Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.3 Codex wins overall with a score of 85 vs 58 (27 point difference).GPT-5.3 Codex wins 4 out of 4 categories.
GPT-5.3 Codex
96
Llama 3.1 405B
68.5
GPT-5.3 Codex
95
Llama 3.1 405B
62
GPT-5.3 Codex
97.1
Llama 3.1 405B
69
GPT-5.3 Codex
94
Llama 3.1 405B
67
GPT-5.3 Codex scores higher overall with 85 vs 58, a difference of 27 points across all benchmarks.
GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 68.5.
GPT-5.3 Codex leads in coding with an average score of 95 vs 62.
GPT-5.3 Codex leads in math with an average score of 97.1 vs 69.
GPT-5.3 Codex leads in reasoning with an average score of 94 vs 67.