I am talking about functional flaws, not cosmetic ones. For example, in web apps, where a11y is mandated, Claude Code kept violating accessibility (regardless of the installed skills), and even the lackluster GitHub Copilot with some outdated models always finds serious violations. Codex constantly finds race conditions and other timing flaws for distributed services written by Claude Code. But I have to admit that Codex sucks at web design compared to Claude Code!