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Gemini 3.5 Flash vs Grok 4.20 (medium)

The average score is effectively tied at 6.3 vs 6.3. Grok 4.20 (medium) has the lower benchmark cost at $1.582 vs $1.778. Gemini 3.5 Flash is faster at 14.35s vs 36.73s, with pass rates of 66.7% vs 58.0%.

Last updated at: 2026-10-01

Compared models

Rank
#225
Total Output Tokens
156,181
Response Time (avg)
14.35s
Total Cost
$1.778
Rank
#224
Total Output Tokens
302,087
Response Time (avg)
36.73s
Total Cost
$1.582
Recommended model Gemini 3.5 Flash

It has the best score here (6.3), while responding about 2.6x 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 6.3 6.3
Rank #225 #224
Reliability 10.0 10.0
Consistency 8.9 8.2
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 66.7% 58.0%
Flaky tests 3 5
Total Runs 69 69
Cost per result 12.695 14.374
Total Cost $1.778 $1.582
Input Price $1.500 / 1M $1.250 / 1M
Output Price $9.000 / 1M $2.500 / 1M
Total Input Tokens 247,729 392,127
Output Tokens 156,181 7,754
Reasoning Tokens 0 294,333
Response Time (avg) 14.35s 36.73s
Response Time (max) 89.30s 199.66s
Response Time (total) 272.60s 844.68s
Parameters ~500B total (~20B active) ~1T total (~100B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#225 Gemini 3.5 Flash

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

#224 SpaceXAI: 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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