/AI1d ago

Siheng Zhao launches LadderMan, a control system for zero-shot sim-to-real ladder climbing on the Unitree G1 humanoid robot

It integrates vision-language depth mapping for real-time environmental sensing.

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Original postPeter Chen#719
Siheng Zhao@SihengZhao

🪜 What if humanoids could climb ladders and work on them straight out of simulation?

Meet LadderMan: a perceptive system for zero-shot sim-to-real ladder climbing and on-ladder manipulation.

Watch the humanoid climb, stabilize, and manipulate—all in one system. 🤖👇

8:53 AM · Jun 8, 2026 · 68.6K Views
Sentiment

Many users praise LadderMan for enabling humanoid robots to climb ladders and manipulate objects zero-shot from simulation as impressive and exciting work, while one dismisses it as a flashy narrative shift.

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14 comments with sentiment.
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VIEWS13KBOOKMARKS19LIKES82
Eric Jang@ericjang11

In time, people will come to understand "why humanoid"

Siheng Zhao@SihengZhao

🪜 What if humanoids could climb ladders and work on them straight out of simulation?

Meet LadderMan: a perceptive system for zero-shot sim-to-real ladder climbing and on-ladder manipulation.

Watch the humanoid climb, stabilize, and manipulate—all in one system. 🤖👇

16hViews 13KLikes 82Bookmarks 19
RETWEETS29
Siheng Zhao@SihengZhao

🪜 What if humanoids could climb ladders and work on them straight out of simulation?

Meet LadderMan: a perceptive system for zero-shot sim-to-real ladder climbing and on-ladder manipulation.

Watch the humanoid climb, stabilize, and manipulate—all in one system. 🤖👇

1dViews 68.6KLikes 259Bookmarks 93
REPLIES12
Robert Scoble@Scobleizer

300 people a year die by falling off ladders every year in the United States alone, Grok reports.

Siheng Zhao@SihengZhao

🪜 What if humanoids could climb ladders and work on them straight out of simulation?

Meet LadderMan: a perceptive system for zero-shot sim-to-real ladder climbing and on-ladder manipulation.

Watch the humanoid climb, stabilize, and manipulate—all in one system. 🤖👇

14hViews 7.3KLikes 43Bookmarks 3
Guanya Shi@GuanyaShi

Humanoid🪜

Siheng Zhao@SihengZhao

🪜 What if humanoids could climb ladders and work on them straight out of simulation?

Meet LadderMan: a perceptive system for zero-shot sim-to-real ladder climbing and on-ladder manipulation.

Watch the humanoid climb, stabilize, and manipulate—all in one system. 🤖👇

17hViews 5.8KLikes 44Bookmarks 7
Animesh Garg@animesh_garg

"why humanoid" gets another case study? Expansion of capability envelope of humanoids and importantly in a very data and compute efficient manner.

the recipe that worked for locomotion in increasingly working on loco-manipulation and perceptive locomotion.

- data to generate reference ("what") - RL in sim to create experts ("how") - Distillation to add visual observations - Deployment on real env.

Siheng Zhao@SihengZhao

🪜 What if humanoids could climb ladders and work on them straight out of simulation?

Meet LadderMan: a perceptive system for zero-shot sim-to-real ladder climbing and on-ladder manipulation.

Watch the humanoid climb, stabilize, and manipulate—all in one system. 🤖👇

1hViews 2.4KLikes 17Bookmarks 3
Yuanhang Zhang@Yuanhang__Zhang

Check out our new work LadderMan -- a perceptive system that achieves humanoid loco-manipulation on LADDERS! Please see @SihengZhao's post for more details.

Siheng Zhao@SihengZhao

🪜 What if humanoids could climb ladders and work on them straight out of simulation?

Meet LadderMan: a perceptive system for zero-shot sim-to-real ladder climbing and on-ladder manipulation.

Watch the humanoid climb, stabilize, and manipulate—all in one system. 🤖👇

1dViews 2.9KLikes 24Bookmarks 1
Chris Paxton@chris_j_paxton

Humanoid robot climbing a ladder and manipulating.

Siheng Zhao@SihengZhao

🪜 What if humanoids could climb ladders and work on them straight out of simulation?

Meet LadderMan: a perceptive system for zero-shot sim-to-real ladder climbing and on-ladder manipulation.

Watch the humanoid climb, stabilize, and manipulate—all in one system. 🤖👇

14hViews 2.7KLikes 13Bookmarks 0
Siheng Zhao@SihengZhao

6/ There has been a wave of exciting recent progress in humanoid whole-body perceptive locomotion and robot ladder climbing. - Learning Whole-Body Humanoid Locomotion via Motion Generation and Motion Tracking (https://wholebodylocomotion.github.io/) by @ctki49, @JayHe748646, @breadli428, and @ChongZzZhang. This work presents a scalable framework for learning diverse whole-body humanoid locomotion skills through motion generation and motion tracking. - Perceptive Humanoid Parkour (https://php-parkour.github.io/) by @zhenkirito123, @x_h_ucb, and @lujieyang98. This work demonstrates perceptive humanoid parkour using depth observations for challenging whole-body tasks such as obstacle climbing and vaulting. - Robust Ladder Climbing with a Quadrupedal Robot (https://sites.google.com/leggedrobotics.com/climbingladders). This work presents a learning-based ladder climbing system capable of robust deployment on a quadrupedal robot.

Additionally, we leverage Fast-FoundationStereo (https://nvlabs.github.io/Fast-FoundationStereo/) by @bowenwen_me for bridging the sim-to-real perception gap through real-time stereo depth estimation during deployment.

1dViews 415Likes 4
Siheng Zhao@SihengZhao

4/ LadderMan also supports keyboard-based climbing direction control:

1dViews 127Likes 3Bookmarks 1
Siheng Zhao@SihengZhao

2/ 🌐 Project Website: http://ladderman-robot.github.io

Ladder climbing pushes humanoids to their limits: • Sparse and narrow footholds and handholds • Sustained whole-body coordination • Tiny perception or control errors can lead to catastrophic failures

1dViews 289Likes 2
Siheng Zhao@SihengZhao

3/ To tackle these challenges, LadderMan integrates a complete perception-to-control pipeline: 🔹 Two-stage climbing policy learning. First learn multiple state-based expert policies from a single reference motion via hybrid motion tracking, and then distill them into a unified visuomotor policy via hybrid DAgger + RL. 🔹 During real-world deployment, we leverage a vision foundation model for robust depth estimation, enabling zero-shot sim-to-real perception transfer. 🔹 On-ladder manipulation. We train a teleoperation policy via dual-agent learning, achieving stronger performance than off-the-shelf whole-body teleoperation baselines.

1dViews 188Likes 2
bilal@bilaltwovec

yoo i support a six month pause on humanoid robot capabilities specifically now

Siheng Zhao@SihengZhao

🪜 What if humanoids could climb ladders and work on them straight out of simulation?

Meet LadderMan: a perceptive system for zero-shot sim-to-real ladder climbing and on-ladder manipulation.

Watch the humanoid climb, stabilize, and manipulate—all in one system. 🤖👇

16hViews 608Likes 4Bookmarks 0
Siheng Zhao@SihengZhao

7/ 🙌 Acknowledgement: This was an exciting project that I worked on during my internship at Amazon FAR, with amazing collaboration from @Yuanhang__Zhang, @520xyxyzq, and insightful advice from @pabbeel, @rocky_duan, @KoushilSreenath, @yuewang314, C. Karen Liu, and @GuanyaShi.

1dViews 145Likes 1
Siheng Zhao@SihengZhao

5/ LadderMan is evaluated on three diverse real-world ladders using a single unified policy.

In simulation, we evaluate the learned climbing policy across ladders with varying rung spacing z and inclination angle φ. We compare LadderMan against a blind motion tracking baseline trained without perception.

1dViews 115Likes 1
Matt Gibson@MattGibsonMusic

@Scobleizer right becase it HAS to be bipedal...lol

11hViews 32Likes 1
HΞX@createnotfind

@ericjang11 humanoid is more general, but recent work on humanoid loco manip seems do more loco than manip. how do we get the humanoid do diverse difficult manipulation tasks in a whole body manner ?

15hViews 32
DeBarra Shaw@D2Chattoway

@Scobleizer Thanks for highlighting the issue of ladder falls, Robert. We see it a lot here, and more education is helpful about ladder safety. Balance and stability is key.✨

6hViews 22Likes 4
Haozhi Qi@HaozhiQ

@SihengZhao cool!

17hViews 456Likes 1
Zhen Wu@zhenkirito123

@SihengZhao amazing works!

18hViews 343Likes 1
Chenhao Li@breadli428

@SihengZhao Very cool! Congrats!

7hViews 209Likes 1
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