Roboticist at Neuromeka, KR

Seoul, Korea
Joined January 2019
Here we show one of our experiments on AI + automation in factory. Built from certified industrial hardware, the system is fully compliant in the industrial enviroment. It achieved: 1. 99.4% SR (verified by actual QC tests) 2. 5.5 hours continuous run 3. Near-human takt time
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Can a robot assemble tight-clearance parts using only its proprioception? No camera, no tactile sensor, no F/T sensor, no joint torque sensing, no priors over the object geometries or poses: just joint position readings. It actually can! Blind policies trained in simulation insert pegs, mesh gears, and thread nuts, and the peg policy works zero-shot in the real world. Here's what we found 🧵 Joint work with @BronarsToni, my wonderful co-first author, who's on the job market right now! Advised by @kushalk_ and @pulkitology.
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😕👍
We found a way to scale humanoid control that reduces GPU-hours by more than 1000×. Across 129,514 motions, SuperMimic surpasses the state of the art (128 GPUs, 7 days) with 1 GPU in 3 hours. Project: supermimic.github.io Demo: supermimic.github.io/demo/
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⚡️ A goal that is close in space can be far away in time ⏳ Introducing ChronoSRL: We give the critic of self-supervised RL a temporal geometry, so embedding distances measure the time to reach a goal 🤖 Play with the policy on quadruped task and more: nico-bohlinger.github.io/chr…
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Joonho Lee retweeted
the highlight of IROS
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Using large-scale GPU parallelized reinforcement learning in Isaac Sim, we are able to obtain a robust whole-body controller for Taku optimized for precise loco-manipulation.
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Joonho Lee retweeted
Contrastive Language Models HF: huggingface.co/Contrastive-L…
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check out our sim and code release! some super useful envs for evals, rl etc for people to try out!
Happy to announce the full ABC release! We’re also excited that ABC was accepted to CoRL 2026! Check out our website for code, 400+ hours of sim data on 24 tasks, and 5,850 labeled policy-evaluation episodes. @arthurallshire @Cinnabar233 @ritvik_singh9 @redstone_hong @davidrmcall
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After co-inventing ChatGPT, I kept asking myself: why have superhuman chat models not led to AGI? I’ve spent the last 2 years in stealth building a new way to train models (RLCD), and a new type of frontier AI model that we are releasing today: Jev • 20-200x faster • 40-400x cheaper (w/ output tokens free) • Frontier composable intelligence optimized for decisions AFAICT the shortest path to AI-based economic revolution
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🎉 FADA is now accepted to CoRL 2026! Along with the code, we’re releasing something a little different: a timeline of the research journey behind FADA — the ideas we tried, what failed, the choices we made, and the lessons we learned along the way. lecar-lab.github.io/FADA-hum… Research papers are great at telling us what worked. They are much worse at telling us everything researchers tried before getting there. We think exposing that trajectory can give the community a much richer and more honest ground-truth context particularly in the age of AI-assisted robotics research. We’d love to see more projects share their research journeys this way: turn your update slides to a shareable timeline!!. Understanding why certain choices were made (and which mistakes didn’t work) is just as valuable as the final result. Inspired from @breadli428's efforts on adding limitation threads to his works and @TairanHe99's timeline videos in VIRAL. 🧵
FADA got into CoRL 2026, and the code is out 🎉 Adapt a humanoid to new conditions from two minutes of its own experience. No rewards, no demonstrations, no simulator retuning. Now you can run the full pipeline yourself and adapt your own humanoid to whatever environment you drop it into, in only two minutes. 💻 github.com/LeCAR-Lab/FADA
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Joonho Lee retweeted
GPT-6 Astra scored 95% on a robot control task, up from Fable 5.1's 40%, with 6.2x fewer output tokens at 2.3x lower cost. 🧵
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A new breakthrough is coming. Stay tuned.
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Something I was working on.
One brain. For any robot. 🤖 We’re launching Gemini Robotics 2: our next-generation physical AI bringing full body intelligence to humanoids, advanced dexterity, multi-robot teamwork and more.
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Good that some people still care about getting shit done 🥹
MPPI, teacher-student learning, and VLA — all with 100% simulation data, easy, cheap, scalable. 🚀 Deformable–rigid interaction has long been a bottleneck for fast & accurate simulators. Our GPU-native synthetic data pipeline breaks it for deformable sim2real. 🧵
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Best one so far
"A parcel with snacks has been delivered for Flexion. Retrieve it using the stairs and come up using the elevator. Then unpack it and place the items into the empty drawer on the shelf in the snack area." One instruction. No human operator. Everything that follows is autonomous. Today we're introducing Reflect v1.0, our robotics intelligence platform for long-horizon work. From a single natural-language command, the robot understands the task, navigates a multi-floor building, calls elevators, handles doors, uses tools to unpack a box, and puts the items away. The biggest shift in v1.0 is that we use reinforcement learning across every layer, from low-level control to high-level reasoning. Long-horizon autonomy is unforgiving. The robot must recover on its own when things don't go to plan because in the real world, they never do. Combining reasoning, perception, physical execution and runtime robustness into a single mission-capable system is the foundation required to solve humanoid autonomy. Our team is just getting started. #HumanoidRobots #Flexion
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Joonho Lee retweeted
Today, we bring SAC to RSL-RL, one of the most widely used RL frameworks in massively parallel robot learning, developed at RSL @leggedrobotics. We try to understand the long-standing performance gap between SAC and PPO, and crystallize important factors sabagian.github.io/sac_relea…
PPO has long dominated robot locomotion training in simulation. SAC, despite its sample efficiency, couldn't keep up. We analyze why: 🔗sabagian.github.io/sac_relea… 🔥Integrated into RSL-RL, our approach requires only minimal changes, making SAC a drop-in alternative out of the box.
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I'm talking about this one xitter.cf/i/status/2061497197259…
It seems pick-and-place is not yet solved Now I see what the *Human-in-the-loop means
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Joonho Lee retweeted
Cool work done by my students @ctki49 @KehanWen170077 Perceptive motion generator + tracker on rough terrain.
❗️Flat-terrain tracking is solved. Rough terrain breaks everything, because the reference itself has to change. So we built a system that generates references as it goes. 🦿Parkour over boxes, hurdles, stairs - all onboard. 🔗 wholebodylocomotion.github.i… 📄 arxiv.org/abs/2604.17335
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Japanese robotics startup Tokyo Robotics has developed a humanoid robot called Torobo. The robot walks with smooth and natural human-like movement. It can also copy human motions in real time through full-body remote control while maintaining good balance.
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