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OpenAI: GPT-5 Nano vs xAI: Grok 4.1 Fast

Last updated at: 2026-04-29

Metric GPT-5 Nano GPT-5 Nano medium Release: 2025-08-07 Grok 4.1 Fast Grok 4.1 Fast medium Release: 2025-11-19
Score 6.3 6.7
Rank #74 #68
Reliability N/A N/A
Consistency 6.5 7.2
Tests Correct
Attempt pass rate 59.3% 64.8%
Flaky tests 8 6
Total Runs 54 54
Cost per result 0.942 0.613
Total Cost $0.066 $0.056
Input Price $0.050 / 1M $0.200 / 1M
Output Price $0.400 / 1M $0.500 / 1M
Output Tokens 4,980 2,010
Reasoning Tokens 156,288 91,298
Response Time (avg) 44.13s 23.88s
Response Time (max) 204.02s 121.79s
Response Time (total) 485.47s 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 Nano 6.5 7.9 58.3% 1 25.50s 1,221 21,184
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 Nano 6.7 3.5 66.7% 1 40.73s 480 12,992
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 Nano 10.0 10.0 100.0% 0 65.96s 578 17,984
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 Nano 3.7 1.7 50.0% 2 21.42s 453 10,560
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 Nano 5.2 4.4 55.6% 2 204.02s 237 64,448
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 Nano 4.1 10.0 0.0% 0 17.51s 202 4,608
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 Nano 8.5 6.8 83.3% 1 11.90s 382 4,096
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 Nano 5.3 7.2 44.4% 1 19.81s 869 13,440
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 Nano 10.0 10.0 100.0% 0 33.30s 558 6,976
Grok 4.1 Fast 2.8 1.6 33.3% 1 27.71s 260 11,485

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