How I AI Claude Opus 4.6 vs. GPT-5.3 Codex: How I shipped 93,000 lines of code in 5 days
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Feb 11, 2026 They run the newest AI coding models head-to-head on a real redesign and large refactor. They compare creative planning and visual redesign skills versus code review and architecture analysis. They reveal how two models combined shipped massive change quickly and discuss cost and workflow tradeoffs for fast, expensive model variants.
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Use Git Work Trees For Safe Parallel AI Work
- Use Git concepts (branches, work trees, diffs, PRs) to safely coordinate AI agents and parallel work.
- Give each agent its own work tree to avoid collisions and enable concurrent changes.
Make Skills And Automations First-Class
- Treat reusable prompt bundles (skills) as first-class engineering assets to standardize agent behavior.
- Automations and prebuilt skills speed adoption by giving clear, repeatable building blocks.
Codex Was Too Literal For Broad Redesigns
- Claire tested GPT-5.2/5.3 Codex to redesign her marketing site but found the model too literal and prone to overfitting prompts.
- The result required heavy prompting and only produced a limited two-page redesign despite broader requests.