Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Claude 4.1 Opus 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 4.1 Opus's sharpest advantage is in coding, where it averages 44 against 27.6. The single biggest benchmark swing on the page is SWE-bench Verified, 48 to 24.
Seed 1.6 Flash is the reasoning model in the pair, while Claude 4.1 Opus 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 4.1 Opus.
Pick Claude 4.1 Opus 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 4.1 Opus
58.7
Seed 1.6 Flash
54.5
Claude 4.1 Opus
44
Seed 1.6 Flash
27.6
Claude 4.1 Opus
80.7
Seed 1.6 Flash
73.1
Claude 4.1 Opus
72.9
Seed 1.6 Flash
66.8
Claude 4.1 Opus
57.6
Seed 1.6 Flash
47.3
Claude 4.1 Opus
83
Seed 1.6 Flash
81
Claude 4.1 Opus
81.8
Seed 1.6 Flash
72.8
Claude 4.1 Opus
77.7
Seed 1.6 Flash
67.1
Claude 4.1 Opus is ahead overall, 64 to 56. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 48 and 24.
Claude 4.1 Opus has the edge for knowledge tasks in this comparison, averaging 57.6 versus 47.3. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Claude 4.1 Opus has the edge for coding in this comparison, averaging 44 versus 27.6. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Claude 4.1 Opus has the edge for math in this comparison, averaging 77.7 versus 67.1. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
Claude 4.1 Opus has the edge for reasoning in this comparison, averaging 72.9 versus 66.8. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Claude 4.1 Opus has the edge for agentic tasks in this comparison, averaging 58.7 versus 54.5. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Claude 4.1 Opus has the edge for multimodal and grounded tasks in this comparison, averaging 80.7 versus 73.1. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Claude 4.1 Opus 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 4.1 Opus has the edge for multilingual tasks in this comparison, averaging 81.8 versus 72.8. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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