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Google: Gemini 3.5 Flash vs Grok 4.1 Fast

Summary

Gemini 3.5 Flash vs Grok 4.1 Fast benchmark comparison: Gemini 3.5 Flash leads on average score with 9.8 vs 5.6. Grok 4.1 Fast has the lower benchmark cost at $0.069 vs $1.115. Gemini 3.5 Flash is faster at 8.84s vs 23.85s, with pass rates of 96.8% vs 55.6%.

Recommended model: Gemini 3.5 Flash - It has the best score here (9.8), while responding about 2.7x faster than Grok 4.1 Fast.

Last updated at: 2026-07-02

Metric Gemini 3.5 Flash Gemini 3.5 Flash high Release: 2026-05-19 Grok 4.1 Fast Grok 4.1 Fast medium Release: 2025-11-19
Score 9.8 5.6
Rank #1 #119
Reliability 10.0 10.0
Consistency 9.6 6.6
Tests Correct
Attempt pass rate 96.8% 55.6%
Flaky tests 1 6
Total Runs 63 57
Cost per result 5.575 0.642
Total Cost $1.115 $0.069
Input Price $1.500 / 1M $0.484 / 1M
Output Price $9.000 / 1M $0.484 / 1M
Total Input Tokens 37,594 42,845
Output Tokens 1,975 2,006
Reasoning Tokens 115,638 96,334
Response Time (avg) 8.84s 23.85s
Response Time (max) 34.82s 121.79s
Response Time (total) 185.57s 286.16s

Generation showcase

Hamster playing table tennis

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

#1 Gemini 3.5 Flash

high
Cost
$0.208
Time
118.2s
Tokens
23,158 tok

#119 Grok 4.1 Fast

medium
Grok 4.1 Fast is deprecated. xAI recommends switching to Grok 4.3 (https://openrouter.ai/x-ai/grok-4.3)
Cost
$0.000
Time
0.1s
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 10.0 10.0 100.0% 0 2.57s 492 174 4,997
Grok 4.1 Fast 8.7 7.9 91.7% 1 3.81s 2,358 108 4,741
Coding 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 22.96s 8,118 456 47,129
Grok 4.1 Fast 7.8 4.0 11.1% 1 23.58s 1,167 821 6,703
Combined 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 22.37s 12,873 351 16,323
Grok 4.1 Fast 10.0 10.0 100.0% 0 37.64s 13,899 261 12,272
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 6.43s 7,548 279 8,466
Grok 4.1 Fast 10.0 10.0 100.0% 0 6.63s 8,001 180 5,409
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 7.6 7.2 77.8% 1 14.09s 633 12 24,721
Grok 4.1 Fast 5.8 4.4 66.7% 2 121.79s 1,777 11 37,657
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 3.63s 486 115 1,650
Grok 4.1 Fast 4.2 9.9 0.0% 0 16.25s 912 127 3,456
Instructions following 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 3.35s 615 70 3,799
Grok 4.1 Fast 6.5 10.0 50.0% 0 4.63s 1,536 54 3,326
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 3.23s 558 241 4,940
Grok 4.1 Fast 5.3 7.2 44.4% 1 7.40s 1,950 169 5,904
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 9.8 10.0 100.0% 0 4.96s 6,115 265 1,608
Grok 4.1 Fast 2.8 1.6 33.3% 1 27.71s 10,627 260 11,485
Trivia 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 3.94s 156 12 2,005
Grok 4.1 Fast 3.0 10.0 0.0% 0 25.52s 618 15 5,381

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