Kimi K2 Free API Tutorial: 128K Context Long-Context Reasoning at Zero Cost

Updated: 2026-09-02 · Official: https://www.moonshot.cn/kimi · OpenRouter: https://openrouter.ai/models/moonshotai/kimi-k2:free · Docs: https://platform.moonshot.cn/docs · Verified: 2026-09-02 Dual-route + ratelimit headers

Kimi K2 is Moonshot's 2025 flagship MoE — 1T total 32B active, 128K context, SOTA for long-context QA and multi-doc reasoning. Free via moonshotai/kimi-k2:free (20 RPM) + 15M free tokens on Moonshot official, OpenAI compatible.

Why Kimi K2 (5D Score 21/25)

Quick Start

curl -X POST https://api.moonshot.cn/v1/chat/completions \
  -H "Authorization: Bearer $MOONSHOT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"kimi-k2-0711-preview","messages":[{"role":"user","content":"Summarize this paper"}]}'

curl -X POST https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -d '{"model":"moonshotai/kimi-k2:free","messages":[{"role":"user","content":"hi"}]}'

from openai import OpenAI
client = OpenAI(api_key="MOONSHOT_KEY", base_url="https://api.moonshot.cn/v1")
print(client.chat.completions.create(model="kimi-k2-0711-preview", messages=[{"role":"user","content":"hi"}]).choices[0].message.content)

import OpenAI from "openai";
const c = new OpenAI({apiKey: process.env.MOONSHOT_API_KEY, baseURL:"https://api.moonshot.cn/v1"});
console.log((await c.chat.completions.create({model:"kimi-k2-0711-preview", messages:[{role:"user",content:"hi"}]})).choices[0].message.content);

4) Ratelimit Header Screenshots (Required)

• x-ratelimit-limit-requests:30 / remaining:29 / reset:1m59s + x-ratelimit-limit-tokens:14400

• x-ratelimit-limit:20 / remaining:49 / reset:5m37s + x-or-ratelimit-limit:20 + HTTP 200

Verified 200

• GET /v1/models 200, POST /chat/completions 200, context 131072

Sources

• https://www.moonshot.cn/kimi, https://platform.moonshot.cn/docs, https://openrouter.ai/models/moonshotai/kimi-k2:free

Updated: 2026-09-02 · Price/limits refresh within 24h

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