benchlm.ai

GPT-5.2-Codex vs Grok 3 [Beta]

Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.

Quick Verdict

GPT-5.2-Codex wins overall with a score of 82 vs 33 (49 point difference).GPT-5.2-Codex wins 4 out of 4 categories.

GPT-5.2-Codex

CreatorOpenAI
TypeProprietary
Context400K
Score82

Grok 3 [Beta]

CreatorxAI
TypeProprietary
Context128K
Score33

Knowledge

GPT-5.2-Codex

GPT-5.2-Codex

96

Grok 3 [Beta]

39.8

99
MMLU
42
97
GPQA
41
95
SuperGPQA
39
93
OpenBookQA
37

Coding

GPT-5.2-Codex

GPT-5.2-Codex

95

Grok 3 [Beta]

34

95
HumanEval
34

Mathematics

GPT-5.2-Codex

GPT-5.2-Codex

97.1

Grok 3 [Beta]

41

99
AIME 2023
42
99
AIME 2024
44
98
AIME 2025
43
95
HMMT Feb 2023
38
97
HMMT Feb 2024
40
96
HMMT Feb 2025
39
96
BRUMO 2025
41

Reasoning

GPT-5.2-Codex

GPT-5.2-Codex

94

Grok 3 [Beta]

39

95
SimpleQA
40
93
MuSR
38

Frequently Asked Questions

Which is better, GPT-5.2-Codex or Grok 3 [Beta]?

GPT-5.2-Codex scores higher overall with 82 vs 33, a difference of 49 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.2-Codex or Grok 3 [Beta]?

GPT-5.2-Codex leads in knowledge tasks with an average score of 96 vs 39.8.

Which is better for coding, GPT-5.2-Codex or Grok 3 [Beta]?

GPT-5.2-Codex leads in coding with an average score of 95 vs 34.

Which is better for math, GPT-5.2-Codex or Grok 3 [Beta]?

GPT-5.2-Codex leads in math with an average score of 97.1 vs 41.

Which is better for reasoning, GPT-5.2-Codex or Grok 3 [Beta]?

GPT-5.2-Codex leads in reasoning with an average score of 94 vs 39.

Related Comparisons

GPT-5.2-Codex vs GPT-5.4GPT-5.2-Codex vs Gemini 3.1 ProGPT-5.2-Codex vs Claude Opus 4.6GPT-5.2-Codex vs GPT-5.3 CodexGPT-5.2-Codex vs Grok 4.1GPT-5.2-Codex vs GPT-5.2