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MoonshotAI: Kimi K3 vs OpenAI: GPT-5.3-Codex

Summary

GPT-5.3-Codex (medium) leads on average score with 8.9 vs 8.5. GPT-5.3-Codex (medium) has the lower benchmark cost at $0.740 vs $3.112. GPT-5.3-Codex (medium) is faster at 16.22s vs 122.48s, with pass rates of 82.5% vs 82.5%.

Recommended modelGPT-5.3-Codex (medium)It has the best score here (8.9), while costing about 4.2x less than Kimi K3 (max).

Last updated at: 2026-07-16

Metric Kimi K3 Kimi K3 max Release: 2026-07-16 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 8.5 8.9
Rank #21 #13
Reliability 9.4 10.0
Consistency 9.2 8.5
Tests Correct
Attempt pass rate 82.5% 82.5%
Flaky tests 2 4
Total Runs 63 63
Cost per result 19.446 4.932
Total Cost $3.112 $0.740
Input Price $3.000 / 1M $1.750 / 1M
Output Price $15.000 / 1M $14.000 / 1M
Total Input Tokens 34,916 34,299
Output Tokens 2,910 2,357
Reasoning Tokens 197,529 46,189
Response Time (avg) 122.48s 16.22s
Response Time (max) 766.58s 100.93s
Response Time (total) 2327.06s 340.67s

Generation showcase

Hamster playing table tennis

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

#21 MoonshotAI: Kimi K3

max
Cost
$0.281
Time
506.9s
Tokens
18,863 tok

#13 GPT-5.3-Codex

medium
Cost
$0.049
Time
54.9s
Tokens
3,580 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 K3 10.0 10.0 100.0% 0 325.79s 8,061 460 84,012
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.50s 7,302 535 10,890

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