Kimi K3 API — pricing & specs

Kimi K3, made by Moonshot AI, accepts text, image, and video input and returns text. Maker-documented 1,048,576-token context window. On KeepRouter, Kimi K3 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens, billed pay-as-you-go with no monthly fee. Call it through a compatible KeepRouter endpoint supported by its active route, with the model id kimi-k3.

How pricing works for Kimi K3

Kimi K3 is billed per token — $3.00 per 1M input tokens and $15.00 per 1M output tokens, with cached input at $0.3000 per 1M tokens. The published price is pay-as-you-go, with no monthly fee; actual request cost depends on measured token usage.

Calling Kimi K3 on KeepRouter

Point a compatible client at the supported KeepRouter endpoint and set the model to kimi-k3. KeepRouter preserves the client-facing request shape while handling upstream routing or translation. Use POST /v1/chat/completions or, on compatible chat routes, POST /v1/messages; streaming and tool support depend on the model's active route.

cURL

curl https://keeprouter.com/v1/chat/completions \
  -H "Authorization: Bearer $KEEPROUTER_KEY" -H "Content-Type: application/json" \
  -d '{"model":"kimi-k3","messages":[{"role":"user","content":"Hello"}]}'

Python

from openai import OpenAI
client = OpenAI(base_url="https://keeprouter.com/v1", api_key="$KEEPROUTER_KEY")
r = client.chat.completions.create(model="kimi-k3", messages=[{"role":"user","content":"Hello"}])

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://keeprouter.com/v1", apiKey: process.env.KEEPROUTER_KEY });
const r = await client.chat.completions.create({ model: "kimi-k3", messages: [{ role: "user", content: "Hello" }] });

Source and verification boundary

Official Kimi K3 documentation. KeepRouter's live catalog is authoritative for the customer price and enabled endpoint shown here; the maker remains authoritative for upstream model capabilities and limits.

Guides

• Call Kimi K3 with the OpenAI SDK
• Use Kimi K3 in Claude Code

Related models

• Kimi K2.5 by Moonshot AI — $0.6000 per 1M input tokens and $3.00 per 1M output tokens
• Kimi K2.7 Code (High-Speed) by Moonshot AI — $1.90 per 1M input tokens and $8.00 per 1M output tokens
• Kimi K2.6 by Moonshot AI — $0.6800 per 1M input tokens and $3.41 per 1M output tokens
• Magistral Medium by Mistral AI — $2.00 per 1M input tokens and $5.00 per 1M output tokens
• Magistral Small by Mistral AI — $0.5000 per 1M input tokens and $1.50 per 1M output tokens
• MiMo v2 Flash by Xiaomi — $0.1000 per 1M input tokens and $0.3000 per 1M output tokens

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Catalog facts and prices last changed 2026-08-26.