GPT-OSS 120B vs Grok 3 [Beta]

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

Quick Verdict

GPT-OSS 120B wins overall with a score of 42 vs 33 (9 point difference).GPT-OSS 120B wins 4 out of 4 categories.

Knowledge

GPT-OSS 120B

GPT-OSS 120B

48.8

Grok 3 [Beta]

39.8

51
MMLU
42
50
GPQA
41
48
SuperGPQA
39
46
OpenBookQA
37

Coding

GPT-OSS 120B

GPT-OSS 120B

43

Grok 3 [Beta]

34

43
HumanEval
34

Mathematics

GPT-OSS 120B

GPT-OSS 120B

50

Grok 3 [Beta]

41

51
AIME 2023
42
53
AIME 2024
44
52
AIME 2025
43
47
HMMT Feb 2023
38
49
HMMT Feb 2024
40
48
HMMT Feb 2025
39
50
BRUMO 2025
41

Reasoning

GPT-OSS 120B

GPT-OSS 120B

48

Grok 3 [Beta]

39

49
SimpleQA
40
47
MuSR
38

Frequently Asked Questions

Which is better, GPT-OSS 120B or Grok 3 [Beta]?

GPT-OSS 120B scores higher overall with 42 vs 33, a difference of 9 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 120B or Grok 3 [Beta]?

GPT-OSS 120B leads in knowledge tasks with an average score of 48.8 vs 39.8.

Which is better for coding, GPT-OSS 120B or Grok 3 [Beta]?

GPT-OSS 120B leads in coding with an average score of 43 vs 34.

Which is better for math, GPT-OSS 120B or Grok 3 [Beta]?

GPT-OSS 120B leads in math with an average score of 50 vs 41.

Which is better for reasoning, GPT-OSS 120B or Grok 3 [Beta]?

GPT-OSS 120B leads in reasoning with an average score of 48 vs 39.