Verdict
GPT-5.3 Codex leads 3–1 across 4 shared benchmarks.
GPT-5.2 1 · GPT-5.3 Codex 3 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
GPT-5.3 Codex leads 3–1 across 4 shared benchmarks. GPT-5.2 leads 1 benchmark and GPT-5.3 Codex leads 3. Higher isn't always better — see the integrity caveats on each benchmark.
GPT-5.2 and GPT-5.3 Codex have 4 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.