Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Claude Opus 4.6 is clearly ahead on the aggregate, 85 to 56. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.6's sharpest advantage is in coding, where it averages 75.1 against 27.6. The single biggest benchmark swing on the page is SWE-bench Verified, 80 to 24.
Claude Opus 4.6 is also the more expensive model on tokens at $15.00 input / $75.00 output per 1M tokens, versus $0.08 input / $0.30 output per 1M tokens for Seed 1.6 Flash. That is roughly 250.0x on output cost alone. Seed 1.6 Flash is the reasoning model in the pair, while Claude Opus 4.6 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. Claude Opus 4.6 gives you the larger context window at 1M, compared with 256K for Seed 1.6 Flash.
Pick Claude Opus 4.6 if you want the stronger benchmark profile. Seed 1.6 Flash only becomes the better choice if you want the cheaper token bill or you want the stronger reasoning-first profile.
Claude Opus 4.6
79.2
Seed 1.6 Flash
54.5
Claude Opus 4.6
75.1
Seed 1.6 Flash
27.6
Claude Opus 4.6
94.6
Seed 1.6 Flash
73.1
Claude Opus 4.6
93.1
Seed 1.6 Flash
66.8
Claude Opus 4.6
78.9
Seed 1.6 Flash
47.3
Claude Opus 4.6
95
Seed 1.6 Flash
81
Claude Opus 4.6
94.7
Seed 1.6 Flash
72.8
Claude Opus 4.6
97.2
Seed 1.6 Flash
67.1
Claude Opus 4.6 is ahead overall, 85 to 56. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 80 and 24.
Claude Opus 4.6 has the edge for knowledge tasks in this comparison, averaging 78.9 versus 47.3. Inside this category, HLE is the benchmark that creates the most daylight between them.
Claude Opus 4.6 has the edge for coding in this comparison, averaging 75.1 versus 27.6. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Claude Opus 4.6 has the edge for math in this comparison, averaging 97.2 versus 67.1. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
Claude Opus 4.6 has the edge for reasoning in this comparison, averaging 93.1 versus 66.8. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Claude Opus 4.6 has the edge for agentic tasks in this comparison, averaging 79.2 versus 54.5. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Claude Opus 4.6 has the edge for multimodal and grounded tasks in this comparison, averaging 94.6 versus 73.1. Inside this category, OfficeQA Pro is the benchmark that creates the most daylight between them.
Claude Opus 4.6 has the edge for instruction following in this comparison, averaging 95 versus 81. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Claude Opus 4.6 has the edge for multilingual tasks in this comparison, averaging 94.7 versus 72.8. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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