benchlm.ai

Gemini 2.5 Pro vs GPT-5.3 Codex

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 65 (20 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

Gemini 2.5 Pro

CreatorGoogle
TypeProprietary
Context2M
Score65

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Knowledge

GPT-5.3 Codex

Gemini 2.5 Pro

81.5

GPT-5.3 Codex

96

83
MMLU
99
83
GPQA
97
81
SuperGPQA
95
79
OpenBookQA
93

Coding

GPT-5.3 Codex

Gemini 2.5 Pro

75

GPT-5.3 Codex

95

75
HumanEval
95

Mathematics

GPT-5.3 Codex

Gemini 2.5 Pro

83

GPT-5.3 Codex

97.1

84
AIME 2023
99
86
AIME 2024
99
85
AIME 2025
98
80
HMMT Feb 2023
95
82
HMMT Feb 2024
97
81
HMMT Feb 2025
96
83
BRUMO 2025
96

Reasoning

GPT-5.3 Codex

Gemini 2.5 Pro

80

GPT-5.3 Codex

94

81
SimpleQA
95
79
MuSR
93

Frequently Asked Questions

Which is better, Gemini 2.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex scores higher overall with 85 vs 65, a difference of 20 points across all benchmarks.

Which is better for knowledge tasks, Gemini 2.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 81.5.

Which is better for coding, Gemini 2.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex leads in coding with an average score of 95 vs 75.

Which is better for math, Gemini 2.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 83.

Which is better for reasoning, Gemini 2.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 80.

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