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Comparison

GPT 5 Codex vs Kimi K2

Side-by-side comparison of OpenAI GPT 5 Codex and Moonshot Kimi K2. Pricing, quality benchmarks, and context windows.

Quality Benchmarks

LiveBench / 0-100

Coding94 / 50Math94 / 81Reasoning94 / 60Language94 / 62

GPT 5 Codex

94.0Frontier

Kimi K2

63.4Strong

GPT 5 Codex
Kimi K2

Input Price (per 1M)

$1.25
$0.5700
54% less

Output Price (per 1M)

$10.00
$2.30
77% less

Context Window

400K
3.1x
131.1K

Max Output

128K
3.9x
32.8K

OpenAI

GPT 5 Codex

vs

Moonshot

Kimi K2

Pricing per 1M Tokens

$1.25

Input

Input

$0.5700

54% cheaper

Input

$10.00

Output

Output

$2.30

77% cheaper

Output

Token Limits

Context

400K

Context

Context

131.1K

Max Output

128K

Max Output

Max Output

32.8K

VisionTools
Tools

GPT 5 Codex Details

$1.25 in / $10.00 out

Kimi K2 Details

$0.5700 in / $2.30 out

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$1.25/M in · Score 94

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$0.6840/M in · Score 73.9

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