Carbon, Opus, and Astra Build the Same Website: Which Has Better Design, Faster Speed, and Lower Cost? An Analysis of 3 Rounds of Same-Task Testing
Author’s note: Based on a set of Agrumea Farm website-cloning tests, this article compares Gemini 4 Carbon, Claude Opus 5.5, and GPT-6 Astra on three dimensions: design fidelity and interaction requirements, time taken, and API-equivalent cost. It also covers how to choose by scenario and how to rerun the test yourself. What happens when you…