benchlm.ai

GPT-5.3 Codex vs MiMo-V2-Flash

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 63 (22 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

MiMo-V2-Flash

CreatorXiaomi
TypeOpen Weight
Context128K
Score63

Knowledge

GPT-5.3 Codex

GPT-5.3 Codex

96

MiMo-V2-Flash

76.8

99
MMLU
79
97
GPQA
78
95
SuperGPQA
76
93
OpenBookQA
74

Coding

GPT-5.3 Codex

GPT-5.3 Codex

95

MiMo-V2-Flash

71

95
HumanEval
71

Mathematics

GPT-5.3 Codex

GPT-5.3 Codex

97.1

MiMo-V2-Flash

78

99
AIME 2023
79
99
AIME 2024
81
98
AIME 2025
80
95
HMMT Feb 2023
75
97
HMMT Feb 2024
77
96
HMMT Feb 2025
76
96
BRUMO 2025
78

Reasoning

GPT-5.3 Codex

GPT-5.3 Codex

94

MiMo-V2-Flash

75

95
SimpleQA
76
93
MuSR
74

Frequently Asked Questions

Which is better, GPT-5.3 Codex or MiMo-V2-Flash?

GPT-5.3 Codex scores higher overall with 85 vs 63, a difference of 22 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.3 Codex or MiMo-V2-Flash?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 76.8.

Which is better for coding, GPT-5.3 Codex or MiMo-V2-Flash?

GPT-5.3 Codex leads in coding with an average score of 95 vs 71.

Which is better for math, GPT-5.3 Codex or MiMo-V2-Flash?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 78.

Which is better for reasoning, GPT-5.3 Codex or MiMo-V2-Flash?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 75.

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