Kimi K3 APIの使い方｜APIキー・料金・Python・Node.jsを実践解説【2026年7月】

export MOONSHOT_API_KEY="取得したAPIキー"

$env:MOONSHOT_API_KEY="取得したAPIキー"

curl https://api.moonshot.ai/v1/chat/completions \
  -H "Authorization: Bearer $MOONSHOT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kimi-k3",
    "messages": [
      {"role": "user", "content": "Kimi K3を日本語で一文で紹介してください。"}
    ],
    "reasoning_effort": "low"
  }'

python3 -m pip install --upgrade "openai>=1.0"

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["MOONSHOT_API_KEY"],
    base_url="https://api.moonshot.ai/v1",
)

response = client.chat.completions.create(
    model="kimi-k3",
    reasoning_effort="low",
    messages=[
        {"role": "system", "content": "あなたは簡潔に回答する日本語アシスタントです。"},
        {"role": "user", "content": "Kimi K3 APIの活用例を3つ挙げてください。"},
    ],
)

print(response.choices[0].message.content)

npm install openai

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.MOONSHOT_API_KEY,
  baseURL: "https://api.moonshot.ai/v1",
});

const response = await client.chat.completions.create({
  model: "kimi-k3",
  reasoning_effort: "low",
  messages: [
    { role: "system", content: "あなたは簡潔に回答する日本語アシスタントです。" },
    { role: "user", content: "Kimi K3 APIの活用例を3つ挙げてください。" },
  ],
});

console.log(response.choices[0].message.content);

stream = client.chat.completions.create(
    model="kimi-k3",
    reasoning_effort="high",
    messages=[{"role": "user", "content": "Pythonのコードを安全にレビューする観点を説明してください。"}],
    stream=True,
)

for chunk in stream:
    delta = chunk.choices[0].delta
    if delta.content:
        print(delta.content, end="", flush=True)

import json

response = client.chat.completions.create(
    model="kimi-k3",
    messages=[{"role": "user", "content": "この問い合わせを分類：ログインできず、401と表示されます。"}],
    response_format={
        "type": "json_schema",
        "json_schema": {
            "name": "support_ticket",
            "strict": True,
            "schema": {
                "type": "object",
                "properties": {
                    "category": {"type": "string"},
                    "priority": {"type": "string"},
                    "summary": {"type": "string"}
                },
                "required": ["category", "priority", "summary"],
                "additionalProperties": False
            }
        }
    }
)

ticket = json.loads(response.choices[0].message.content)
print(ticket)