benchlm.ai

GPT-5.3 Codex vs Grok 4.1

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

Quick Verdict

GPT-5.3 Codex wins overall with a score of 85 vs 84 (1 point difference).GPT-5.3 Codex wins 1 out of 4 categories.

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Grok 4.1

CreatorxAI
TypeProprietary
Context128K
Score84

Knowledge

Tie

GPT-5.3 Codex

96

Grok 4.1

96

99
MMLU
99
97
GPQA
97
95
SuperGPQA
95
93
OpenBookQA
93

Coding

GPT-5.3 Codex

GPT-5.3 Codex

95

Grok 4.1

91

95
HumanEval
91

Mathematics

Tie

GPT-5.3 Codex

97.1

Grok 4.1

97.1

99
AIME 2023
99
99
AIME 2024
99
98
AIME 2025
98
95
HMMT Feb 2023
95
97
HMMT Feb 2024
97
96
HMMT Feb 2025
96
96
BRUMO 2025
96

Reasoning

Tie

GPT-5.3 Codex

94

Grok 4.1

94

95
SimpleQA
95
93
MuSR
93

Frequently Asked Questions

Which is better, GPT-5.3 Codex or Grok 4.1?

GPT-5.3 Codex scores higher overall with 85 vs 84, a difference of 1 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.3 Codex or Grok 4.1?

GPT-5.3 Codex and Grok 4.1 are tied for knowledge tasks with average scores of 96.

Which is better for coding, GPT-5.3 Codex or Grok 4.1?

GPT-5.3 Codex leads in coding with an average score of 95 vs 91.

Which is better for math, GPT-5.3 Codex or Grok 4.1?

GPT-5.3 Codex and Grok 4.1 are tied for math with average scores of 97.1.

Which is better for reasoning, GPT-5.3 Codex or Grok 4.1?

GPT-5.3 Codex and Grok 4.1 are tied for reasoning with average scores of 94.

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