Originally published May 24, 2026. People keep searching for this comparison, and most of what ranks is stale or vibes. The first version of this post was vibes too. This rewrite is numbers: every price, limit, and score below was checked against official docs and leaderboards on July 21, 2026. One naming trap before we start: Codex here means OpenAI's current coding agent, not the retired 2021 model that once powered the original Copilot. The 30-second version GitH...