Open RoboJev-27B judges robot success at 95.2% accuracy, 48x cheaper than GPT-6

Josef Liyanjun Chen · hf · 2026-10-27

RoboJev-27B, an open-weight vision-language judge for robot manipulation success, is now on Hugging Face. Using LoRA fine-tuning, calibrated token readouts and source-specific regularization, it hits 95.2% balanced accuracy on 268 held-out SO-101 runs, 0.890 AUROC on unseen labs, at $0.19 per 1,000 answers on one H100 (3.9 answers/s) — 48x cheaper than GPT-6 Astra and 10x cheaper than GPT-6.1 Sol while beating frontier models on accuracy. The author also projects that by 2035, 19B hours/year of robot video would need 9.5M full-time human labelers vs 21,164 GPUs with RoboJev-27B.

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