Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.3 Codex wins overall with a score of 85 vs 64 (21 point difference).GPT-5.3 Codex wins 4 out of 4 categories.
DeepSeek Coder 2.0
77.8
GPT-5.3 Codex
96
DeepSeek Coder 2.0
82
GPT-5.3 Codex
95
DeepSeek Coder 2.0
80
GPT-5.3 Codex
97.1
DeepSeek Coder 2.0
77
GPT-5.3 Codex
94
GPT-5.3 Codex scores higher overall with 85 vs 64, a difference of 21 points across all benchmarks.
GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 77.8.
GPT-5.3 Codex leads in coding with an average score of 95 vs 82.
GPT-5.3 Codex leads in math with an average score of 97.1 vs 80.
GPT-5.3 Codex leads in reasoning with an average score of 94 vs 77.