Beyond Accuracy: Evaluating Grounded Visual Evidence in Thinking with Images

• URL: http://arxiv.org/abs/2601.11633v1
• Date: Wed, 14 Jan 2026 07:25:15 GMT
• Title: Beyond Accuracy: Evaluating Grounded Visual Evidence in Thinking with Images
• Authors: Xuchen Li, Xuzhao Li, Renjie Pi, Shiyu Hu, Jian Zhao, Jiahui Gao,
• Abstract summary: We propose ViEBench, a process-verifiable benchmark designed to evaluate faithful visual reasoning.<n>Comprising 200 multi-scenario high-resolution images with expert-annotated visual evidence, ViEBench categorizes tasks by difficulty into perception and reasoning dimensions.<n>Our experiments yield several interesting observations: (1) VLMs can sometimes produce correct final answers despite grounding on irrelevant regions, and (2) they may successfully locate the correct evidence but still fail to utilize it to reach accurate conclusions.
• Score: 34.324634481264034
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Despite the remarkable progress of Vision-Language Models (VLMs) in adopting "Thinking-with-Images" capabilities, accurately evaluating the authenticity of their reasoning process remains a critical challenge. Existing benchmarks mainly rely on outcome-oriented accuracy, lacking the capability to assess whether models can accurately leverage fine-grained visual cues for multi-step reasoning. To address these limitations, we propose ViEBench, a process-verifiable benchmark designed to evaluate faithful visual reasoning. Comprising 200 multi-scenario high-resolution images with expert-annotated visual evidence, ViEBench uniquely categorizes tasks by difficulty into perception and reasoning dimensions, where reasoning tasks require utilizing localized visual details with prior knowledge. To establish comprehensive evaluation criteria, we introduce a dual-axis matrix that provides fine-grained metrics through four diagnostic quadrants, enabling transparent diagnosis of model behavior across varying task complexities. Our experiments yield several interesting observations: (1) VLMs can sometimes produce correct final answers despite grounding on irrelevant regions, and (2) they may successfully locate the correct evidence but still fail to utilize it to reach accurate conclusions. Our findings demonstrate that ViEBench can serve as a more explainable and practical benchmark for comprehensively evaluating the effectiveness agentic VLMs. The codes will be released at: https://github.com/Xuchen-Li/ViEBench.

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