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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: Gemini 3.5 Flash leads on average score with 9.2 vs 7.3. Gemini 3.5 Flash has the lower benchmark cost at $0.349 vs $0.609. Gemini 3.5 Flash is faster at 3.27s vs 27.68s, with pass rates of 90.5% vs 63.5%.

Recommended model: Gemini 3.5 Flash - It has the best score here (9.2), while costing about 1.7x less than Grok 4.20.

Last updated at: 2026-06-18

Metric Gemini 3.5 Flash Gemini 3.5 Flash low Release: 2026-05-19 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 9.2 7.3
Rank #5 #53
Reliability 10.0 10.0
Consistency 10.0 8.8
Tests Correct
Attempt pass rate 90.5% 63.5%
Flaky tests 0 3
Total Runs 63 63
Cost per result 1.834 8.309
Total Cost $0.349 $0.609
Input Price $1.500 / 1M $1.250 / 1M
Output Price $9.000 / 1M $2.500 / 1M
Total Input Tokens 36,938 44,433
Output Tokens 2,033 1,819
Reasoning Tokens 30,519 219,524
Response Time (avg) 3.27s 27.68s
Response Time (max) 9.05s 199.66s
Response Time (total) 68.65s 581.26s

Generation showcase

Hamster playing table tennis

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

#5 Gemini 3.5 Flash

low
Cost
$0.068
Time
39.1s
Tokens
7,588 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 2.52s 494 209 2,536
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 7.8 10.0 66.7% 0 6.71s 8,118 458 13,420
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 10.0 10.0 100.0% 0 6.44s 12,873 351 3,050
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 10.0 10.0 100.0% 0 1.81s 7,548 279 1,164
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 7.7 10.0 66.7% 0 3.39s 633 12 4,538
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 2.27s 486 119 916
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 9.9 10.0 100.0% 0 1.86s 615 71 1,652
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 2.35s 558 288 2,150
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 10.0 10.0 100.0% 0 3.27s 5,457 234 403
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 10.0 10.0 100.0% 0 1.88s 156 12 690
Grok 4.20 3.0 10.0 0.0% 0 63.48s 531 9 16,442

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