I've been using Opus 4.6 and Codex 5.3 every day for about a month now. They both have their strengths. They both have their weaknesses. Anthropic and OpenAI both made good models. Here's how I use both.

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Claude Opus 4.6 and OpenAI Codex 5.3 are compared across real-world coding tasks. Codex excels at thorough, reliable code generation and complex migrations, rarely missing details but sometimes over-engineering solutions. Opus ships faster and handles frontend/design better, but frequently skips important details and creates security issues. Codex is better for large codebases and serious engineering work, while Opus works well for quick prototypes and system configuration. Both $200/month subscriptions are generous with usage limits, though Claude Code's interface has significant reliability issues including failed compactions and lost context.

A realistic comparison of Opus and Codex