benchlm.ai

GPT-5.3 Codex vs Mistral 8x7B

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 52 (33 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Mistral 8x7B

CreatorMistral
TypeOpen Weight
Context32K
Score52

Knowledge

GPT-5.3 Codex

GPT-5.3 Codex

96

Mistral 8x7B

62.8

99
MMLU
65
97
GPQA
64
95
SuperGPQA
62
93
OpenBookQA
60

Coding

GPT-5.3 Codex

GPT-5.3 Codex

95

Mistral 8x7B

55

95
HumanEval
55

Mathematics

GPT-5.3 Codex

GPT-5.3 Codex

97.1

Mistral 8x7B

64

99
AIME 2023
65
99
AIME 2024
67
98
AIME 2025
66
95
HMMT Feb 2023
61
97
HMMT Feb 2024
63
96
HMMT Feb 2025
62
96
BRUMO 2025
64

Reasoning

GPT-5.3 Codex

GPT-5.3 Codex

94

Mistral 8x7B

62

95
SimpleQA
63
93
MuSR
61

Frequently Asked Questions

Which is better, GPT-5.3 Codex or Mistral 8x7B?

GPT-5.3 Codex scores higher overall with 85 vs 52, a difference of 33 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.3 Codex or Mistral 8x7B?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 62.8.

Which is better for coding, GPT-5.3 Codex or Mistral 8x7B?

GPT-5.3 Codex leads in coding with an average score of 95 vs 55.

Which is better for math, GPT-5.3 Codex or Mistral 8x7B?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 64.

Which is better for reasoning, GPT-5.3 Codex or Mistral 8x7B?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 62.

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