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Google: Gemini 3.1 Pro Preview vs xAI: Grok 4.20

Last updated at: 2026-04-02

Metric Gemini 3.1 Pro Preview Gemini 3.1 Pro Preview medium Release: 2026-02-19 Grok 4.20 Grok 4.20 none Release: 2026-03-31
Score 9.6 5.4
Rank #2 #69
Consistency 10.0 9.5
Tests Correct
Attempt pass rate 94.1% 31.4%
Flaky tests 0 1
Total Runs 51 51
Cost per result 3.257 1.809
Total Cost $0.522 $0.091
Input Price $2.000 / 1M $2.000 / 1M
Output Price $12.000 / 1M $6.000 / 1M
Output Tokens 1,527 1,655
Reasoning Tokens 36,341 0
Response Time (avg) 15.56s 1.11s
Response Time (max) 40.61s 6.04s
Response Time (total) 155.64s 18.80s

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Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 7.90s 112 3,218
Grok 4.20 4.8 10.0 25.0% 0 501ms 267 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 9.5 10.0 100.0% 0 40.61s 432 9,281
Grok 4.20 3.0 10.0 0.0% 0 6.04s 282 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 7.72s 279 3,904
Grok 4.20 10.0 10.0 100.0% 0 522ms 207 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 7.7 10.0 66.7% 0 32.73s 18 12,424
Grok 4.20 3.0 10.0 0.0% 0 687ms 325 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 11.77s 108 1,179
Grok 4.20 4.8 10.0 0.0% 0 659ms 83 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 9.56s 72 2,236
Grok 4.20 4.8 10.0 0.0% 0 455ms 60 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 7.15s 232 3,117
Grok 4.20 5.3 7.4 44.4% 1 487ms 242 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 23.15s 274 982
Grok 4.20 10.0 10.0 100.0% 0 4.63s 189 0

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