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Most capable generalist robotics models today are closed or at best, open weights. But robotics won’t reach its ChatGPT moment without real openness. That GPT moment was built on years of open tools and datasets such as Python, PyTorch, ImageNet and more, that let researchers inspect, reproduce, and build. Today, we’re introducing MolmoAct 2: a fully open-source action reasoning model for real-world robotics. We rethought and reshaped everything! 🧵👇
Robotics models often struggle outside controlled environments. Ours is built to work in real ones. Today we're launching MolmoAct 2, which can assist with a host of chores & lab tasks, plus the MolmoAct 2-Bimanual YAM dataset—the largest open robotics dataset of its kind. 🧵
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In academic research for robot learning, the highest compliment is that it works.
lesgoo i’m still so amazed with molmoact2 last week i recorded a few hundred episodes and tried to fine tune all the vlas on lerobot molmoact2 was simply the undisputed best, no other vlas can come close the only thing that came close was multitaskdit, but it’s not a vla, and is small enough to be trained from scratch and be sample efficient i’ll do a write up on this soon, also going to leverage the molmoact2 dataset to reproduce their benchmark some folks told me that molmo’s moat was only data on the so101, had pi0.5 been trained with molmoact’s so101 dataset, it would have generalized too i simply don’t think that’s true (from the paper’s claims), but we’ll see
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Jiafei Duan reposted
lesgoo i’m still so amazed with molmoact2 last week i recorded a few hundred episodes and tried to fine tune all the vlas on lerobot molmoact2 was simply the undisputed best, no other vlas can come close the only thing that came close was multitaskdit, but it’s not a vla, and is small enough to be trained from scratch and be sample efficient i’ll do a write up on this soon, also going to leverage the molmoact2 dataset to reproduce their benchmark some folks told me that molmo’s moat was only data on the so101, had pi0.5 been trained with molmoact’s so101 dataset, it would have generalized too i simply don’t think that’s true (from the paper’s claims), but we’ll see
Tried to get MolmoAct2 to zero-shot pick up a cube with an SO101. The shoulder lift servo just slammed straight into the table. Finally got it working with @pham_blnh's help. The checkpoint is trained in old SO-100-era degrees (pre-PR #777). Newer SO-101 calibration flips offsets the shoulder/elbow zero and normalizes units. If you try using the new calibration on the policy zero shot, arm slams down instead of lifting. Fixes are in this @LeRobotHF fork: github.com/makermods-robotic…
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Jiafei Duan reposted
Tried to get MolmoAct2 to zero-shot pick up a cube with an SO101. The shoulder lift servo just slammed straight into the table. Finally got it working with @pham_blnh's help. The checkpoint is trained in old SO-100-era degrees (pre-PR #777). Newer SO-101 calibration flips offsets the shoulder/elbow zero and normalizes units. If you try using the new calibration on the policy zero shot, arm slams down instead of lifting. Fixes are in this @LeRobotHF fork: github.com/makermods-robotic…
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Jiafei Duan reposted
The best open-source VLA? MolmoAct2 - Beats π0.5 across 7 sim and real benchmarks, and its embodied-reasoning backbone (Molmo2-ER) tops GPT-5 and Gemini Robotics-ER 1.5 on 9 of 13 benchmarks. - A discrete-token VLM is grafted to a flow-matching continuous-action expert through a per-layer KV-cache connection - 2 design innovations 1) bridge a frozen discrete-token VLM to a continuous-control expert by feeding it the backbone's per-layer KV cache rather than sharing hidden states or fusing at the output, giving the controller depth-aligned access to the full visual-language context 2) reasoning latency isn't fixed: re-running perception only on the parts of the scene that changed exploits temporal redundancy to keep the geometric grounding while cutting the cost
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Farewell, Seattle! 👋 Thank you for an unforgettable four years. Time to head home 🇸🇬. Excited to contribute to Singapore’s embodied AI and physical AI ecosystem—there’s so much exciting momentum back home. Until we meet again!
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Jiafei Duan reposted
you don’t need a robot to see physical ai in action, you just need a browser. this week I finally tried something I've wanted to do for a while: design an SO-101 scene in three.js, connect it to a real leader arm, collect teleoperation data, train an ACT model, then port it to run in the browser. the result is the first ever demo of ACT that runs locally on the web. try it yourself now at lerobot.binhph.am
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Jiafei Duan reposted
32,000 hours of open robot data 🤖 ANYONE can get started training their own robotics models!
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Our Molmo series of robotics work from @allen_ai truly defines openness in robotics — open tools, open benchmarks, and open models for the community!
Cosmos 3 wins another leaderboard. The power of an open frontier model. 🎉 Ranked #1 on @allen_ai's MolmoSpaces robot policies leaderboard, a policy model post-trained on Cosmos 3 Nano shows the strongest performance in environments that require models to interpret, reason, and act in real time. Not just understanding the world, but interacting with it. 📊 molmospaces.allen.ai/leaderb… Drop what you're building in the comments 👇
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Jiafei Duan reposted
1/ Introducing HIW-500 (Humanoids-in-the-Wild 500): the largest open-source humanoid teleop dataset collected in real homes Built w/ @UnitreeRobotics @huggingface across 12 homes in Southeast Asia, it covers: > 500 hrs > 23K episodes > 10 TB > 10 household tasks
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Looking forward to seeing what people build with MolmoAct2 in simulation!
Since MolmoAct 2 works zero shot; sims are good place to start experimenting with models, RL and other such unconventional tricks. Here it took me couple of hours to get Genesis World working with MolmoAct2 checkpoint for bimanual YAM setup.
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Robotics still seems to be very much an academia game, just today alone there are 174 papers on ArXiv, and most of them are on VLAs and WAMs.
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Really cool to see Auto eval coming together and love that it's self-sustaining with resets, very much in the spirit of @abhishekunique7's reset-free RL work!
MolmoAct (zeroshot) meets auto evals. Thanks @DJiafei for the suggestion. What should I build next? A) Train a policy to dump the cup (no custom hardware) B) Collect intervention data to push policy performance C) Train a simpler task like pressing buttons D) Something else
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Great summary of MolmoAct2
my learnings from reading the paper if anyone is interested aryanmadhavverma.com/posts/r…
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One of my biggest takeaways from the MolmoAct series: ChatGPT's "ChatGPT moment" wasn't the product of a single company. It was built on open tools, open datasets, and open efforts from many. To reach that same GPT moment for robotics, we need the same openness that empowering not just the few, but everyone to build on this work.
There are few truly open models in the world, including both weights and data. However, these models are crucial for research and development of new systems — they help us learn which data is important and help develop new capabilities for deploying robots in the real world. MolmoAct2 provides a foundation for open research into robotics. It is associated with its own open dataset, an open-data action tokenizer, and a reasoning variant which predicts depth tokens. And people have actually been using it across the community, running experiments in their own labs or homes. @hq_fang and @DJiafei tell us more. Watch Episode 87 of RoboPapers, with @micoolcho and @chris_j_paxton, now!
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Jiafei Duan reposted
MolmoAct2 is an open-data, open-weights robotics foundation model with state-of-the-art capabilities including spatial reasoning, and which you can download and use in your own home, lab, or office. Learn more with @hq_fang and @DJiafei on @RoboPapers ->
There are few truly open models in the world, including both weights and data. However, these models are crucial for research and development of new systems — they help us learn which data is important and help develop new capabilities for deploying robots in the real world. MolmoAct2 provides a foundation for open research into robotics. It is associated with its own open dataset, an open-data action tokenizer, and a reasoning variant which predicts depth tokens. And people have actually been using it across the community, running experiments in their own labs or homes. @hq_fang and @DJiafei tell us more. Watch Episode 87 of RoboPapers, with @micoolcho and @chris_j_paxton, now!
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Language gave foundation models semantics. Vision gave them grounding. Motion may be the next ingredient. Molmo Motion explores learning from the dynamics of the world itself capturing how objects, people, and agents move through time. Check out our latest work MolmoMotion!
We're releasing MolmoMotion, a 3D motion forecasting model. Given one or a few video frames, 3D points on an object, & an instruction like "Put the white bowl on the table," MolmoMotion predicts where those points will go over the next few seconds in a shared 3D world frame. 🧵
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Open sourcing is the way forward! Science is built on top of each other!
Announcing @xdofai: We’ve raised $70 million to build the core robotic infrastructure ecosystem for robot foundation models. My cofounders Fred (@YideShentu), Nemo (@itsnemojin) and I have been pursuing the dream of general purpose robots for our entire lives. After work at Covariant, Meta and Tesla, it became clear to us that general purpose robots are coming, and we are building XDOF to help make them a reality. For the last two years, we’ve been working behind the scenes to support major labs and companies deploying robots. In us, they have a partner with full-stack expertise, from hardware to operations to policy training. As our first public contribution to the space, we are open-sourcing ABC-130K, the largest open source teleoperation dataset, in collaboration with our partners from UC Berkeley, Carnegie Mellon, MIT and Amazon FAR. Thank you to our customers, partners, collaborators and investors for your trust and conviction in us. Together, we can accelerate the future of robotics!
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MolmoAct2 running anywhere, out of the box , quietly doing tasks.
Yams running Momo entirely from the cloud. Robots in nature can't afford to carry their compute on their back. Cloud inference can flip it. Moving insanely fast in the lab, been quiet going full peak mode. More to come soon.
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Going to try this and hoping it could find MolmoAct2 Bimanual YAM checkpoint and solve the tasks in one iteration cycle. Really cool work!
Autoresearch just left the sandbox and entered the embodied world. We are excited to introduce 𝐄𝐍𝐏𝐈𝐑𝐄: a system that drops frontier coding agents onto a fleet of real robots and hands them the entire loop: reset the environment → search the literature → implement ideas and build the infra → train and deploy → self-verify → analyze the logs and rewrite the code → repeat, until the policy is reliable in the real world. No human in the loop. Guided only by the robot's self-proposed, heuristic-based success signal, the agents hill-climb to 99% on dexterous real-world tasks: organizing pins into a box, seating GPUs, tying zip-ties. We envision the bottleneck in robotics shifting — from building smarter algorithms to building the closed physical feedback loops an agent can finally turn on its own. 🔗 research.nvidia.com/labs/gea… From @NVIDIA @CMU_Robotics @Berkeley_AI 🧵
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We're happy to share that FailSafe has been accepted to #IROS2026! Data & code have all been released: jimntu.github.io/FailSafe/
What happens when actions fail—and VLAs don’t know how to recover, especially when they’re frozen? We introduce corrective decoding: bootstrapping a pre-trained VLA with a companion VLM, FailSafe trained only from simulation, that detects impending failures and issues executable 7-DoF fixes. More reliable manipulation, fewer dead-ends. 🔧🤖 jimntu.github.io/FailSafe/
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