Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.3 Codex wins overall with a score of 85 vs 43 (42 point difference).GPT-5.3 Codex wins 4 out of 4 categories.
GPT-5.3 Codex
96
Z-1
49.8
GPT-5.3 Codex
95
Z-1
44
GPT-5.3 Codex
97.1
Z-1
51
GPT-5.3 Codex
94
Z-1
49
GPT-5.3 Codex scores higher overall with 85 vs 43, a difference of 42 points across all benchmarks.
GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 49.8.
GPT-5.3 Codex leads in coding with an average score of 95 vs 44.
GPT-5.3 Codex leads in math with an average score of 97.1 vs 51.
GPT-5.3 Codex leads in reasoning with an average score of 94 vs 49.