# PACT-VLA: Verifying speculative action chunks with pre-commit observations

- Source: arXiv cs.RO
- Published: 2026-10-21T04:00:00.000Z
- RoboHot: https://robohot.news/en/items/khq67z3md0lm1fmna3zski24i
- Original: https://arxiv.org/abs/2610.28019

## Summary

PACT-VLA proposes a training-free framework that, in asynchronous inference, uses pre-commit observations to select the best-matching action chunk. Its scoring function, FlowRes, measures the residual between the direction of a candidate's latent flow and the velocity predicted by the frozen policy under that observation, without needing a separate verifier.