that shift—they led it.

[Sierra @SierraPlatform]

In case you missed it: here’s everything we launched at Sierra Summit. 🚀🏔️
1⃣Publish to ChatGPT
2⃣Live Assist
3⃣New Journeys
4⃣Workspaces
5⃣Integrations Library
6⃣Explorer
7⃣Expert Answers
8⃣Agent Data Platform
https://t.co/rIk8xrj4iD

[Annelies Gamble @AnneliesGamble]

What does it actually take to build and ship AI products that work at scale?

At AI Native Summit 2025, we’re bringing together some of the most experienced product leaders for a candid, tactical conversation about building AI products people actually use:

🎤 Antonia Woodford – Head of Growth, ChatGPT @OpenAI
🎤 Zack Reneau-Wedeen – Head of Product @SierraPlatform
🎤 Eddie Zhou – Founding Engineer @glean
🎤 Selena Wang – Product @Harveyaisol

This panel will go deep on:
➡️ Defining and measuring actual value delivered
➡️ Balancing pushing the boundaries of model capabilities with shipping reliable products to enterprise customers
➡️ Surprising lessons learned from shipping AI products
➡️ Choosing different product strategies for vertical vs. horizontal applications
And much, much more

📍 September 10, 2025 | @SFJAZZ , San Francisco
🎟 Limited spots left, register now! https://t.co/X7B2ymiX4E

CC @ZettaVentures

[Bret Taylor @btaylor]

Simulations are a new kind of testing for a new kind of software, simulating conversations between AI agents and mock personas ensure reliability at scale https://t.co/IC56DKLIi6

[Granola @meetgranola]

We can't wait to welcome @PeifferPol and @ZackRW from @sierraplatform to Granola HQ on August 5th!

[Sierra @SierraPlatform]

Whether you no code or know code, Sierra helps brands build better, more human customer experiences fast ... and all from one platform. https://t.co/snHVD9PT6K

[Zack Reneau-Wedeen @ZackRW]

@ardabrowski @latentspacepod @SierraPlatform @swyx Hey Andrzej, great question. Our Agent SDK is fully externalized and available to customers, but it's not currently open source.

So that means we have many devs building agents on the platform directly, but at present they all either work for Sierra or for one of our customers.

[Zack Reneau-Wedeen @ZackRW]

@latentspacepod has been my favorite AI podcast for years, and I'm so proud to be part of the team building @sierraplatform, so this was particularly fun to get to talk about Sierra at @swyx's conference.

[AI Engineer @aiDotEngineer]

🆕 One of the most successful agent companies in the world is @SierraPlatform, cofounded by @btaylor who happens to be Chairman of @OpenAI. But they've been relatively stealthy about *how* they build and operate....

until now.

https://t.co/AN8MfD7Kil

We're honored for @ZackRW to pull back the curtain on Sierra's Agent SDLC - or ADLC - for the first time ever!

They're also hiring - at the last World's Fair a chance convo with an attendee led to a fantastic new hire - so talk to Zack for more! even if you're not looking for a job, @sierraplatform is worth a follow on X :)

[Zack Reneau-Wedeen @ZackRW]

@stephenenke The vast majority of our customers today are building for synchronous conversations over the phone, but I think I'm with you. There are definitely other interesting experiences you could design (async, web / mobile app, etc.) if you relax that constraint.

[Zack Reneau-Wedeen @ZackRW]

Remember "m-dot" mobile sites (like https://t.co/yOzjGI8FGe)? Now, websites are responsive, adapting to screen size & device.

We applied this concept to Agent OS: no matter how customers reach out—phone, chat, email, or text—Sierra agents are always responsive & ready to help.

[Sierra @SierraPlatform]

Build once. Deploy everywhere.

From chat to voice to email, Sierra agents adapt to every channel your customers use.

🎥 Our Product Manager, @zackrw, explains how in this quick Q&A: https://t.co/Fw6Auua2xH

[Zack Reneau-Wedeen @ZackRW]

@stephenenke Thank you! And great question, that's an interesting example. Our experience so far is that customer-facing applications tend to be the most valuable, but to your point we've also built out agent assist with customers for internal use as well.

[Sierra @SierraPlatform]

Chat AI? Delightful.
Call customer service and get a phone tree? The worst.

Product Manager @zackrw explains how Sierra is changing that.

🎥 See how in this Q&A. https://t.co/y2UaanyoeB

[Sierra @SierraPlatform]

We’re thrilled to announce our international expansion with the opening of our third office in London. As a global center of innovation, the UK has long been home to exceptional talent, and we’re excited to grow our presence and collaborate with the best. 🇬🇧

Think you’re a match? Discover open roles: https://t.co/SxilhWytjR

[Zack Reneau-Wedeen @ZackRW]

Nobody likes waiting on hold, but companies don't like putting you on hold either. Now they can pick up the phone right away, every time.

[Sierra @SierraPlatform]

Today we're excited to announce a new way to interact with Sierra agents: voice. Learn more about how this new capability is transforming customer interactions in our latest blog post.: https://t.co/Df55o11H4U