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Google: Gemini 3.1 Pro Preview vs xAI: Grok 4.20

Last updated at: 2026-05-10

Metric Gemini 3.1 Pro Preview Gemini 3.1 Pro Preview medium Release: 2026-02-19 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 9.6 6.9
Rank #2 #68
Reliability 10.0 10.0
Consistency 10.0 8.3
Tests Correct
Attempt pass rate 94.7% 63.2%
Flaky tests 0 4
Total Runs 57 57
Cost per result 3.300 7.559
Total Cost $0.594 $0.756
Input Price $2.000 / 1M $1.250 / 1M
Output Price $12.000 / 1M $2.500 / 1M
Output Tokens 1,944 1,784
Reasoning Tokens 41,839 128,233
Response Time (avg) 15.15s 14.53s
Response Time (max) 40.61s 63.48s
Response Time (total) 181.78s 276.06s

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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
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 7.90s 112 3,218
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
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 19.88s 405 4,201
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
Gemini 3.1 Pro Preview 9.5 10.0 100.0% 0 40.61s 432 9,281
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
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 4.17s 180 5,333
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 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
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 11.77s 108 1,179
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
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 9.56s 72 2,236
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
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 7.15s 232 3,117
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
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 23.15s 274 982
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
Gemini 3.1 Pro Preview 10.0 10.0 100.0% 0 6.27s 12 1,297
Grok 4.20 3.0 10.0 0.0% 0 63.48s 9 16,442

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