modelgrep

MoonshotAI: Kimi K2.6 vs OpenAI: GPT-5.3-Codex

moonshotai logoMoonshotAI: Kimi K2.6moonshotai/kimi-k2.6VSopenai logoOpenAI: GPT-5.3-Codexopenai/gpt-5.3-codex

MoonshotAI: Kimi K2.6 wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.

MetricMoonshotAI: Kimi K2.6OpenAI: GPT-5.3-Codex
Intelligence Index42.844.3✓
Coding Index56.0✓—
GPQA Diamond91%92%✓
Design Arena Elo1355✓1206
Speed (tokens/sec)158✓61
Latency277ms✓2.3s
Input price /M$0.660✓$1.75
Output price /M$3.41✓$14.00
Context window262K400K✓
CapabilitiesReasoningToolsJSONVisionReasoningToolsJSONVision
MoonshotAI: Kimi K2.6 details →OpenAI: GPT-5.3-Codex details →