Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.3 Codex wins overall with a score of 85 vs 25 (60 point difference).GPT-5.3 Codex wins 4 out of 4 categories.
DeepSeek V3.1 (Reasoning)
31.8
GPT-5.3 Codex
96
DeepSeek V3.1 (Reasoning)
26
GPT-5.3 Codex
95
DeepSeek V3.1 (Reasoning)
33
GPT-5.3 Codex
97.1
DeepSeek V3.1 (Reasoning)
31
GPT-5.3 Codex
94
GPT-5.3 Codex scores higher overall with 85 vs 25, a difference of 60 points across all benchmarks.
GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 31.8.
GPT-5.3 Codex leads in coding with an average score of 95 vs 26.
GPT-5.3 Codex leads in math with an average score of 97.1 vs 33.
GPT-5.3 Codex leads in reasoning with an average score of 94 vs 31.