GPT-5.6 Luna vs Kimi K3

Price, context window & benchmark comparison

O

GPT-5.6 Luna

OpenAI
$0.20 / $1.20
Input / Output · per 1M tokens
VS
M

Kimi K3

Moonshot AI
$3.00 / $15.00
Input / Output · per 1M tokens
Compare different models
O
M
Verdict: GPT-5.6 Luna is 13.3× cheaper than Kimi K3 on a typical 3:1 input/output mix. Kimi K3 scores higher on the Artificial Analysis Intelligence Index (43.6 vs 37.3). GPT-5.6 Luna has the larger context window (1.1M vs 1M).
GPT-5.6 LunaKimi K3
Input price / 1M$0.20$3.00
Output price / 1M$1.20$15.00
Blended price (3:1)$0.45$6.00
Cached input / 1M$0.02$0.30
Context window1.1M1M
Max output128K944K
Intelligence index37.343.6
Coding index71.476.2
Providers720
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-07-092026-07-16
Retirement

Cost calculator

FAQ

Which is cheaper, GPT-5.6 Luna or Kimi K3?

GPT-5.6 Luna is 13.3× cheaper than Kimi K3 on a typical 3:1 input/output mix.

GPT-5.6 Luna vs Kimi K3: which has a bigger context window?

GPT-5.6 Luna: 1,050,000 tokens. Kimi K3: 1,048,576 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GPT-5.6 Luna ≈ $1,000, Kimi K3 ≈ $13,500.

More comparisons