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OpenAI: GPT-5 Nano vs xAI: Grok 4.20 Beta

Last updated at: 2026-03-12

Metric GPT-5 Nano GPT-5 Nano medium Release: 2025-08-07 Grok 4.20 Beta Grok 4.20 Beta none Release: 2026-03-12
Rank #38 #52
Avg Score 5.5 4.4
Consistency 7.0 9.1
Cost per result 0.856 2.214
Total Cost $0.060 $0.089
Tests Correct
Attempt pass rate 60.4% 33.3%
Flaky tests 6 2
Total Runs 48 48
Output Tokens 4,386 1,511
Reasoning Tokens 142,080 0
Response Time (avg) 47.94s 1.22s
Response Time (max) 204.02s 6.48s
Response Time (total) 431.47s 19.53s

Top Models by Score

Score vs Total Cost

Response Time (avg)

Avg Score vs Response Time (avg)

Total Output Tokens

Avg 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 7.0 10.0 66.7% 0 37.73s 1,107 19,968
Grok 4.20 Beta 3.3 7.9 22.2% 1 562ms 245 0
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 Beta 10.0 10.0 0.0% 0 6.48s 282 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Nano 10.0 1.7 50.0% 2 21.42s 453 10,560
Grok 4.20 Beta 9.9 10.0 100.0% 0 601ms 197 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Nano 4.0 4.4 55.6% 2 204.02s 237 64,448
Grok 4.20 Beta 10.0 10.0 0.0% 0 611ms 160 0
General Intelligence 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 17.51s 202 4,608
Grok 4.20 Beta 5.0 10.0 0.0% 0 541ms 87 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Nano 9.0 6.8 83.3% 1 11.90s 382 4,096
Grok 4.20 Beta 4.5 10.0 0.0% 0 687ms 60 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Nano 4.0 7.2 44.4% 1 19.81s 869 13,440
Grok 4.20 Beta 4.0 7.2 55.6% 1 541ms 291 0
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 Beta 10.0 10.0 100.0% 0 4.79s 189 0

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