Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Claude 3.5 Sonnet is clearly ahead on the aggregate, 60 to 56. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude 3.5 Sonnet's sharpest advantage is in coding, where it averages 37.8 against 27.6. The single biggest benchmark swing on the page is LiveCodeBench, 39 to 25.
Seed 1.6 Flash is the reasoning model in the pair, while Claude 3.5 Sonnet is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Seed 1.6 Flash gives you the larger context window at 256K, compared with 200K for Claude 3.5 Sonnet.
Pick Claude 3.5 Sonnet if you want the stronger benchmark profile. Seed 1.6 Flash only becomes the better choice if you need the larger 256K context window or you want the stronger reasoning-first profile.
Claude 3.5 Sonnet
55
Seed 1.6 Flash
54.5
Claude 3.5 Sonnet
37.8
Seed 1.6 Flash
27.6
Claude 3.5 Sonnet
74.8
Seed 1.6 Flash
73.1
Claude 3.5 Sonnet
67.7
Seed 1.6 Flash
66.8
Claude 3.5 Sonnet
50.8
Seed 1.6 Flash
47.3
Claude 3.5 Sonnet
83
Seed 1.6 Flash
81
Claude 3.5 Sonnet
80.5
Seed 1.6 Flash
72.8
Claude 3.5 Sonnet
71.2
Seed 1.6 Flash
67.1
Claude 3.5 Sonnet is ahead overall, 60 to 56. The biggest single separator in this matchup is LiveCodeBench, where the scores are 39 and 25.
Claude 3.5 Sonnet has the edge for knowledge tasks in this comparison, averaging 50.8 versus 47.3. Inside this category, MMLU-Pro is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for coding in this comparison, averaging 37.8 versus 27.6. Inside this category, LiveCodeBench is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for math in this comparison, averaging 71.2 versus 67.1. Inside this category, MATH-500 is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for reasoning in this comparison, averaging 67.7 versus 66.8. Inside this category, BBH is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for agentic tasks in this comparison, averaging 55 versus 54.5. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for multimodal and grounded tasks in this comparison, averaging 74.8 versus 73.1. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for instruction following in this comparison, averaging 83 versus 81. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for multilingual tasks in this comparison, averaging 80.5 versus 72.8. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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