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OpenAI: gpt-oss-120b vs xAI: Grok 4.20

Last updated at: 2026-04-02

Metric gpt-oss-120b gpt-oss-120b medium Release: 2025-08-05 Free Available Grok 4.20 Grok 4.20 none Release: 2026-03-31
Score 6.0 5.4
Rank #56 #69
Consistency 7.6 9.5
Tests Correct
Attempt pass rate 51.0% 31.4%
Flaky tests 5 1
Total Runs 51 51
Cost per result 0.136 1.809
Total Cost $0.010 $0.091
Input Price $0.039 / 1M $2.000 / 1M
Output Price $0.190 / 1M $6.000 / 1M
Output Tokens 13,265 1,655
Reasoning Tokens 34,330 0
Response Time (avg) 15.05s 1.11s
Response Time (max) 50.92s 6.04s
Response Time (total) 150.55s 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-oss-120b 6.7 9.9 50.0% 0 10.21s 3,518 2,177
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-oss-120b 10.0 10.0 100.0% 0 31.18s 694 5,072
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-oss-120b 6.4 5.9 66.7% 1 1.98s 241 1,114
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-oss-120b 2.9 4.4 22.2% 2 50.92s 6,784 20,606
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-oss-120b 4.3 10.0 0.0% 0 7.90s 107 387
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-oss-120b 9.9 10.0 100.0% 0 7.63s 126 1,799
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-oss-120b 3.2 4.7 22.2% 2 11.80s 1,508 2,092
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-oss-120b 9.8 10.0 100.0% 0 6.91s 287 1,083
Grok 4.20 10.0 10.0 100.0% 0 4.63s 189 0

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