benchlm.ai

Claude 3 Haiku vs GPT-5.1-Codex-Max

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

Quick Verdict

GPT-5.1-Codex-Max wins overall with a score of 77 vs 46 (31 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

Claude 3 Haiku

CreatorAnthropic
TypeProprietary
Context200K
Score46

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Knowledge

GPT-5.1-Codex-Max

Claude 3 Haiku

54.5

GPT-5.1-Codex-Max

95

56
MMLU
98
56
GPQA
96
54
SuperGPQA
94
52
OpenBookQA
92

Coding

GPT-5.1-Codex-Max

Claude 3 Haiku

48

GPT-5.1-Codex-Max

94

48
HumanEval
94

Mathematics

GPT-5.1-Codex-Max

Claude 3 Haiku

55

GPT-5.1-Codex-Max

97.1

56
AIME 2023
99
58
AIME 2024
99
57
AIME 2025
98
52
HMMT Feb 2023
95
54
HMMT Feb 2024
97
53
HMMT Feb 2025
96
55
BRUMO 2025
96

Reasoning

GPT-5.1-Codex-Max

Claude 3 Haiku

53

GPT-5.1-Codex-Max

93

54
SimpleQA
94
52
MuSR
92

Frequently Asked Questions

Which is better, Claude 3 Haiku or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max scores higher overall with 77 vs 46, a difference of 31 points across all benchmarks.

Which is better for knowledge tasks, Claude 3 Haiku or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 54.5.

Which is better for coding, Claude 3 Haiku or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 48.

Which is better for math, Claude 3 Haiku or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 55.

Which is better for reasoning, Claude 3 Haiku or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 53.

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