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OpenAI: GPT-5 Mini vs xAI: Grok 4.20

Last updated at: 2026-04-02

Metric GPT-5 Mini GPT-5 Mini medium Release: 2025-08-07 Grok 4.20 Grok 4.20 none Release: 2026-03-31
Score 6.8 5.4
Rank #45 #69
Consistency 8.5 9.5
Tests Correct
Attempt pass rate 58.8% 31.4%
Flaky tests 3 1
Total Runs 51 51
Cost per result 1.473 1.809
Total Cost $0.118 $0.091
Input Price $0.250 / 1M $2.000 / 1M
Output Price $2.000 / 1M $6.000 / 1M
Output Tokens 5,896 1,655
Reasoning Tokens 49,322 0
Response Time (avg) 24.02s 1.11s
Response Time (max) 88.15s 6.04s
Response Time (total) 408.39s 18.80s

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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
GPT-5 Mini 7.1 7.6 66.7% 1 13.86s 1,715 6,378
Grok 4.20 4.8 10.0 25.0% 0 501ms 267 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Mini 10.0 10.0 100.0% 0 88.15s 754 11,520
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
GPT-5 Mini 10.0 10.0 100.0% 0 12.58s 453 3,200
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
GPT-5 Mini 3.6 7.2 22.2% 1 44.63s 293 14,016
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
GPT-5 Mini 4.5 10.0 0.0% 0 13.50s 349 1,856
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
GPT-5 Mini 8.0 6.6 83.3% 1 15.66s 318 4,992
Grok 4.20 4.8 10.0 0.0% 0 455ms 60 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Mini 5.6 9.8 33.3% 0 14.09s 1,527 5,760
Grok 4.20 5.3 7.4 44.4% 1 487ms 242 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Mini 10.0 10.0 100.0% 0 18.64s 487 1,600
Grok 4.20 10.0 10.0 100.0% 0 4.63s 189 0

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