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OpenAI: GPT-5.5 vs xAI: Grok 4.3

Last updated at: 2026-05-01

Metric GPT-5.5 GPT-5.5 low Release: 2026-04-24 Grok 4.3 Grok 4.3 medium Release: 2026-05-01
Score 9.0 8.2
Rank #5 #20
Reliability 10.0 10.0
Consistency 9.6 8.6
Tests Correct
Attempt pass rate 87.0% 81.5%
Flaky tests 1 3
Total Runs 54 54
Cost per result 4.534 3.974
Total Cost $0.681 $0.517
Input Price $5.000 / 1M $1.250 / 1M
Output Price $30.000 / 1M $2.500 / 1M
Output Tokens 1,959 1,223
Reasoning Tokens 16,134 187,047
Response Time (avg) 8.39s 48.63s
Response Time (max) 56.19s 216.69s
Response Time (total) 151.01s 875.27s

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Score vs Response Time (avg)

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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 10.0 10.0 100.0% 0 4.15s 232 1,056
Grok 4.3 10.0 10.0 100.0% 0 8.83s 88 8,207
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 7.79s 369 936
Grok 4.3 10.0 10.0 100.0% 0 45.72s 284 9,659
Combined 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 9.56s 303 717
Grok 4.3 10.0 10.0 100.0% 0 63.99s 234 15,301
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 3.28s 228 157
Grok 4.3 10.0 10.0 100.0% 0 18.97s 180 9,546
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 5.3 10.0 33.3% 0 27.57s 69 11,731
Grok 4.3 5.3 7.2 44.4% 1 181.74s 14 111,300
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 3.45s 143 132
Grok 4.3 5.4 2.5 66.7% 1 24.70s 70 5,020
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 9.9 10.0 100.0% 0 2.98s 93 356
Grok 4.3 9.8 10.0 100.0% 0 18.58s 57 8,713
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 9.0 7.9 88.9% 1 4.48s 272 948
Grok 4.3 5.9 7.2 55.6% 1 22.53s 128 14,686
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 4.96s 250 101
Grok 4.3 10.0 10.0 100.0% 0 17.66s 168 4,615

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