benchlm.ai

GPT-5.3 Codex vs Llama 4 Behemoth

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 39 (46 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Llama 4 Behemoth

CreatorMeta
TypeOpen Weight
Context32K
Score39

Knowledge

GPT-5.3 Codex

GPT-5.3 Codex

96

Llama 4 Behemoth

45.8

99
MMLU
48
97
GPQA
47
95
SuperGPQA
45
93
OpenBookQA
43

Coding

GPT-5.3 Codex

GPT-5.3 Codex

95

Llama 4 Behemoth

40

95
HumanEval
40

Mathematics

GPT-5.3 Codex

GPT-5.3 Codex

97.1

Llama 4 Behemoth

47

99
AIME 2023
48
99
AIME 2024
50
98
AIME 2025
49
95
HMMT Feb 2023
44
97
HMMT Feb 2024
46
96
HMMT Feb 2025
45
96
BRUMO 2025
47

Reasoning

GPT-5.3 Codex

GPT-5.3 Codex

94

Llama 4 Behemoth

45

95
SimpleQA
46
93
MuSR
44

Frequently Asked Questions

Which is better, GPT-5.3 Codex or Llama 4 Behemoth?

GPT-5.3 Codex scores higher overall with 85 vs 39, a difference of 46 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.3 Codex or Llama 4 Behemoth?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 45.8.

Which is better for coding, GPT-5.3 Codex or Llama 4 Behemoth?

GPT-5.3 Codex leads in coding with an average score of 95 vs 40.

Which is better for math, GPT-5.3 Codex or Llama 4 Behemoth?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 47.

Which is better for reasoning, GPT-5.3 Codex or Llama 4 Behemoth?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 45.

Related Comparisons

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