I Pitted Gemini CLI Against Claude Code to Create Flappy Bird

This repository explores the capabilities of Google's Gemini CLI and Anthropic's Claude Code by challenging each to build a Flappy Bird game.

Initial prompt: "build the flappy bird game using svelte and vite"

• Model: Claude Opus 4 (claude-opus-4-20250514)

• Model: Gemini 2.5 Pro and 2.5 Flash

Claude Code

• took just one prompt
• nice UI styling
• high cost, ~$4, with opus 4

Gemini CLI

• FREE
• lots of fixes needed after first build
• auto switched from 2.5 pro to 2.5 flash midway due to "slow response"

This experiment was created to explore the practical differences between two leading AI coding assistants through a fun, tangible project.