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OpenAI: GPT-5 Nano vs xAI: Grok 4.20

Last updated at: 2026-05-21

Metric GPT-5 Nano GPT-5 Nano medium Release: 2025-08-07 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 6.2 6.9
Rank #92 #74
Reliability 10.0 10.0
Consistency 7.0 8.3
Tests Correct
Attempt pass rate 57.9% 63.2%
Flaky tests 7 4
Total Runs 57 57
Cost per result 0.856 7.559
Total Cost $0.069 $0.756
Input Price $0.050 / 1M $1.250 / 1M
Output Price $0.400 / 1M $2.500 / 1M
Output Tokens 5,214 1,784
Reasoning Tokens 162,432 128,233
Response Time (avg) 42.13s 14.53s
Response Time (max) 204.02s 63.48s
Response Time (total) 505.59s 276.06s

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 4.20 8.2 7.9 83.3% 1 3.95s 287 8,312
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 4.20 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 Nano 10.0 10.0 100.0% 0 65.96s 578 17,984
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 Nano 3.7 1.7 50.0% 2 21.42s 453 10,560
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 Nano 5.2 4.4 55.6% 2 204.02s 237 64,448
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 Nano 4.1 10.0 0.0% 0 17.51s 202 4,608
Grok 4.20 3.9 2.6 33.3% 1 24.48s 65 6,440
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Nano 9.8 10.0 100.0% 0 11.90s 382 4,096
Grok 4.20 7.3 6.0 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 Nano 5.3 7.2 44.4% 1 19.81s 869 13,440
Grok 4.20 7.7 10.0 66.7% 0 6.20s 149 7,913
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 4.20 3.0 10.0 0.0% 0 13.68s 197 6,620
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Nano 3.0 10.0 0.0% 0 20.13s 234 6,144
Grok 4.20 3.0 10.0 0.0% 0 63.48s 9 16,442

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