The motivation for this benchmark study is to provide systematic evaluation for UQ models in predicting polymer properties, including 𝑇 𝑔 , 𝐸 𝑔 , 𝑇 𝑚 and 𝑇 𝑑 . Reliable UQ metrics are essential for determining the confidence of model predictions and improving decision-making processes. These metrics ensure that the evaluation is not limited to accuracy but extends to the quality of uncertainty estimates, which is crucial for functional polymer discovery. (a), provide a standard basis for evaluating the alignment between predicted and actual property values across polymer datasets.