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Text-to-image (T2I) models have advanced rapidly with diffusion-based breakthroughs, yet their evaluation remains challenging. Human assessments are costly, and existing automated metrics lack accurate compositional understanding. To address these limitations, we introduce PSG-Bench, a novel benchmark featuring 5K text prompts designed to evaluate the capabilities of advanced T2I models. Additionally, we propose PSGEval, a scene graph-based evaluation metric that converts generated images into structured representations and applies graph matching techniques for accurate and scalable assessment. PSGEval is a detection based evaluation metric without relying on QA generations. Our experimental results demonstrate that PSGEval aligns well with human evaluations, mitigating biases present in existing automated metrics. We further provide a detailed ranking and analysis of recent T2I models, offering a robust framework for future research in T2I evaluation.