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Hi Robot: Open-Ended Instruction Following with Hierarchical Vision-Language-Action Models

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abstract

Generalist robots that can perform a range of different tasks in open-world settings must be able to not only reason about the steps needed to accomplish their goals, but also process complex instructions, prompts, and even feedback during task execution. Intricate instructions (e.g., "Could you make me a vegetarian sandwich?" or "I don't like that one") require not just the ability to physically perform the individual steps, but the ability to situate complex commands and feedback in the physical world. In this work, we describe a system that uses vision-language models in a hierarchical structure, first reasoning over complex prompts and user feedback to deduce the most appropriate next step to fulfill the task, and then performing that step with low-level actions. In contrast to direct instruction following methods that can fulfill simple commands ("pick up the cup"), our system can reason through complex prompts and incorporate situated feedback during task execution ("that's not trash"). We evaluate our system across three robotic platforms, including single-arm, dual-arm, and dual-arm mobile robots, demonstrating its ability to handle tasks such as cleaning messy tables, making sandwiches, and grocery shopping. Videos are available at https://www.pi.website/research/hirobot

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Action with Visual Primitives

cs.RO · 2026-05-21 · unverdicted · novelty 6.0

AVP architecture has VLM emit visual-primitive tokens to condition flow-matching action expert, yielding 27.61% higher success rate than pi_0.5 on real-robot pick-and-place tasks.

G-Zero: Self-Play for Open-Ended Generation from Zero Data

cs.LG · 2026-05-11 · unverdicted · novelty 6.0

G-Zero uses the Hint-δ intrinsic reward to drive co-evolution between a Proposer and Generator via GRPO and DPO, providing a theoretical suboptimality guarantee for self-improvement from internal dynamics alone.

ExpressMM: Expressive Mobile Manipulation Behaviors in Human-Robot Interactions

cs.RO · 2026-04-07 · unverdicted · novelty 6.0

ExpressMM integrates high-level language-guided planning with low-level vision-language-action policies to enable expressive and interruptible mobile manipulation behaviors in human-robot collaboration, shown effective in an assembly task via audience evaluations.

World Action Models are Zero-shot Policies

cs.RO · 2026-02-17 · unverdicted · novelty 6.0

DreamZero uses a 14B video diffusion model as a World Action Model to achieve over 2x better zero-shot generalization on real robots than state-of-the-art VLAs, real-time 7Hz closed-loop control, and cross-embodiment transfer with 10-30 minutes of data.

$\pi^{*}_{0.6}$: a VLA That Learns From Experience

cs.LG · 2025-11-18 · unverdicted · novelty 6.0

RECAP enables a generalist VLA to self-improve via advantage-conditioned RL on mixed real-world data, more than doubling throughput and halving failure rates on hard manipulation tasks.

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