PhysBrain 1.5 reports 72.5 average on 28 embodied understanding tests

single source· 1 articles · confidence: low · first seen 2026-09-13 20:00 UTC

What this means for you

Nothing to act on: there are no weights, no code and no reuse terms, and the 72.5 average has no published evaluation date, so it cannot be compared against a number you already hold. If your work involves robot manipulation, watch for the release — as submitted, this is a claim, not a download.

An 8B model can handle three physical-world tasks at once, according to a single arXiv paper. PhysBrain 1.5 starts from a general vision-language model and adds end-effector motion (a robot gripper's position) and dense visual targets as discrete sequences, trained with the same next-token objective as a chatbot. Pre-training uses only human interaction videos; fine-tuning mixes human demonstrations, robot trajectories and simulated experience. The authors report an average of 72.5 across 28 embodied understanding benchmarks, best open-source on 14, and claim parity with GPT-6-Astra and Gemini 3.6 Flash. No evaluation date, harness, weights or code are given.

Models in this story

Key facts

  • ·PhysBrain 1.5 is an 8B model trained to do physical-environment understanding, action generation and future-state prediction in one framework. source
  • ·It reports an average score of 72.5 across 28 embodied understanding benchmarks, with no evaluation date or harness given. source
  • ·The authors say it sets a new open-source state of the art and performs on par with GPT-6-Astra and Gemini 3.6 Flash. source
  • ·Pre-training draws embodied supervision entirely from human interaction videos; fine-tuning mixes human demonstrations, robot trajectories and simulated experience. source
  • ·It reports best open-source results on 14 of the 28 benchmarks while retaining general multimodal capabilities. source
  • ·Outputs include end-effector trajectories and predicted future scenes as RGB, depth and robot-mask images, shown as qualitative examples only. source

What the sources say

Sources

The original reporting. Follow these — they did the work.

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