Ant AI Security Lab

AntTech

Nov 8, 2026 · Artificial Intelligence

LemonDecider 4B Beats Jev on Decision Index, Fully Open-Sources Weights & Training Data

Ant AI Security Lab releases LemonDecider 4B, a Qwen3.5-4B based decision model that scores 61.67 on Decision Index 0.4.1 Public, surpassing Jev 1.14, with 50.7ms median latency. The release includes model weights, 1.2M training samples from 287 datasets, training and evaluation code, and detailed data construction methodology.