RoboColosseum Opens Real-Robot Evaluation: 100+ Robots at 124 Sites, Claude Opus 5.5 and GPT-6 Astra Rival Specialized VLA Policies Zero-Shot
Hugging Face, BitRobot, the Singapore Embodied AI Centre, NUS and others launched RoboColosseum on November 4, a distributed real-robot evaluation framework covering four embodiments: SO-101, Franka, Bimanual-YAM and the Unitree G1 humanoid. The first study ran 5,699 blinded pairwise comparisons at 124 sites across 5 VLA policies and 3 frontier models. Claude Opus 5.5 and GPT-6 Astra beat their VLA counterparts on average task progress by 12.1 and 11.0 points, while Grok 4.7 trailed by 7.5. All rollouts are open on Hugging Face, and the project pledges 10,000 free evaluation hours to academic labs.
Key Takeaways
- Two tracks: the Open Track runs blinded zero-shot pairwise comparisons, and the Fine-tune Track gives each VLA the same 100 demonstrations per task across 20 tasks.
- The VLAs tested are GR00T N1.7, pi0.5, MolmoAct2, G0.5 and LingBot-VLA v2; the frontier models are GPT-6 Astra, Claude Opus 5.5 and Grok 4.7.
- After fine-tuning, GR00T N1.7 leads on SO-101 and pi0.5 leads on Franka and Bimanual-YAM; on the G1 humanoid no policy completes any task, with average progress of 13.3% to 23.2%.
- Rankings agree only weakly across robots (Kendall W = 0.24), and zero-shot rankings poorly predict rankings after fine-tuning.






