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Google: Gemini 3.1 Pro Preview vs Google: Gemini 3.5 Flash

Last updated at: 2026-05-19

Metric Gemini 3.1 Pro Preview Gemini 3.1 Pro Preview medium Release: 2026-02-19 Gemini 3.5 Flash Gemini 3.5 Flash medium Release: 2026-05-19
Score 9.6 9.2
Rank #3 #5
Reliability 10.0 10.0
Consistency 10.0 10.0
Tests Correct
Attempt pass rate 94.7% 89.5%
Flaky tests 0 0
Total Runs 57 57
Cost per result 3.300 2.307
Total Cost $0.594 $0.393
Input Price $2.000 / 1M $1.500 / 1M
Output Price $12.000 / 1M $9.000 / 1M
Output Tokens 1,944 1,971
Reasoning Tokens 41,839 36,659
Response Time (avg) 15.15s 3.90s
Response Time (max) 40.61s 12.05s
Response Time (total) 181.78s 74.13s

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Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 7.90s 112 3,218
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.09s 171 3,385
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 19.88s 405 4,201
Gemini 3.5 Flash 10.0 10.0 100.0% 0 8.22s 431 5,190
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 9.5 10.0 100.0% 0 40.61s 432 9,281
Gemini 3.5 Flash 10.0 10.0 100.0% 0 12.05s 351 7,807
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 7.72s 279 3,904
Gemini 3.5 Flash 10.0 10.0 100.0% 0 4.07s 279 3,784
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 7.7 10.0 66.7% 0 32.73s 18 12,424
Gemini 3.5 Flash 7.7 10.0 66.7% 0 5.24s 12 8,047
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 11.77s 108 1,179
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.52s 115 1,144
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 9.56s 72 2,236
Gemini 3.5 Flash 9.9 10.0 100.0% 0 2.70s 71 2,855
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 7.15s 232 3,117
Gemini 3.5 Flash 7.7 10.0 66.7% 0 2.38s 295 2,747
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 23.15s 274 982
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.81s 234 455
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 6.27s 12 1,297
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.75s 12 1,245

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