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

Last updated at: 2026-04-11

Metric gpt-oss-120b gpt-oss-120b none Release: 2025-08-05 Free Available Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 5.2 7.0
Rank #79 #44
Consistency 7.9 7.8
Tests Correct
Attempt pass rate 38.9% 66.7%
Flaky tests 5 5
Total Runs 54 54
Cost per result 0.221 8.252
Total Cost $0.009 $0.743
Input Price $0.039 / 1M $2.000 / 1M
Output Price $0.190 / 1M $6.000 / 1M
Output Tokens 44,652 1,744
Reasoning Tokens 0 109,882
Response Time (avg) 11.96s 10.33s
Response Time (max) 68.97s 29.87s
Response Time (total) 179.34s 185.87s

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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 6.6 8.0 58.3% 1 6.03s 4,867 0
Grok 4.20 8.2 7.9 83.3% 1 3.36s 280 8,476
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
gpt-oss-120b 4.3 1.1 66.7% 1 9.57s 3,232 0
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
gpt-oss-120b 3.0 10.0 0.0% 0 0ms 0 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
gpt-oss-120b 6.5 10.0 50.0% 0 7.12s 598 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
gpt-oss-120b 3.0 10.0 0.0% 0 34.98s 29,483 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
gpt-oss-120b 4.6 10.0 0.0% 0 2.83s 586 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
gpt-oss-120b 8.4 6.9 83.3% 1 5.10s 1,982 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
gpt-oss-120b 4.5 4.8 44.5% 2 6.86s 3,904 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
gpt-oss-120b 3.0 10.0 0.0% 0 0ms 0 0
Grok 4.20 3.0 10.0 0.0% 0 13.68s 197 6,620

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