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Google: Gemini 3.5 Flash vs xAI: Grok 4.20

Last updated at: 2026-05-22

Metric Gemini 3.5 Flash Gemini 3.5 Flash low Release: 2026-05-19 Grok 4.20 Grok 4.20 none Release: 2026-03-31
Score 9.3 5.4
Rank #3 #120
Reliability 10.0 N/A
Consistency 10.0 9.5
Tests Correct
Attempt pass rate 90.0% 35.2%
Flaky tests 0 1
Total Runs 60 54
Cost per result 1.582 1.574
Total Cost $0.285 $0.095
Input Price $1.500 / 1M $1.250 / 1M
Output Price $9.000 / 1M $2.500 / 1M
Output Tokens 2,027 1,967
Reasoning Tokens 23,938 0
Response Time (avg) 2.98s 1.11s
Response Time (max) 6.44s 6.04s
Response Time (total) 59.59s 20.02s

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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) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.52s 209 2,536
Grok 4.20 4.8 10.0 25.0% 0 501ms 267 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 6.8 10.0 50.0% 0 5.54s 452 6,839
Grok 4.20 3.4 9.3 0.0% 0 1.22s 312 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 6.44s 351 3,050
Grok 4.20 3.0 10.0 0.0% 0 6.04s 282 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 1.81s 279 1,164
Grok 4.20 10.0 10.0 100.0% 0 522ms 207 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 7.7 10.0 66.7% 0 3.39s 12 4,538
Grok 4.20 3.0 10.0 0.0% 0 687ms 325 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.27s 119 916
Grok 4.20 4.8 10.0 0.0% 0 659ms 83 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 9.9 10.0 100.0% 0 1.86s 71 1,652
Grok 4.20 6.3 10.0 50.0% 0 455ms 60 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 2.35s 288 2,150
Grok 4.20 5.3 7.2 44.4% 1 487ms 242 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.27s 234 403
Grok 4.20 10.0 10.0 100.0% 0 4.63s 189 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 1.88s 12 690
Grok 4.20 - - - - - - - -

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