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Google: Gemini 3.5 Flash vs xAI: Grok 4.20

Summary

Gemini 3.5 Flash vs Grok 4.20 benchmark comparison: Grok 4.20 leads on average score with 7.3 vs 7.0. Grok 4.20 has the lower benchmark cost at $0.609 vs $1.079. Gemini 3.5 Flash is faster at 9.93s vs 27.68s, with pass rates of 77.8% vs 63.5%.

Recommended model: Grok 4.20 - It has the best score here (7.3), while costing about 1.8x less than Gemini 3.5 Flash.

Last updated at: 2026-06-18

Metric Gemini 3.5 Flash Gemini 3.5 Flash none Release: 2026-05-19 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 7.0 7.3
Rank #66 #53
Reliability 10.0 10.0
Consistency 8.9 8.8
Tests Correct
Attempt pass rate 77.8% 63.5%
Flaky tests 3 3
Total Runs 63 63
Cost per result 7.190 8.309
Total Cost $1.079 $0.609
Input Price $1.500 / 1M $1.250 / 1M
Output Price $9.000 / 1M $2.500 / 1M
Total Input Tokens 13,843 44,433
Output Tokens 117,518 1,819
Reasoning Tokens 0 219,524
Response Time (avg) 9.93s 27.68s
Response Time (max) 64.36s 199.66s
Response Time (total) 178.68s 581.26s

Generation showcase

Hamster playing table tennis

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

#66 Gemini 3.5 Flash

none
Cost
$0.225
Time
125.5s
Tokens
25,004 tok

#53 xAI: Grok 4.20

medium
Cost
$0.041
Time
110.3s
Tokens
16,336 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 2.53s 492 5,101 0
Grok 4.20 8.2 7.9 83.3% 1 3.95s 2,010 287 8,312
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 8.8 7.8 88.9% 1 34.69s 8,122 75,927 0
Grok 4.20 6.3 6.6 55.6% 1 109.93s 8,307 268 103,150
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 0ms 0 0 0
Grok 4.20 10.0 10.0 100.0% 0 17.40s 12,909 232 9,556
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 6.5 10.0 50.0% 0 8.10s 2,781 5,895 0
Grok 4.20 10.0 10.0 100.0% 0 4.17s 7,761 180 5,333
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 10.64s 633 17,910 0
Grok 4.20 5.3 10.0 33.3% 0 27.03s 1,764 375 49,339
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 3.46s 486 1,620 0
Grok 4.20 3.9 2.6 33.3% 1 24.48s 825 65 6,440
Instructions following 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 3.38s 615 3,928 0
Grok 4.20 9.8 10.0 100.0% 0 4.26s 1,362 57 6,419
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 3.13s 558 4,640 0
Grok 4.20 7.7 10.0 66.7% 0 6.22s 1,689 149 7,913
Tool Calling 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 0ms 0 0 0
Grok 4.20 3.0 10.0 0.0% 0 13.68s 7,275 197 6,620
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 2.8 1.6 33.3% 1 4.87s 156 2,497 0
Grok 4.20 3.0 10.0 0.0% 0 63.48s 531 9 16,442

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