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MoonshotAI: Kimi K2.5 vs OpenAI: GPT-5.5

Summary

Kimi K2.5 vs GPT-5.5 benchmark comparison: Kimi K2.5 leads on average score with 6.8 vs 6.4. GPT-5.5 has the lower benchmark cost at $0.231 vs $0.328. GPT-5.5 is faster at 1.89s vs 98.43s, with pass rates of 68.3% vs 54.0%.

Recommended model: GPT-5.5 - Its score stays close to the best score here (6.4 vs 6.8), while responding about 52.1x faster than Kimi K2.5.

Last updated at: 2026-06-04

Metric Kimi K2.5 Kimi K2.5 medium Release: 2026-01-27 GPT-5.5 GPT-5.5 none Release: 2026-04-24
Score 6.8 6.4
Rank #76 #91
Reliability 10.0 10.0
Consistency 6.9 8.8
Tests Correct
Attempt pass rate 68.3% 54.0%
Flaky tests 8 3
Total Runs 63 63
Cost per result 3.704 2.302
Total Cost $0.328 $0.231
Input Price $0.400 / 1M $5.000 / 1M
Output Price $1.900 / 1M $30.000 / 1M
Total Input Tokens 34,312 34,212
Output Tokens 48,379 1,971
Reasoning Tokens 157,747 0
Response Time (avg) 98.43s 1.89s
Response Time (max) 281.00s 5.56s
Response Time (total) 1378.03s 39.64s

Generation showcase

Hamster playing table tennis

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

#76 MoonshotAI: Kimi K2.5

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

#91 GPT-5.5

none
Cost
$0.090
Time
54.3s
Tokens
3,063 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
Kimi K2.5 7.3 5.8 83.3% 2 51.38s 634 2,789 8,880
GPT-5.5 6.9 7.9 66.7% 1 1.31s 606 213 0
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
GPT-5.5 5.5 10.0 33.3% 0 1.35s 7,305 462 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Kimi K2.5 10.0 10.0 100.0% 0 71.37s 11,280 703 3,713
GPT-5.5 3.0 10.0 0.0% 0 5.56s 11,019 300 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Kimi K2.5 10.0 10.0 100.0% 0 49.78s 7,020 563 7,940
GPT-5.5 10.0 10.0 100.0% 0 1.18s 7,140 222 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Kimi K2.5 3.5 4.4 33.3% 2 137.29s 485 20,753 30,564
GPT-5.5 2.9 7.2 11.1% 1 1.31s 723 52 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Kimi K2.5 6.5 3.4 66.7% 1 69.73s 480 3,815 4,262
GPT-5.5 10.0 10.0 100.0% 0 3.41s 477 124 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Kimi K2.5 10.0 10.0 100.0% 0 92.47s 675 5,371 6,547
GPT-5.5 6.2 5.8 66.7% 1 1.15s 660 81 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Kimi K2.5 5.3 7.3 44.4% 1 43.23s 659 8,426 12,692
GPT-5.5 7.7 10.0 66.7% 0 1.29s 642 252 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Kimi K2.5 10.0 10.0 100.0% 0 31.74s 5,933 242 812
GPT-5.5 10.0 10.0 100.0% 0 3.90s 5,445 247 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Kimi K2.5 3.0 10.0 0.0% 0 83.95s 211 12 7,644
GPT-5.5 3.0 10.0 0.0% 0 5.01s 195 18 0

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