Claude 3 Opus vs GPT-4o mini

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

Claude 3 Opus is clearly ahead on the aggregate, 53 to 43. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Claude 3 Opus gives you the larger context window at 200K, compared with 128K for GPT-4o mini.

Quick Verdict

Pick Claude 3 Opus if you want the stronger benchmark profile. GPT-4o mini only becomes the better choice if coding is the priority.

Knowledge

GPT-4o mini

Claude 3 Opus

50.2

GPT-4o mini

82

61
MMLU
82
61
GPQA
-
59
SuperGPQA
-
57
OpenBookQA
-
62
MMLU-Pro
-
1
HLE
-

Coding

GPT-4o mini

Claude 3 Opus

27.7

GPT-4o mini

87.2

53
HumanEval
87.2
10
SWE-bench Verified
-
20
LiveCodeBench
-

Mathematics

Claude 3 Opus
61
AIME 2023
-
63
AIME 2024
-
62
AIME 2025
-
57
HMMT Feb 2023
-
59
HMMT Feb 2024
-
58
HMMT Feb 2025
-
60
BRUMO 2025
-
73
MATH-500
-

Reasoning

Claude 3 Opus
59
SimpleQA
-
57
MuSR
-
74
BBH
-

Instruction Following

Claude 3 Opus
77
IFEval
-

Multilingual

GPT-4o mini

Claude 3 Opus

73

GPT-4o mini

87

73
MGSM
87

Frequently Asked Questions

Which is better, Claude 3 Opus or GPT-4o mini?

Claude 3 Opus is ahead overall, 53 to 43. The biggest single separator in this matchup is HumanEval, where the scores are 53 and 87.2.

Which is better for knowledge tasks, Claude 3 Opus or GPT-4o mini?

GPT-4o mini has the edge for knowledge tasks in this comparison, averaging 82 versus 50.2. Inside this category, MMLU is the benchmark that creates the most daylight between them.

Which is better for coding, Claude 3 Opus or GPT-4o mini?

GPT-4o mini has the edge for coding in this comparison, averaging 87.2 versus 27.7. Inside this category, HumanEval is the benchmark that creates the most daylight between them.

Which is better for multilingual tasks, Claude 3 Opus or GPT-4o mini?

GPT-4o mini has the edge for multilingual tasks in this comparison, averaging 87 versus 73. Inside this category, MGSM is the benchmark that creates the most daylight between them.

Last updated: March 9, 2026

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