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 **ZwZ-4B** is a fine-grained multimodal perception model built upon [Qwen3-VL-4B](https://huggingface.co/Qwen/Qwen3-VL-4B). It is trained using **Region-to-Image Distillation (R2I)** combined with reinforcement learning, enabling superior fine-grained visual understanding in a single forward pass — no inference-time zooming or tool calling required. ZwZ-4B achieves state-of-the-art performance on fine-grained perception benchmarks among open-source models of comparable size.
 
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 ## Key Features