Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.3 Codex wins overall with a score of 85 vs 72 (13 point difference).GPT-5.3 Codex wins 4 out of 4 categories.
GPT-5.3 Codex
96
GPT-5 (high)
90
GPT-5.3 Codex
95
GPT-5 (high)
85
GPT-5.3 Codex
97.1
GPT-5 (high)
94
GPT-5.3 Codex
94
GPT-5 (high)
88
GPT-5.3 Codex scores higher overall with 85 vs 72, a difference of 13 points across all benchmarks.
GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 90.
GPT-5.3 Codex leads in coding with an average score of 95 vs 85.
GPT-5.3 Codex leads in math with an average score of 97.1 vs 94.
GPT-5.3 Codex leads in reasoning with an average score of 94 vs 88.