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Google: Gemini 3.5 Flash vs Z.ai: GLM 5.1

Summary

Gemini 3.5 Flash vs GLM 5.1 benchmark comparison: GLM 5.1 leads on average score with 7.1 vs 6.8. Gemini 3.5 Flash has the lower benchmark cost at $0.108 vs $0.395. Gemini 3.5 Flash is faster at 1.57s vs 33.67s, with pass rates of 68.3% vs 68.3%.

Recommended model: Gemini 3.5 Flash - Its score stays close to the best score here (6.8 vs 7.1), while costing about 3.7x less than GLM 5.1.

Last updated at: 2026-07-02

Metric Gemini 3.5 Flash Gemini 3.5 Flash minimal Release: 2026-05-19 GLM 5.1 GLM 5.1 medium Release: 2026-04-07
Score 6.8 7.1
Rank #74 #66
Reliability 10.0 6.7
Consistency 9.6 8.3
Tests Correct
Attempt pass rate 68.3% 68.3%
Flaky tests 1 4
Total Runs 63 63
Cost per result 0.767 2.496
Total Cost $0.108 $0.395
Input Price $1.500 / 1M $0.975 / 1M
Output Price $9.000 / 1M $4.301 / 1M
Total Input Tokens 39,847 32,995
Output Tokens 5,277 11,655
Reasoning Tokens 0 75,421
Response Time (avg) 1.57s 33.67s
Response Time (max) 5.51s 172.60s
Response Time (total) 33.02s 673.41s

Generation showcase

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#74 Gemini 3.5 Flash

minimal
Cost
$0.041
Time
20.4s
Tokens
4,608 tok

#66 GLM 5.1

medium
Invalid SVG
Cost
$0.000
Time
300.0s
Tokens
0 tok

Top Models by Score

Score vs Total Cost

Response Time (avg)

Score vs Response Time (avg)

Total Output Tokens

Score vs Total Output Tokens

Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 6.5 10.0 50.0% 0 892ms 492 405 0
GLM 5.1 10.0 10.0 100.0% 0 8.31s 555 401 5,122
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 5.6 9.9 33.3% 0 2.75s 8,122 3,456 0
GLM 5.1 4.6 3.7 44.5% 2 109.63s 5,702 4,871 37,826
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 3.0 10.0 0.0% 0 3.56s 15,780 404 0
GLM 5.1 9.5 10.0 100.0% 0 43.11s 17,298 327 4,206
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 1.66s 7,548 279 0
GLM 5.1 10.0 10.0 100.0% 0 9.33s 7,107 991 4,552
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 899ms 633 12 0
GLM 5.1 5.3 10.0 33.3% 0 29.77s 489 969 11,314
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 922ms 486 117 0
GLM 5.1 10.0 10.0 100.0% 0 20.95s 477 2,875 2,875
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 6.4 5.8 66.7% 1 893ms 615 76 0
GLM 5.1 6.4 5.8 66.7% 1 7.47s 634 204 1,617
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 1.45s 558 282 0
GLM 5.1 8.2 7.2 88.9% 1 31.64s 609 935 5,730
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.79s 5,457 234 0
GLM 5.1 3.0 10.0 0.0% 0 0ms 0 0 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 3.0 10.0 0.0% 0 1.76s 156 12 0
GLM 5.1 3.0 10.0 0.0% 0 29.40s 124 82 2,179

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