GLM-5 (Reasoning) vs Seed 1.6 Flash

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

GLM-5 (Reasoning) is clearly ahead on the aggregate, 78 to 56. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

GLM-5 (Reasoning)'s sharpest advantage is in coding, where it averages 62.5 against 27.6. The single biggest benchmark swing on the page is SWE-bench Verified, 62 to 24.

Seed 1.6 Flash gives you the larger context window at 256K, compared with 200K for GLM-5 (Reasoning).

Quick Verdict

Pick GLM-5 (Reasoning) if you want the stronger benchmark profile. Seed 1.6 Flash only becomes the better choice if you need the larger 256K context window.

Agentic

GLM-5 (Reasoning)

GLM-5 (Reasoning)

78.3

Seed 1.6 Flash

54.5

81
Terminal-Bench 2.0
52
80
BrowseComp
62
74
OSWorld-Verified
52

Coding

GLM-5 (Reasoning)

GLM-5 (Reasoning)

62.5

Seed 1.6 Flash

27.6

88
HumanEval
59
62
SWE-bench Verified
24
58
LiveCodeBench
25
67
SWE-bench Pro
31

Multimodal & Grounded

GLM-5 (Reasoning)

GLM-5 (Reasoning)

78.5

Seed 1.6 Flash

73.1

74
MMMU-Pro
74
84
OfficeQA Pro
72

Reasoning

GLM-5 (Reasoning)

GLM-5 (Reasoning)

88.9

Seed 1.6 Flash

66.8

92
SimpleQA
61
90
MuSR
59
91
BBH
75
86
LongBench v2
70
87
MRCRv2
74

Knowledge

GLM-5 (Reasoning)

GLM-5 (Reasoning)

72

Seed 1.6 Flash

47.3

96
MMLU
65
94
GPQA
64
92
SuperGPQA
62
90
OpenBookQA
60
81
MMLU-Pro
65
29
HLE
3
83
FrontierScience
57

Instruction Following

GLM-5 (Reasoning)

GLM-5 (Reasoning)

92

Seed 1.6 Flash

81

92
IFEval
81

Multilingual

GLM-5 (Reasoning)

GLM-5 (Reasoning)

86.4

Seed 1.6 Flash

72.8

89
MGSM
76
85
MMLU-ProX
71

Mathematics

GLM-5 (Reasoning)

GLM-5 (Reasoning)

94.4

Seed 1.6 Flash

67.1

98
AIME 2023
64
99
AIME 2024
66
98
AIME 2025
65
94
HMMT Feb 2023
60
96
HMMT Feb 2024
62
95
HMMT Feb 2025
61
96
BRUMO 2025
63
92
MATH-500
72

Frequently Asked Questions

Which is better, GLM-5 (Reasoning) or Seed 1.6 Flash?

GLM-5 (Reasoning) is ahead overall, 78 to 56. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 62 and 24.

Which is better for knowledge tasks, GLM-5 (Reasoning) or Seed 1.6 Flash?

GLM-5 (Reasoning) has the edge for knowledge tasks in this comparison, averaging 72 versus 47.3. Inside this category, MMLU is the benchmark that creates the most daylight between them.

Which is better for coding, GLM-5 (Reasoning) or Seed 1.6 Flash?

GLM-5 (Reasoning) has the edge for coding in this comparison, averaging 62.5 versus 27.6. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.

Which is better for math, GLM-5 (Reasoning) or Seed 1.6 Flash?

GLM-5 (Reasoning) has the edge for math in this comparison, averaging 94.4 versus 67.1. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.

Which is better for reasoning, GLM-5 (Reasoning) or Seed 1.6 Flash?

GLM-5 (Reasoning) has the edge for reasoning in this comparison, averaging 88.9 versus 66.8. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, GLM-5 (Reasoning) or Seed 1.6 Flash?

GLM-5 (Reasoning) has the edge for agentic tasks in this comparison, averaging 78.3 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, GLM-5 (Reasoning) or Seed 1.6 Flash?

GLM-5 (Reasoning) has the edge for multimodal and grounded tasks in this comparison, averaging 78.5 versus 73.1. Inside this category, OfficeQA Pro is the benchmark that creates the most daylight between them.

Which is better for instruction following, GLM-5 (Reasoning) or Seed 1.6 Flash?

GLM-5 (Reasoning) has the edge for instruction following in this comparison, averaging 92 versus 81. Inside this category, IFEval is the benchmark that creates the most daylight between them.

Which is better for multilingual tasks, GLM-5 (Reasoning) or Seed 1.6 Flash?

GLM-5 (Reasoning) has the edge for multilingual tasks in this comparison, averaging 86.4 versus 72.8. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.

Last updated: March 12, 2026

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