We Asked GPT-5.5 and Claude Opus 4.7 to Design 5 UIs (blog.kilo.ai)

In a recent test comparing AI models GPT-5.5 and Claude Opus 4.7, both were tasked with designing user interfaces (UIs) for five different applications, revealing significant differences in their design capabilities. Although GPT-5.5 showcased improvements over previous versions, producing UI designs that resemble modern SaaS templates, Claude Opus 4.7 stood out for its nuanced understanding of design elements such as typography and color usage. Each model was given identical prompts tailored for various UI types, from landing pages to dashboards, highlighting distinct strengths—GPT-5.5 often adhering to a template-like consistency, while Opus displayed a more sophisticated, contextually aware approach to design. The comparison is significant for the AI/ML community as it underscores the evolving prowess of these generative models in creative fields, specifically UI design. Despite GPT-5.5 generating more polished outputs overall, its tendency to overlook critical prompt requirements, such as calls to action and proper layout functionality, points to a need for further refinement. Conversely, while Claude Opus 4.7 maintained adherence to prompt specifics, it also faced minor technical flaws, emphasizing that neither model is entirely production-ready without additional human intervention. With GPT-5.5 being priced higher, this analysis offers vital insights into cost-effectiveness and design fidelity for developers and organizations leveraging AI for design tasks.