MEGA-Bench: Scaling Multimodal Evaluation to over 500 Real-World Tasks
Authors: name: Jiacheng Chen, name: Tianhao Liang, name: Sherman Siu, name: Zhengqing Wang, name: Kai Wang, name: Yubo Wang, name: Yuansheng Ni, name: Wang Zhu, name: Ziyan Jiang, name: Bohan Lyu, name: Dongfu Jiang, name: Xuan He, name: Yuan Liu, name: Hexiang Hu, name: Xiang Yue, name: Wenhu Chen

We present MEGA-Bench, an evaluation suite that scales multimodal evaluation
to over 500 real-world tasks, to address the highly heterogeneous daily use
cases of end users. Our objective is to optimize for a set of high-quality data
samples that cover a highly diverse and rich set of multimodal tasks, while
enabling cost-effective and accurate model evaluation. In particular, we
collected 505 realistic tasks encompassing over 8,000 samples from 16 expert
annotators to extensively cover the multimodal task space. Instead of unifying
these problems into standard multi-choice questions (like MMMU, MMBench, and
MMT-Bench), we embrace a wide range of output formats like numbers, phrases,
code, \LaTeX, coordinates, JSON, free-form, etc. To accommodate these formats,
we developed over 40 metrics to evaluate these tasks. Unlike existing
benchmarks, MEGA-Bench offers a fine-grained capability report across multiple
dimensions (e.g., application, input type, output format, skill), allowing
users to interact with and visualize model capabilities in depth. We evaluate a
wide variety of frontier vision-language models on MEGA-Bench to understand
their capabilities across these dimensions.