I ran Claude Code, Codex, and Cursor on the same AI model, and the tool mattered more than I expected
Almost every part of the process changed, except the end result
I recently conducted an experiment comparing three AI coding tools—Claude Code, Codex, and Cursor—on the same AI model. I wanted to determine if the underlying model played a significant role or if the tool itself made a substantial difference in the generated code. To ensure a fair comparison, I used the Sonnet 5.5 model with high reasoning, a WebSocket proxy, and a 30-minute time limit for each tool.
Despite using the same model, the final code produced by each tool varied in structure and added extra features. All three tools passed the same set of tests, but Codex and Cursor used German when rewriting UI elements, while Claude Code wrote in English. While the underlying model was consistent, the tools exhibited different approaches to code restructuring, defensive coding, and additional testing.
Ultimately, the choice of tool may depend on personal preferences and specific project requirements.
Written by urgent.news from XDA Developers's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
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