Gemini 3 Pro Deep Think vs Seed 1.6 Flash

Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.

Gemini 3 Pro Deep Think is clearly ahead on the aggregate, 81 to 56. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Gemini 3 Pro Deep Think's sharpest advantage is in coding, where it averages 60.3 against 27.6. The single biggest benchmark swing on the page is AIME 2023, 99 to 64.

Gemini 3 Pro Deep Think gives you the larger context window at 2M, compared with 256K for Seed 1.6 Flash.

Quick Verdict

Pick Gemini 3 Pro Deep Think if you want the stronger benchmark profile. Seed 1.6 Flash only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.

Agentic

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

78.1

Seed 1.6 Flash

54.5

77
Terminal-Bench 2.0
52
87
BrowseComp
62
73
OSWorld-Verified
52

Coding

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

60.3

Seed 1.6 Flash

27.6

91
HumanEval
59
58
SWE-bench Verified
24
58
LiveCodeBench
25
63
SWE-bench Pro
31

Multimodal & Grounded

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

95

Seed 1.6 Flash

73.1

95
MMMU-Pro
74
95
OfficeQA Pro
72

Reasoning

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

94.5

Seed 1.6 Flash

66.8

95
SimpleQA
61
93
MuSR
59
95
BBH
75
94
LongBench v2
70
96
MRCRv2
74

Knowledge

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

74.7

Seed 1.6 Flash

47.3

99
MMLU
65
97
GPQA
64
95
SuperGPQA
62
93
OpenBookQA
60
81
MMLU-Pro
65
32
HLE
3
88
FrontierScience
57

Instruction Following

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

89

Seed 1.6 Flash

81

89
IFEval
81

Multilingual

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

87.4

Seed 1.6 Flash

72.8

92
MGSM
76
85
MMLU-ProX
71

Mathematics

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

94.5

Seed 1.6 Flash

67.1

99
AIME 2023
64
99
AIME 2024
66
98
AIME 2025
65
95
HMMT Feb 2023
60
97
HMMT Feb 2024
62
96
HMMT Feb 2025
61
96
BRUMO 2025
63
92
MATH-500
72

Frequently Asked Questions

Which is better, Gemini 3 Pro Deep Think or Seed 1.6 Flash?

Gemini 3 Pro Deep Think is ahead overall, 81 to 56. The biggest single separator in this matchup is AIME 2023, where the scores are 99 and 64.

Which is better for knowledge tasks, Gemini 3 Pro Deep Think or Seed 1.6 Flash?

Gemini 3 Pro Deep Think has the edge for knowledge tasks in this comparison, averaging 74.7 versus 47.3. Inside this category, MMLU is the benchmark that creates the most daylight between them.

Which is better for coding, Gemini 3 Pro Deep Think or Seed 1.6 Flash?

Gemini 3 Pro Deep Think has the edge for coding in this comparison, averaging 60.3 versus 27.6. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.

Which is better for math, Gemini 3 Pro Deep Think or Seed 1.6 Flash?

Gemini 3 Pro Deep Think has the edge for math in this comparison, averaging 94.5 versus 67.1. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.

Which is better for reasoning, Gemini 3 Pro Deep Think or Seed 1.6 Flash?

Gemini 3 Pro Deep Think has the edge for reasoning in this comparison, averaging 94.5 versus 66.8. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, Gemini 3 Pro Deep Think or Seed 1.6 Flash?

Gemini 3 Pro Deep Think has the edge for agentic tasks in this comparison, averaging 78.1 versus 54.5. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, Gemini 3 Pro Deep Think or Seed 1.6 Flash?

Gemini 3 Pro Deep Think has the edge for multimodal and grounded tasks in this comparison, averaging 95 versus 73.1. Inside this category, OfficeQA Pro is the benchmark that creates the most daylight between them.

Which is better for instruction following, Gemini 3 Pro Deep Think or Seed 1.6 Flash?

Gemini 3 Pro Deep Think has the edge for instruction following in this comparison, averaging 89 versus 81. Inside this category, IFEval is the benchmark that creates the most daylight between them.

Which is better for multilingual tasks, Gemini 3 Pro Deep Think or Seed 1.6 Flash?

Gemini 3 Pro Deep Think has the edge for multilingual tasks in this comparison, averaging 87.4 versus 72.8. Inside this category, MGSM is the benchmark that creates the most daylight between them.

Last updated: March 12, 2026

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