benchlm.ai

Gemini 3.1 Flash-Lite 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 53 (32 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

Gemini 3.1 Flash-Lite

CreatorGoogle
TypeProprietary
Context1M
Score53

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Knowledge

GPT-5.3 Codex

Gemini 3.1 Flash-Lite

60.8

GPT-5.3 Codex

96

63
MMLU
99
62
GPQA
97
60
SuperGPQA
95
58
OpenBookQA
93

Coding

GPT-5.3 Codex

Gemini 3.1 Flash-Lite

55

GPT-5.3 Codex

95

55
HumanEval
95

Mathematics

GPT-5.3 Codex

Gemini 3.1 Flash-Lite

62

GPT-5.3 Codex

97.1

63
AIME 2023
99
65
AIME 2024
99
64
AIME 2025
98
59
HMMT Feb 2023
95
61
HMMT Feb 2024
97
60
HMMT Feb 2025
96
62
BRUMO 2025
96

Reasoning

GPT-5.3 Codex

Gemini 3.1 Flash-Lite

59

GPT-5.3 Codex

94

60
SimpleQA
95
58
MuSR
93

Frequently Asked Questions

Which is better, Gemini 3.1 Flash-Lite or GPT-5.3 Codex?

GPT-5.3 Codex scores higher overall with 85 vs 53, a difference of 32 points across all benchmarks.

Which is better for knowledge tasks, Gemini 3.1 Flash-Lite or GPT-5.3 Codex?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 60.8.

Which is better for coding, Gemini 3.1 Flash-Lite or GPT-5.3 Codex?

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

Which is better for math, Gemini 3.1 Flash-Lite or GPT-5.3 Codex?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 62.

Which is better for reasoning, Gemini 3.1 Flash-Lite or GPT-5.3 Codex?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 59.

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