benchlm.ai

Claude Sonnet 4.5 vs DeepSeek V3.1 (Reasoning)

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

Quick Verdict

Claude Sonnet 4.5 wins overall with a score of 74 vs 25 (49 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

DeepSeek V3.1 (Reasoning)

CreatorDeepSeek
TypeOpen Weight
Context128K
Score25

Knowledge

Claude Sonnet 4.5

Claude Sonnet 4.5

92

DeepSeek V3.1 (Reasoning)

31.8

95
MMLU
34
93
GPQA
33
91
SuperGPQA
31
89
OpenBookQA
29

Coding

Claude Sonnet 4.5

Claude Sonnet 4.5

87

DeepSeek V3.1 (Reasoning)

26

87
HumanEval
26

Mathematics

Claude Sonnet 4.5

Claude Sonnet 4.5

96

DeepSeek V3.1 (Reasoning)

33

97
AIME 2023
34
99
AIME 2024
36
98
AIME 2025
35
93
HMMT Feb 2023
30
95
HMMT Feb 2024
32
94
HMMT Feb 2025
31
96
BRUMO 2025
33

Reasoning

Claude Sonnet 4.5

Claude Sonnet 4.5

90

DeepSeek V3.1 (Reasoning)

31

91
SimpleQA
32
89
MuSR
30

Frequently Asked Questions

Which is better, Claude Sonnet 4.5 or DeepSeek V3.1 (Reasoning)?

Claude Sonnet 4.5 scores higher overall with 74 vs 25, a difference of 49 points across all benchmarks.

Which is better for knowledge tasks, Claude Sonnet 4.5 or DeepSeek V3.1 (Reasoning)?

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 31.8.

Which is better for coding, Claude Sonnet 4.5 or DeepSeek V3.1 (Reasoning)?

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 26.

Which is better for math, Claude Sonnet 4.5 or DeepSeek V3.1 (Reasoning)?

Claude Sonnet 4.5 leads in math with an average score of 96 vs 33.

Which is better for reasoning, Claude Sonnet 4.5 or DeepSeek V3.1 (Reasoning)?

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 31.

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