Challenge: Existing chart understanding benchmarks focus on single-chart tasks, neglecting multi-hop reasoning required to extract and integrate information from multiple charts.
Approach: They propose a benchmark that evaluates MLLMs’ capabilities in four key areas: direct question answering, parallel question answering and comparative reasoning.
Outcome: The proposed benchmark evaluates MLLMs’ capabilities in four key areas: direct question answering, parallel question answering and comparative reasoning.

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Challenge: Chart question answering (ChartQA) tasks are a critical part of visualization charts.
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Challenge: Misleading visualizations can distort perception and lead to incorrect conclusions.
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POLYCHARTQA: Benchmarking Large Vision-Language Models with Multilingual Chart Question Answering (2026.acl-long)

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Challenge: Existing chart understanding benchmarks are overwhelmingly English-centric, limiting their accessibility and relevance to global audiences.
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Beyond Single Plots: A Benchmark for Question Answering on Multi-Charts (2026.findings-acl)

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Challenge: Existing research on chart understanding has been limited to single chart images.
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MLLM-Bench: Evaluating Multimodal LLMs with Per-sample Criteria (2025.naacl-long)

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Challenge: Existing evaluation methodologies for multimodal large language models are limited in evaluating objective queries without considering real-world user experiences.
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Challenge: Chart question answering (CQA) is a multimodal task for evaluating the reasoning capabilities of vision-language models.
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Protecting multimodal large language models against misleading visualizations (2026.acl-long)

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Challenge: MLLMs are robust to misleading visualizations, i.e., charts that distort the underlying data, leading readers to draw inaccurate conclusions.
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ChartEdit: How Far Are MLLMs From Automating Chart Analysis? Evaluating MLLMs’ Capability via Chart Editing (2025.findings-acl)

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Challenge: Multimodal large language models have demonstrated promising results in a variety of tasks that combine vision and language.
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ErrorRadar: Benchmarking Complex Mathematical Reasoning of Multimodal Large Language Models Via Error Detection (2026.findings-acl)

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Challenge: Current mathematical benchmarks focus on evaluating MLLMs’ problem-solving ability, yet there is a crucial gap in addressing more complex scenarios such as error detection.
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