Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Claude 4 Sonnet is clearly ahead on the aggregate, 64 to 56. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude 4 Sonnet's sharpest advantage is in coding, where it averages 42.9 against 27.6. The single biggest benchmark swing on the page is SWE-bench Verified, 51 to 24.
Seed 1.6 Flash is the reasoning model in the pair, while Claude 4 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 4 Sonnet.
Pick Claude 4 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 4 Sonnet
57.9
Seed 1.6 Flash
54.5
Claude 4 Sonnet
42.9
Seed 1.6 Flash
27.6
Claude 4 Sonnet
79.7
Seed 1.6 Flash
73.1
Claude 4 Sonnet
71.8
Seed 1.6 Flash
66.8
Claude 4 Sonnet
56.8
Seed 1.6 Flash
47.3
Claude 4 Sonnet
83
Seed 1.6 Flash
81
Claude 4 Sonnet
82.1
Seed 1.6 Flash
72.8
Claude 4 Sonnet
76.1
Seed 1.6 Flash
67.1
Claude 4 Sonnet is ahead overall, 64 to 56. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 51 and 24.
Claude 4 Sonnet has the edge for knowledge tasks in this comparison, averaging 56.8 versus 47.3. Inside this category, MMLU-Pro is the benchmark that creates the most daylight between them.
Claude 4 Sonnet has the edge for coding in this comparison, averaging 42.9 versus 27.6. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Claude 4 Sonnet has the edge for math in this comparison, averaging 76.1 versus 67.1. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
Claude 4 Sonnet has the edge for reasoning in this comparison, averaging 71.8 versus 66.8. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Claude 4 Sonnet has the edge for agentic tasks in this comparison, averaging 57.9 versus 54.5. Inside this category, OSWorld-Verified is the benchmark that creates the most daylight between them.
Claude 4 Sonnet has the edge for multimodal and grounded tasks in this comparison, averaging 79.7 versus 73.1. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Claude 4 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 4 Sonnet has the edge for multilingual tasks in this comparison, averaging 82.1 versus 72.8. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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