Alipay Experience Technology

Jun 29, 2026 · Artificial Intelligence

How a 4B‑Parameter UI‑UX Model Outperforms 235B Models in Detecting App Experience Flaws

The open‑source 4B UI‑UX multimodal model achieves a 0.7963 SOTA score on the UXBench benchmark, surpassing much larger models such as Claude‑4.5‑Sonnet and Qwen3‑VL‑Thinking, thanks to reward routing, asymmetric rewards, and data‑alchemy techniques, and it can be installed and deployed with a few pip commands.