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Kimi K2.5 (medium) vs Grok 4.20 (medium)

The average score is effectively tied at 7.0 vs 7.0. Kimi K2.5 (medium) has the lower benchmark cost at $0.607 vs $0.805. Grok 4.20 (medium) is faster at 32.56s vs 98.19s, with pass rates of 63.6% vs 60.6%.

Last updated at: 2026-08-15

Rank
#122
Total Output Tokens
220,942
Response Time (avg)
98.19s
Total Cost
$0.607
Rank
#120
Total Output Tokens
270,259
Response Time (avg)
32.56s
Total Cost
$0.805
Recommended model Grok 4.20 (medium)

It has the best score here (7.0), while responding about 3.0x faster than Kimi K2.5 (medium).

Detailed comparison

Metric Kimi K2.5 Kimi K2.5 medium Release: 2026-01-27 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 7.0 7.0
Rank #122 #120
Reliability 10.0 10.0
Consistency 7.0 8.2
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 63.6% 60.6%
Flaky tests 8 5
Total Runs 66 66
Cost per result 4.849 10.365
Total Cost $0.607 $0.805
Input Price $0.571 / 1M $1.250 / 1M
Output Price $2.850 / 1M $2.500 / 1M
Total Input Tokens 118,496 102,986
Output Tokens 53,522 5,860
Reasoning Tokens 167,420 264,399
Response Time (avg) 98.19s 32.56s
Response Time (max) 281.00s 199.66s
Response Time (total) 1571.05s 716.36s
Parameters 1T total (32B active) ~1T total (~100B active)
Availability Weights available Closed

Model generation showcase

Hamster playing table tennis

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

#122 MoonshotAI: Kimi K2.5

medium
Cost
$0.030
Time
58.6s
Tokens
8,683 tok

#120 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
Kimi K2.5 6.1 4.6 66.7% 2 217.49s 6,935 5,705 74,693
Grok 4.20 6.3 6.6 55.6% 1 109.93s 8,307 268 103,150

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