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OpenAI: GPT-5.5 vs xAI: Grok 4.1 Fast

Last updated at: 2026-04-24

Metric GPT-5.5 GPT-5.5 none Release: 2026-04-24 Grok 4.1 Fast Grok 4.1 Fast medium Release: 2025-11-19
Score 6.8 6.7
Rank #58 #62
Reliability N/A N/A
Consistency 8.3 7.2
Tests Correct
Attempt pass rate 61.1% 64.8%
Flaky tests 4 6
Total Runs 54 54
Cost per result 2.162 0.613
Total Cost $0.195 $0.056
Input Price $5.000 / 1M $0.200 / 1M
Output Price $30.000 / 1M $0.500 / 1M
Output Tokens 1,910 2,010
Reasoning Tokens 0 91,298
Response Time (avg) 1.83s 23.88s
Response Time (max) 5.56s 121.79s
Response Time (total) 32.86s 262.66s

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 4.1 Fast 8.7 7.9 91.7% 1 3.81s 108 4,741
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 4.1 Fast 2.3 1.1 33.3% 1 23.58s 821 6,703
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 4.1 Fast 10.0 10.0 100.0% 0 37.64s 261 12,272
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 4.1 Fast 10.0 10.0 100.0% 0 6.63s 180 5,409
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 4.1 Fast 5.8 4.4 66.7% 2 121.79s 11 37,657
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 4.1 Fast 4.2 9.9 0.0% 0 16.25s 127 3,456
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 4.1 Fast 6.6 10.0 50.0% 0 5.30s 55 3,489
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 4.1 Fast 5.3 7.2 44.4% 1 8.08s 187 6,086
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 4.1 Fast 2.8 1.6 33.3% 1 27.71s 260 11,485

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