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Related papers: Spatial CAPTCHA: Generatively Benchmarking Spatial…

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CAPTCHA, originally designed to distinguish humans from robots, has evolved into a real-world benchmark for assessing the spatial reasoning capabilities of vision-language models. In this work, we first show that step-by-step reasoning is…

Computer Vision and Pattern Recognition · Computer Science 2025-11-18 Python Song , Luke Tenyi Chang , Yun-Yun Tsai , Penghui Li , Junfeng Yang

CAPTCHAs have long been essential tools for protecting applications from automated bots. Initially designed as simple questions to distinguish humans from bots, they have become increasingly complex to keep pace with the proliferation of…

Cryptography and Security · Computer Science 2025-02-25 Ziqi Ding , Gelei Deng , Yi Liu , Junchen Ding , Jieshan Chen , Yulei Sui , Yuekang Li

Spatial reasoning, which requires ability to perceive and manipulate spatial relationships in the 3D world, is a fundamental aspect of human intelligence, yet remains a persistent challenge for Multimodal large language models (MLLMs).…

Artificial Intelligence · Computer Science 2025-11-21 Weichen Liu , Qiyao Xue , Haoming Wang , Xiangyu Yin , Boyuan Yang , Wei Gao

As multimodal large language models (LLMs) advance, traditional CAPTCHAs have become obsolete at distinguishing humans from bots. To address this shift, this paper aims to investigate the possibility of using tasks for which humans have…

Cryptography and Security · Computer Science 2026-04-07 Choon-Hou Rafael Chong

This paper studies how multimodal large language models (MLLMs) undermine the security guarantees of visual CAPTCHA. We identify the attack surface where an adversary can cheaply automate CAPTCHA solving using off-the-shelf models. We…

Cryptography and Security · Computer Science 2026-05-13 Junyu Wang , Changjia Zhu , Yuanbo Zhou , Lingyao Li , Xu He , Mingkui Wei , Junjie Xiong

CAPTCHAs have been a critical bottleneck for deploying web agents in real-world applications, often blocking them from completing end-to-end automation tasks. While modern multimodal LLM agents have demonstrated impressive performance in…

Artificial Intelligence · Computer Science 2025-06-02 Yaxin Luo , Zhaoyi Li , Jiacheng Liu , Jiacheng Cui , Xiaohan Zhao , Zhiqiang Shen

Spatial cognition is fundamental to real-world multimodal intelligence, allowing models to effectively interact with the physical environment. While multimodal large language models (MLLMs) have made significant strides, existing benchmarks…

Artificial Intelligence · Computer Science 2026-05-08 Peiran Xu , Sudong Wang , Yao Zhu , Jianing Li , Gege Qi , Yunjian Zhang

Spatial relation reasoning is a crucial task for multimodal large language models (MLLMs) to understand the objective world. However, current benchmarks have issues like relying on bounding boxes, ignoring perspective substitutions, or…

Computer Vision and Pattern Recognition · Computer Science 2025-08-11 Jingping Liu , Ziyan Liu , Zhedong Cen , Yan Zhou , Yinan Zou , Weiyan Zhang , Haiyun Jiang , Tong Ruan

Benefiting from strong and efficient multi-modal alignment strategies, Large Visual Language Models (LVLMs) are able to simulate human visual and reasoning capabilities, such as solving CAPTCHAs. However, existing benchmarks based on visual…

Artificial Intelligence · Computer Science 2025-12-15 Jianyi Zhang , Ziyin Zhou , Xu Ji , Shizhao Liu , Zhangchi Zhao

4D spatial intelligence involves perceiving and processing how objects move or change over time. Humans naturally possess 4D spatial intelligence, supporting a broad spectrum of spatial reasoning abilities. To what extent can Multimodal…

Genuine spatial reasoning relies on the capacity to construct and manipulate coherent internal spatial representations, often conceptualized as mental models, rather than merely processing surface linguistic associations. While large…

Artificial Intelligence · Computer Science 2026-03-04 Peiyao Jiang , Zequn Qin , Xi Li

Spatial reasoning plays a vital role in both human cognition and machine intelligence, prompting new research into language models' (LMs) capabilities in this regard. However, existing benchmarks reveal shortcomings in evaluating…

Computation and Language · Computer Science 2024-05-27 Fangjun Li , David C. Hogg , Anthony G. Cohn

Multimodal Large Language Models (MLLMs) have demonstrated impressive performance in general vision-language tasks. However, recent studies have exposed critical limitations in their spatial reasoning capabilities. This deficiency in…

Machine Learning · Computer Science 2025-06-04 Huanyu Zhang , Chengzu Li , Wenshan Wu , Shaoguang Mao , Yifan Zhang , Haochen Tian , Ivan Vulić , Zhang Zhang , Liang Wang , Tieniu Tan , Furu Wei

CAPTCHAs are widely used by websites to block bots and spam by presenting challenges that are easy for humans but difficult for automated programs to solve. To improve accessibility, audio CAPTCHAs are designed to complement visual ones.…

Sound · Computer Science 2026-01-14 Ziqi Ding , Yunfeng Wan , Wei Song , Yi Liu , Gelei Deng , Nan Sun , Huadong Mo , Jingling Xue , Shidong Pan , Yuekang Li

CAPTCHA (Completely Automated Public Truing test to tell Computers and Humans Apart) is a widely used technology to distinguish real users and automated users such as bots. However, the advance of AI technologies weakens many CAPTCHA tests…

Machine Learning · Computer Science 2021-01-08 Rulin Shao , Zhouxing Shi , Jinfeng Yi , Pin-Yu Chen , Cho-Jui Hsieh

Vision-Language Models (VLMs) have recently emerged as powerful tools, excelling in tasks that integrate visual and textual comprehension, such as image captioning, visual question answering, and image-text retrieval. However, existing…

Computer Vision and Pattern Recognition · Computer Science 2025-03-26 Ilias Stogiannidis , Steven McDonagh , Sotirios A. Tsaftaris

Completely Automated Public Turing tests to tell Computers and Humans Apart (CAPTCHAs) are a foundational component of web security, yet traditional implementations suffer from a trade-off between usability and resilience against AI-powered…

Cryptography and Security · Computer Science 2025-10-06 Ayda Aghaei Nia

For human cognitive process, spatial reasoning and perception are closely entangled, yet the nature of this interplay remains underexplored in the evaluation of multimodal large language models (MLLMs). While recent MLLM advancements show…

Computation and Language · Computer Science 2025-08-28 Chengzu Li , Wenshan Wu , Huanyu Zhang , Qingtao Li , Zeyu Gao , Yan Xia , José Hernández-Orallo , Ivan Vulić , Furu Wei

Spatial reasoning is a crucial component of both biological and artificial intelligence. In this work, we present a comprehensive study of the capability of current state-of-the-art large language models (LLMs) on spatial reasoning. To…

Computation and Language · Computer Science 2024-06-10 Md Imbesat Hassan Rizvi , Xiaodan Zhu , Iryna Gurevych

Spatial intelligence is essential for multimodal large language models (MLLMs) operating in the complex physical world. Existing benchmarks, however, probe only single-image relations and thus fail to assess the multi-image spatial…

Computer Vision and Pattern Recognition · Computer Science 2026-05-26 Sihan Yang , Runsen Xu , Yiman Xie , Sizhe Yang , Mo Li , Jingli Lin , Chenming Zhu , Xiaochen Chen , Haodong Duan , Xiangyu Yue , Dahua Lin , Tai Wang , Jiangmiao Pang
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