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xAI: Grok 4.1 Fast vs xAI: Grok 4.20

Last updated at: 2026-04-04

Metric Grok 4.1 Fast Grok 4.1 Fast medium Release: 2025-11-19 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 6.9 7.1
Rank #44 #41
Consistency 7.5 8.2
Tests Correct
Attempt pass rate 66.7% 66.7%
Flaky tests 5 4
Total Runs 51 51
Cost per result 0.568 7.358
Total Cost $0.052 $0.663
Input Price $0.200 / 1M $2.000 / 1M
Output Price $0.500 / 1M $6.000 / 1M
Output Tokens 1,189 1,494
Reasoning Tokens 84,595 97,078
Response Time (avg) 23.91s 9.50s
Response Time (max) 121.79s 29.87s
Response Time (total) 239.09s 161.54s

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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
Grok 4.1 Fast 8.7 7.9 91.7% 1 3.81s 108 4,741
Grok 4.20 8.2 7.9 83.3% 1 3.36s 280 8,476
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Grok 4.1 Fast 10.0 10.0 100.0% 0 37.64s 261 12,272
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
Grok 4.1 Fast 10.0 10.0 100.0% 0 6.63s 180 5,409
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
Grok 4.1 Fast 5.8 4.4 66.7% 2 121.79s 11 37,657
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
Grok 4.1 Fast 4.2 9.9 0.0% 0 16.25s 127 3,456
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
Grok 4.1 Fast 6.6 10.0 50.0% 0 5.30s 55 3,489
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
Grok 4.1 Fast 5.3 7.2 44.4% 1 8.08s 187 6,086
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
Grok 4.1 Fast 2.8 1.6 33.3% 1 27.71s 260 11,485
Grok 4.20 3.0 10.0 0.0% 0 13.68s 197 6,620

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