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Gemini 3.5 Flash vs Grok 4.20 (medium)

Grok 4.20 (medium) leads on average score with 7.1 vs 7.0. Grok 4.20 (medium) has the lower benchmark cost at $0.777 vs $1.079. Gemini 3.5 Flash is faster at 9.93s vs 29.47s, with pass rates of 74.2% vs 63.6%.

Last updated at: 2026-08-11

Rank
#105
Total Output Tokens
117,518
Response Time (avg)
9.93s
Total Cost
$1.079
Rank
#101
Total Output Tokens
259,340
Response Time (avg)
29.47s
Total Cost
$0.777
Recommended model Gemini 3.5 Flash

Its score stays close to the best score here (7.0 vs 7.1), while responding about 3.0x faster than Grok 4.20 (medium).

Detailed comparison

Metric Gemini 3.5 Flash Gemini 3.5 Flash none Release: 2026-05-19 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 7.0 7.1
Rank #105 #101
Reliability 10.0 10.0
Consistency 8.9 8.5
Benchmark coverage 22/22 tests · 66/66 attempts 22/22 tests · 66/66 attempts
Tests Correct
Attempt pass rate 74.2% 63.6%
Flaky tests 3 4
Total Runs 66 66
Cost per result 7.190 9.709
Total Cost $1.079 $0.777
Input Price $1.500 / 1M $1.250 / 1M
Output Price $9.000 / 1M $2.500 / 1M
Total Input Tokens 13,843 102,791
Output Tokens 117,518 5,363
Reasoning Tokens 0 253,977
Response Time (avg) 9.93s 29.47s
Response Time (max) 64.36s 199.66s
Response Time (total) 178.68s 648.35s

Model generation showcase

Hamster playing table tennis

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

#105 Gemini 3.5 Flash

none
Cost
$0.225
Time
125.5s
Tokens
25,004 tok

#101 xAI: Grok 4.20

medium
Cost
$0.041
Time
110.3s
Tokens
16,336 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

Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 8.8 7.8 88.9% 1 34.69s 8,122 75,927 0
Grok 4.20 6.3 6.6 55.6% 1 109.93s 8,307 268 103,150

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