Writing an Essay with AI: Codex vs Claude Code

I recently published Science Catch-Up - a 16-chapter essay examining the limits of the scientific method and proposing a framework for evaluating knowledge without waiting for consensus. The full essay was written with AI assistance: first with OpenAI Codex (GPT 5.2/5.3), then with Claude Code (Opus 4.5/4.6). The difference in quality was striking. Not in the way you'd expect from a code generation comparison - but in the far demanding territory of prose. The essay is available on Payhip (English) and Payhip (Spanish). The project Science Catch-Up is not a light read.