# 4DCodeBench tests coding agents' motion reconstruction

> Coding agents struggle to rebuild motion from video, 4DCodeBench reveals.
- Title: 4DCodeBench tests coding agents' motion reconstruction
- Summary: Coding agents struggle to rebuild motion from video, 4DCodeBench reveals. Stanford PhD student Ziga Kovacic's 4DCodeBench benchmark shows coding agents can't…
- Keywords: 4dcodebench, coding agents, motion reconstruction, video, stanford, ziga kovacic, arxiv, technology, tests, coding, agents', motion
- Source: RuntimeWire — https://runtimewire.com/article/4dcodebench-coding-agents-motion-reconstruction
- Author: RuntimeWire
- Published: 2026-10-11T04:41:26.021+00:00
- Read time: 1 min
- Topics: 4dcodebench, coding agents, motion reconstruction, video, stanford, ziga kovacic, arxiv, x, technology, ai
## 4DCodeBench benchmark
Stanford PhD student Ziga Kovacic introduced 4DCodeBench to test coding agents' ability to turn video into executable graphics code.
## 4DCodeBench finds motion gap
Coding agents produce plausible geometry without reconstructing motion that governs a scene, according to the benchmark.
## 4DCodeBench paper published
The paper appeared on arXiv on October 2nd; Kovacic described the project on X on October 5th.
## Key takeaway

Stanford PhD student Ziga Kovacic's 4DCodeBench benchmark shows coding agents can't reconstruct motion from video.