Codex (OpenAI) vs SEMrush

Codex (OpenAI) edges out SEMrush by 0.3 points (8.3 vs 8.0) -- a A-tier vs A-tier split that's narrow but real. Not a blowout; both belong on a shortlist. The score gap shows up most clearly in the categories that matter for Codex (OpenAI)'s strengths, so if those categories are your priority, the lead translates.

Pricing-wise, both tools have a free tier (Codex (OpenAI) starts $0, SEMrush starts $0), so you can test either without committing. Compare what each free tier actually unlocks -- usage caps, model access, and feature gates differ a lot more than the headline price suggests, especially as both vendors have tightened limits in 2026.

By use case: pick Codex (OpenAI) when developers already paying for chatgpt plus who want a coding agent at no extra cost. Pick SEMrush when marketing teams and agencies who need one platform for seo, ppc, and content marketing research. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in Codex (OpenAI)'s lane, the tier-list ranking and the use-case fit point the same direction; if you're in SEMrush's lane, the score gap matters less than the fit.

Bottom line: Codex (OpenAI) is the safer default for most readers, but SEMrush is competitive enough that the tie-breaker is your specific workload, not the spec sheet.