A developer-tool walkthrough describes building an editorial-calendar web app with Codex and having Claude Code review it. Although the interface worked, the review flagged a 41 KB stylesheet compressed into 19 lines, contrast and small-text issues, saving the entire workspace on every keystroke, and possible overwrites across tabs. The author found targeted improvements more useful than rebuilding. However, the account includes neither quantitative token comparisons nor a controlled model evaluation, so another model’s findings still need verification through actual behavior and tests.