GPT-5.3 Codex vs Opus 4.6: We benchmarked both on our production Rails codebase — the results were surprising
We benchmarked GPT-5.3 Codex vs. Opus 4.6 on our production Rails codebase - the results were surprising. Codex is delivering better code at roughly 1/7th the price (assuming the API pricing will be the same as GPT 5.2). Opus 4.6 is a tiny improvement over 4.5, but underwhelming for what it costs
