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OpenAI: GPT-5.5 vs xAI: Grok 4.20

Last updated at: 2026-04-24

Metric GPT-5.5 GPT-5.5 none Release: 2026-04-24 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 6.8 7.0
Rank #58 #55
Reliability N/A N/A
Consistency 8.3 7.8
Tests Correct
Attempt pass rate 61.1% 66.7%
Flaky tests 4 5
Total Runs 54 54
Cost per result 2.162 8.252
Total Cost $0.195 $0.743
Input Price $5.000 / 1M $2.000 / 1M
Output Price $30.000 / 1M $6.000 / 1M
Output Tokens 1,910 1,744
Reasoning Tokens 0 109,882
Response Time (avg) 1.83s 10.33s
Response Time (max) 5.56s 29.87s
Response Time (total) 32.86s 185.87s

Top Models by Score

Score vs Total Cost

Response Time (avg)

Score vs Response Time (avg)

Total Output Tokens

Score vs Total Output Tokens

Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 6.9 7.9 66.7% 1 1.31s 213 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-5.5 10.0 10.0 100.0% 0 2.05s 426 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-5.5 3.0 10.0 0.0% 0 5.56s 300 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-5.5 10.0 10.0 100.0% 0 1.18s 222 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-5.5 2.9 7.2 11.1% 1 1.31s 52 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-5.5 10.0 10.0 100.0% 0 3.41s 124 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-5.5 6.2 5.8 66.7% 1 1.15s 81 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-5.5 6.7 7.9 55.6% 1 1.36s 245 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-5.5 10.0 10.0 100.0% 0 3.90s 247 0
Grok 4.20 3.0 10.0 0.0% 0 13.68s 197 6,620

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