Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.2-Codex wins overall with a score of 82 vs 42 (40 point difference).GPT-5.2-Codex wins 4 out of 4 categories.
GPT-5.2-Codex
96
GPT-OSS 120B
48.8
GPT-5.2-Codex
95
GPT-OSS 120B
43
GPT-5.2-Codex
97.1
GPT-OSS 120B
50
GPT-5.2-Codex
94
GPT-OSS 120B
48
GPT-5.2-Codex scores higher overall with 82 vs 42, a difference of 40 points across all benchmarks.
GPT-5.2-Codex leads in knowledge tasks with an average score of 96 vs 48.8.
GPT-5.2-Codex leads in coding with an average score of 95 vs 43.
GPT-5.2-Codex leads in math with an average score of 97.1 vs 50.
GPT-5.2-Codex leads in reasoning with an average score of 94 vs 48.