Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Seed 1.6 Flash is clearly ahead on the aggregate, 56 to 49. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Seed 1.6 Flash's sharpest advantage is in agentic, where it averages 54.5 against 46.5. The single biggest benchmark swing on the page is HumanEval, 59 to 42.
Gemini 2.5 Flash is also the more expensive model on tokens at $0.15 input / $0.60 output per 1M tokens, versus $0.08 input / $0.30 output per 1M tokens for Seed 1.6 Flash. That is roughly 2.0x on output cost alone. Seed 1.6 Flash is the reasoning model in the pair, while Gemini 2.5 Flash 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. Gemini 2.5 Flash gives you the larger context window at 1M, compared with 256K for Seed 1.6 Flash.
Pick Seed 1.6 Flash if you want the stronger benchmark profile. Gemini 2.5 Flash only becomes the better choice if you need the larger 1M context window or you would rather avoid the extra latency and token burn of a reasoning model.
Seed 1.6 Flash
54.5
Gemini 2.5 Flash
46.5
Seed 1.6 Flash
27.6
Gemini 2.5 Flash
21.7
Seed 1.6 Flash
73.1
Gemini 2.5 Flash
67.7
Seed 1.6 Flash
66.8
Gemini 2.5 Flash
59.2
Seed 1.6 Flash
47.3
Gemini 2.5 Flash
40.5
Seed 1.6 Flash
81
Gemini 2.5 Flash
79
Seed 1.6 Flash
72.8
Gemini 2.5 Flash
70.8
Seed 1.6 Flash
67.1
Gemini 2.5 Flash
59.4
Seed 1.6 Flash is ahead overall, 56 to 49. The biggest single separator in this matchup is HumanEval, where the scores are 59 and 42.
Seed 1.6 Flash has the edge for knowledge tasks in this comparison, averaging 47.3 versus 40.5. Inside this category, MMLU is the benchmark that creates the most daylight between them.
Seed 1.6 Flash has the edge for coding in this comparison, averaging 27.6 versus 21.7. Inside this category, HumanEval is the benchmark that creates the most daylight between them.
Seed 1.6 Flash has the edge for math in this comparison, averaging 67.1 versus 59.4. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
Seed 1.6 Flash has the edge for reasoning in this comparison, averaging 66.8 versus 59.2. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Seed 1.6 Flash has the edge for agentic tasks in this comparison, averaging 54.5 versus 46.5. Inside this category, OSWorld-Verified is the benchmark that creates the most daylight between them.
Seed 1.6 Flash has the edge for multimodal and grounded tasks in this comparison, averaging 73.1 versus 67.7. Inside this category, OfficeQA Pro is the benchmark that creates the most daylight between them.
Seed 1.6 Flash has the edge for instruction following in this comparison, averaging 81 versus 79. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Seed 1.6 Flash has the edge for multilingual tasks in this comparison, averaging 72.8 versus 70.8. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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