Update README.md

README.md

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 ## Model Summary
 
-`UnifiedReward-qwen-3b` is the first unified reward model based on [Qwen/Qwen2.5-VL-7B-Instruct](https://huggingface.co/Qwen/Qwen2.5-VL-7B-Instruct) for multimodal understanding and generation assessment, enabling both pairwise ranking and pointwise scoring, which can be employed for vision model preference alignment.
+`UnifiedReward-qwen-3b` is the first unified reward model based on [Qwen/Qwen2.5-VL-3B-Instruct](https://huggingface.co/Qwen/Qwen2.5-VL-3B-Instruct) for multimodal understanding and generation assessment, enabling both pairwise ranking and pointwise scoring, which can be employed for vision model preference alignment.
 
 For further details, please refer to the following resources:
 - 📰 Paper: https://arxiv.org/pdf/2503.05236