Exploring the Limits of Vision-Language-Action Manipulation in Cross-task Generalization

The generalization capabilities of vision-language-action (VLA) models to unseen tasks are crucial to achieving general-purpose robotic manipulation in open-world settings. However, the cross-task generalization capabilities of existing VLA models remain significantly underexplored. To address this gap, we introduce AGNOSTOS, a novel simulation benchmark designed to rigorously evaluate zeroshot cross-task generalization in manipulation. AGNOSTOS comprises 23 unseen manipulation tasks for test, which are distinct from common training task distributions, and incorporates two levels of generalization difficulty to assess robustness. Our systematic evaluation reveals that current VLA models, despite being trained on diverse datasets, struggle to generalize effectively to these unseen tasks. To overcome this limitation, we propose Cross-Task In-Context Manipulation (X-ICM), a method that conditions large language models (LLMs) on in-context demonstrations from seen tasks to predict action sequences for unseen tasks. Additionally, we introduce a dynamics-guided sample selection strategy that identifies relevant demonstrations by capturing cross-task dynamics. On AGNOSTOS, X-ICM significantly improves zero-shot cross-task generalization performance over leading VLA models, achieving improvements of 6.0% over π 0 [1] and 7.9% over VoxPoser [2]. We believe AGNOSTOS and X-ICM will serve as valuable tools for advancing general-purpose robotic manipulation. Project page: https://jiaming- zhou.github.io/AGNOSTOS/.