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Grok 4.1 Fast vs xAI: Grok 4.20

Last updated at: 2026-05-19

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 6.5 6.9
Rank #84 #73
Reliability 10.0 10.0
Consistency 7.3 8.3
Tests Correct
Attempt pass rate 61.4% 63.2%
Flaky tests 6 4
Total Runs 57 57
Cost per result 0.644 7.559
Total Cost $0.058 $0.756
Input Price $0.000 / 1M $1.250 / 1M
Output Price $0.000 / 1M $2.500 / 1M
Output Tokens 2,025 1,784
Reasoning Tokens 96,679 128,233
Response Time (avg) 24.01s 14.53s
Response Time (max) 121.79s 63.48s
Response Time (total) 288.18s 276.06s

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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 3.95s 287 8,312
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Grok 4.1 Fast 2.3 1.1 33.3% 1 23.58s 821 6,703
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
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 3.9 2.6 33.3% 1 24.48s 65 6,440
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Grok 4.1 Fast 6.5 10.0 50.0% 0 5.30s 55 3,489
Grok 4.20 7.3 6.0 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 7.7 10.0 66.7% 0 6.20s 149 7,913
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
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Grok 4.1 Fast 3.0 10.0 0.0% 0 25.52s 15 5,381
Grok 4.20 3.0 10.0 0.0% 0 63.48s 9 16,442

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