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Qwen: Qwen3.5-Flash vs xAI: Grok 4.20

Last updated at: 2026-04-02

Metric Qwen3.5-Flash Qwen3.5-Flash none Release: 2026-02-24 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 6.0 7.1
Rank #54 #40
Consistency 9.6 8.2
Tests Correct
Attempt pass rate 43.1% 66.7%
Flaky tests 1 4
Total Runs 51 51
Cost per result 0.077 7.358
Total Cost $0.006 $0.663
Input Price $0.065 / 1M $2.000 / 1M
Output Price $0.260 / 1M $6.000 / 1M
Output Tokens 3,777 1,494
Reasoning Tokens 0 97,078
Response Time (avg) 3.36s 9.50s
Response Time (max) 13.73s 29.87s
Response Time (total) 57.15s 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
Qwen3.5-Flash 3.5 8.3 8.3% 1 1.32s 690 0
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
Qwen3.5-Flash 3.0 10.0 0.0% 0 6.22s 1,794 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
Qwen3.5-Flash 10.0 10.0 100.0% 0 1.57s 243 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
Qwen3.5-Flash 7.7 10.0 66.7% 0 905ms 15 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
Qwen3.5-Flash 10.0 10.0 100.0% 0 803ms 100 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
Qwen3.5-Flash 6.3 10.0 50.0% 0 8.81s 63 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
Qwen3.5-Flash 3.3 10.0 0.0% 0 5.90s 608 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
Qwen3.5-Flash 10.0 10.0 100.0% 0 3.67s 264 0
Grok 4.20 3.0 10.0 0.0% 0 13.68s 197 6,620

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