GPT-OSS 20B vs Llama 3 70B

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

Quick Verdict

Llama 3 70B wins overall with a score of 48 vs 22 (26 point difference).Llama 3 70B wins 4 out of 4 categories.

Knowledge

Llama 3 70B

GPT-OSS 20B

28.8

Llama 3 70B

56.5

31
MMLU
58
30
GPQA
58
28
SuperGPQA
56
26
OpenBookQA
54

Coding

Llama 3 70B

GPT-OSS 20B

23

Llama 3 70B

50

23
HumanEval
50

Mathematics

Llama 3 70B

GPT-OSS 20B

30

Llama 3 70B

57

31
AIME 2023
58
33
AIME 2024
60
32
AIME 2025
59
27
HMMT Feb 2023
54
29
HMMT Feb 2024
56
28
HMMT Feb 2025
55
30
BRUMO 2025
57

Reasoning

Llama 3 70B

GPT-OSS 20B

28

Llama 3 70B

55

29
SimpleQA
56
27
MuSR
54

Frequently Asked Questions

Which is better, GPT-OSS 20B or Llama 3 70B?

Llama 3 70B scores higher overall with 48 vs 22, a difference of 26 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 20B or Llama 3 70B?

Llama 3 70B leads in knowledge tasks with an average score of 56.5 vs 28.8.

Which is better for coding, GPT-OSS 20B or Llama 3 70B?

Llama 3 70B leads in coding with an average score of 50 vs 23.

Which is better for math, GPT-OSS 20B or Llama 3 70B?

Llama 3 70B leads in math with an average score of 57 vs 30.

Which is better for reasoning, GPT-OSS 20B or Llama 3 70B?

Llama 3 70B leads in reasoning with an average score of 55 vs 28.