VisCodex: Unified Multimodal Code Generation via Merging Vision and
  Coding Models
Authors: name: Lingjie Jiang; name: Shaohan Huang; name: Xun Wu; name: Yixia Li; name: Dongdong Zhang; name: Furu Wei
Published: 2025-08-13 17:00:44

Abstract: Multimodal large language models (MLLMs) have significantly advanced the
integration of visual and textual understanding. However, their ability to
generate code from multimodal inputs remains limited. In this work, we
introduce VisCodex, a unified framework that seamlessly merges vision and
coding language models to empower MLLMs with strong multimodal code generation
abilities. Leveraging a task vector-based model merging technique, we integrate
a state-of-the-art coding LLM into a strong vision-language backbone, while
preserving both visual comprehension and advanced coding skills. To support
training and evaluation, we introduce the Multimodal Coding Dataset (MCD), a
large-scale and diverse collection of 598k samples, including high-quality HTML
code, chart image-code pairs, image-augmented StackOverflow QA, and algorithmic
problems. Furthermore, we propose InfiBench-V, a novel and challenging
benchmark specifically designed to assess models on visually-rich, real-world
programming questions that demand a nuanced understanding of both textual and
visual contexts. Extensive experiments show that VisCodex achieves
state-of-the-art performance among open-source MLLMs and approaches proprietary
models like GPT-4o, highlighting the effectiveness of our model merging
strategy and new datasets.