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Google: Gemini 2.5 Flash vs xAI: Grok 4.5

Summary

Gemini 2.5 Flash (medium) vs Grok 4.5 (medium) benchmark comparison: Grok 4.5 (medium) leads on average score with 8.3 vs 8.2. Gemini 2.5 Flash (medium) has the lower benchmark cost at $0.379 vs $1.696. Gemini 2.5 Flash (medium) is faster at 15.49s vs 62.63s, with pass rates of 69.8% vs 77.8%.

Recommended model: Gemini 2.5 Flash (medium) - Its score stays close to the best score here (8.2 vs 8.3), while costing about 4.5x less than Grok 4.5 (medium).

Last updated at: 2026-07-08

Metric Gemini 2.5 Flash Gemini 2.5 Flash medium Release: 2025-06-17 Grok 4.5 Grok 4.5 medium Release: 2026-07-08
Score 8.2 8.3
Rank #25 #23
Reliability 10.0 9.9
Consistency 9.6 8.9
Tests Correct
Attempt pass rate 69.8% 77.8%
Flaky tests 1 3
Total Runs 63 63
Cost per result 2.701 11.304
Total Cost $0.379 $1.696
Input Price $0.300 / 1M $2.000 / 1M
Output Price $2.500 / 1M $6.000 / 1M
Total Input Tokens 34,476 53,500
Output Tokens 1,930 1,621
Reasoning Tokens 145,145 263,127
Response Time (avg) 15.49s 62.63s
Response Time (max) 95.48s 436.38s
Response Time (total) 325.39s 1315.20s

Generation showcase

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#25 Gemini 2.5 Flash

medium
Invalid SVG
Cost
$0.000
Time
274.0s
Tokens
0 tok

#23 xAI: Grok 4.5

medium
Cost
$0.044
Time
59.4s
Tokens
7,512 tok

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) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 8.4 10.0 75.0% 0 6.30s 492 255 10,233
Grok 4.5 10.0 10.0 100.0% 0 23.50s 2,991 147 4,018
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 7.8 10.0 66.7% 0 41.01s 6,669 543 32,303
Grok 4.5 7.6 7.2 77.8% 1 155.69s 9,579 390 104,634
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 28.44s 12,522 303 11,922
Grok 4.5 10.0 10.0 100.0% 0 15.65s 15,084 261 4,254
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 4.06s 7,257 279 2,325
Grok 4.5 10.0 10.0 100.0% 0 6.29s 8,937 225 3,657
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 5.9 7.2 55.6% 1 37.34s 633 18 80,702
Grok 4.5 2.9 7.2 11.1% 1 198.89s 2,212 11 121,922
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 4.8 10.0 0.0% 0 4.86s 486 92 1,899
Grok 4.5 6.5 3.4 66.7% 1 12.84s 1,077 71 2,384
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 9.8 10.0 100.0% 0 2.62s 615 69 1,203
Grok 4.5 9.8 10.0 100.0% 0 6.06s 1,857 57 2,728
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 7.7 10.0 66.7% 0 3.18s 558 126 2,499
Grok 4.5 10.0 10.0 100.0% 0 7.75s 2,430 254 3,641
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 10.0 10.0 100.0% 0 6.20s 5,088 234 1,140
Grok 4.5 10.0 10.0 100.0% 0 6.57s 8,544 192 968
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 3.0 10.0 0.0% 0 2.76s 156 11 919
Grok 4.5 3.0 10.0 0.0% 0 74.44s 789 13 14,921

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