benchlm.ai

Gemini 1.5 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 54 (31 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

Gemini 1.5 Pro

CreatorGoogle
TypeProprietary
Context2M
Score54

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Knowledge

GPT-5.3 Codex

Gemini 1.5 Pro

62.5

GPT-5.3 Codex

96

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

Coding

GPT-5.3 Codex

Gemini 1.5 Pro

56

GPT-5.3 Codex

95

56
HumanEval
95

Mathematics

GPT-5.3 Codex

Gemini 1.5 Pro

63

GPT-5.3 Codex

97.1

64
AIME 2023
99
66
AIME 2024
99
65
AIME 2025
98
60
HMMT Feb 2023
95
62
HMMT Feb 2024
97
61
HMMT Feb 2025
96
63
BRUMO 2025
96

Reasoning

GPT-5.3 Codex

Gemini 1.5 Pro

61

GPT-5.3 Codex

94

62
SimpleQA
95
60
MuSR
93

Frequently Asked Questions

Which is better, Gemini 1.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex scores higher overall with 85 vs 54, a difference of 31 points across all benchmarks.

Which is better for knowledge tasks, Gemini 1.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 62.5.

Which is better for coding, Gemini 1.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex leads in coding with an average score of 95 vs 56.

Which is better for math, Gemini 1.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 63.

Which is better for reasoning, Gemini 1.5 Pro or GPT-5.3 Codex?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 61.

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