kris weng

building cool robots @sundayrobotics

[kris weng @wengmister]

@hewittmcgaughey *cricket sounds*

[Junyao Shi @JunyaoShi]

ACT-2 is far more than a model achievement, it’s a full-stack systems achievement.

As soon as the policy became reliable enough to leave the lab, it became immediately obvious that “model as an API” is near impossible for home robotics. A capable policy is only half the problem; the real long tail only appears in chaotic homes.

Across 31 unseen homes, Memo had near-zero reliability issues because our ML + systems teams kept solving reality as it arrived, from edge inference to cooling GPUs after hours of continuous operation.

The model amazed me. The team that made it work in the wild amazed me more. Kudos to them @ArpitKalla @wengmister @jaiagar @TommyLi09 @nadeesha99 @shaunxsingh and to @chichengcc for the insightful piece.

[kris weng @wengmister]

@chichengcc @ArpitKalla ...and this is just one of many, many more challenges deploying robots in the real world! Reliability is a full-stack problem

[kris weng @wengmister]

@shaunxsingh Wdym I can’t have Claude take over my socials 😭

[kris weng @wengmister]

My favorite shot: 5x5 grid of Memos, all folding at once, all finishing.

Hardware reliability work is invisible precisely when it succeeds - that shot exists because we ground through every single failure mode.

A fleet where every robot works isn't luck. It's engineering 🦾

[Tony Zhao @tonyzzhao]

This property allows us to hill-climb performance in our office, and trust those gains to hold in unseen homes

Our fleet of Memos runs in parallel to rapidly advance reliability, quality, and speed.

Left: fleet-scale improvement in-house
Right: Memo working across unseen homes

[kris weng @wengmister]

@ArpitKalla @tonyzzhao Oh man you gotta tell me more about those WiFi hiccups 🤣

[kris weng @wengmister]

@shaunxsingh We're all Full Stack Solves Engineers now

[kris weng @wengmister]

@johnson_zhsh is polymarket still open for the 4th attempt??

[kris weng @wengmister]

every single failure mode except this comment section 💀

[kris weng @wengmister]

@johnson_zhsh Discombobulated!

[Tony Zhao @tonyzzhao]

Introducing ACT-2 Preview

The first robotics model to unify broad generalization with high reliability. A single fine-tuning example can teach Memo a new behavior that generalizes.

Zero shot, real unseen homes, 99% success rate.

[Tony Zhao @tonyzzhao]

The poll results are obvious.
We’re heads down now. 7/17

[kris weng @wengmister]

@Rainmaker1973

[kris weng @wengmister]

@tonyzzhao @flooburrito It’s time to lock in

[kris weng @wengmister]

@Apcornation Ok I’m gonna need tips

[kris weng @wengmister]

@JunyaoShi Demos (and hacks for them) won’t take you far 🙂‍↔️

[kris weng @wengmister]

@Apcornation @flooburrito howdy

[kris weng @wengmister]

guess which one of us pays rent in labor

[Fabi @flooburrito]

roomies

[kris weng @wengmister]

🦾🦾

[Sheng Zhong @johnson_zhsh]

The project I've been leading is done, and it's already a big unlock for the company. Can't share details yet, but announcements soon from @sundayrobotics !

[kris weng @wengmister]

@LeoKharon @Vikashplus @shadowrobot Name a tendon driven robotic hand that is reliable