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Google: Gemini 2.5 Flash vs xAI: Grok 4.20

Last updated at: 2026-04-16

Metric Gemini 2.5 Flash Gemini 2.5 Flash none Release: 2025-06-17 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 6.2 7.0
Rank #61 #46
Consistency 9.2 7.8
Tests Correct
Attempt pass rate 44.4% 66.7%
Flaky tests 2 5
Total Runs 54 54
Cost per result 0.184 8.252
Total Cost $0.013 $0.743
Input Price $0.300 / 1M $2.000 / 1M
Output Price $2.500 / 1M $6.000 / 1M
Output Tokens 1,726 1,744
Reasoning Tokens 0 109,882
Response Time (avg) 903ms 10.33s
Response Time (max) 4.39s 29.87s
Response Time (total) 16.26s 185.87s

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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 2.5 Flash 3.0 10.0 0.0% 0 582ms 102 0
Grok 4.20 8.2 7.9 83.3% 1 3.36s 280 8,476
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 1.16s 453 0
Grok 4.20 4.3 1.1 66.7% 1 24.33s 250 12,804
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 3.0 10.0 0.0% 0 4.39s 366 0
Grok 4.20 10.0 10.0 100.0% 0 17.40s 232 9,556
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 652ms 279 0
Grok 4.20 10.0 10.0 100.0% 0 4.17s 180 5,333
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 5.9 7.2 55.6% 1 495ms 12 0
Grok 4.20 5.3 10.0 33.3% 0 27.03s 375 49,339
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 5.0 10.0 0.0% 0 615ms 78 0
Grok 4.20 5.8 2.8 66.7% 1 7.09s 47 4,252
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 8.0 6.8 66.7% 1 672ms 70 0
Grok 4.20 7.3 5.9 83.3% 1 4.42s 40 5,474
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 5.7 10.0 33.3% 0 576ms 132 0
Grok 4.20 6.4 7.7 55.6% 1 3.89s 143 8,028
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 1.91s 234 0
Grok 4.20 3.0 10.0 0.0% 0 13.68s 197 6,620

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