Claude Opus 4.5 and Gemini 3 Flash Used to Build a Specification-Driven Team Chat System

This article describes the development of a team chat system using Claude Opus 4.5 and Gemini 3 Flash, addressing challenges encountered in a previous survey system project. The author aimed to overcome issues related to specification-driven development by refining prompts. The project's scope revealed new challenges as the application grew. The article highlights the use of specific AI models and tools, including Antigravity, and provides details on the development timeline. The primary goal was to improve the AI's adherence to documentation and instructions.