benchlm.ai

GPT-4 Turbo vs GPT-OSS 20B

Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.

Quick Verdict

GPT-4 Turbo wins overall with a score of 50 vs 22 (28 point difference).GPT-4 Turbo wins 4 out of 4 categories.

GPT-4 Turbo

CreatorOpenAI
TypeProprietary
Context128K
Score50

GPT-OSS 20B

CreatorOpenAI
TypeOpen Weight
Context128K
Score22

Knowledge

GPT-4 Turbo

GPT-4 Turbo

58.5

GPT-OSS 20B

28.8

60
MMLU
31
60
GPQA
30
58
SuperGPQA
28
56
OpenBookQA
26

Coding

GPT-4 Turbo

GPT-4 Turbo

52

GPT-OSS 20B

23

52
HumanEval
23

Mathematics

GPT-4 Turbo

GPT-4 Turbo

59

GPT-OSS 20B

30

60
AIME 2023
31
62
AIME 2024
33
61
AIME 2025
32
56
HMMT Feb 2023
27
58
HMMT Feb 2024
29
57
HMMT Feb 2025
28
59
BRUMO 2025
30

Reasoning

GPT-4 Turbo

GPT-4 Turbo

57

GPT-OSS 20B

28

58
SimpleQA
29
56
MuSR
27

Frequently Asked Questions

Which is better, GPT-4 Turbo or GPT-OSS 20B?

GPT-4 Turbo scores higher overall with 50 vs 22, a difference of 28 points across all benchmarks.

Which is better for knowledge tasks, GPT-4 Turbo or GPT-OSS 20B?

GPT-4 Turbo leads in knowledge tasks with an average score of 58.5 vs 28.8.

Which is better for coding, GPT-4 Turbo or GPT-OSS 20B?

GPT-4 Turbo leads in coding with an average score of 52 vs 23.

Which is better for math, GPT-4 Turbo or GPT-OSS 20B?

GPT-4 Turbo leads in math with an average score of 59 vs 30.

Which is better for reasoning, GPT-4 Turbo or GPT-OSS 20B?

GPT-4 Turbo leads in reasoning with an average score of 57 vs 28.

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