Kimi K3 API, pricing, playground & code

Name: Kimi K3 API
Brand: Moonshot AI

Overview

About Kimi K3

Kimi K3 is Moonshot's open-weights agentic flagship, tool-calling tuned specifically for agent harnesses, 256k context, at a fraction of frontier pricing. It has become the default open-model brain for Claude Code, Cline, and OpenClaw setups; K2.6 sits below it as the value tier. Every model on CompanyFabric shares the same API key, billing balance, and rate-limit envelope, one integration covers the entire library.

Facts

At a glance

Availability

Live

Pricing

$3/Mtok in

Metered exactly per call

Context window

256k tokens

Commercial use

See license

Commercial output use permitted per Moonshot terms.

Variants

All endpoints

Kimi K3

$3/Mtok in

Agentic coding model with strong multi-step tool use.

Chat Completions

Kimi K2.6

$0.95/Mtok in

Moonshot's value tier, K3-style agentic tool-calling at half the price, a favorite for high-volume agent loops.

Chat Completions

Prompt library

Example runs

Refactor this 300-line route handler into service + validation layers.

// services/orders.ts…

This exact run cost $0.011

Quickstart

How to use the Kimi K3 API

1
Create a free CompanyFabric account, starter credits are included, no card required.
2
Copy your API key from the dashboard. One key covers every model in the library.
3
Point any OpenAI SDK at api.companyfabric.com/v1 and set model to "moonshotai/kimi-k3".
4
Read the exact metered cost of the call from the response, the same number shown in the playground.

Use cases

What teams build with it

Coding agents

Agentic edit loops, repo comprehension, and tool-driven refactors.

coding agenttool use

Autocomplete & FIM

Editor completions and fill-in-the-middle at latency and prices built for every keystroke.

autocompletefim

Bulk code generation

Test scaffolding, migrations, and boilerplate at commodity cost, reviewed by a frontier model.

codegentests

Get better output

Prompting tips

Give the failing test or error output verbatim, it beats describing the bug.
Constrain the diff: name the files in scope and forbid drive-by refactors.
Ask for the plan before the patch on multi-file changes.

Exact, metered, prepaid

Kimi K3 pricing

Kimi K3 pricing is per token: $3 / M input · $15 / M output. Output tokens cost 5× input tokens, so long generations, not long prompts, are what actually drive most bills. A typical call with a 2k-token prompt and a 1k-token answer costs about $0.0210.

Every call is metered exactly and attributed to your key, the dashboard, the API usage response, and your invoice all read from the same ledger row. Cap any key's monthly spend with a budget cap, and bring your own provider key (BYOK) at 0% platform fee if you already have a direct contract.

Endpoint	Type	Price
Kimi K3	Chat	$3 / M input · $15 / M output
Kimi K2.6	Chat	$0.95 / M input · $4 / M output

Starter credits

Use Kimi K3 free

Your CompanyFabric starter credits cover your first Kimi K3 calls at no cost, create a free account, no card required, and the credits apply to Kimi K3 and every other model on the key. When they run out, prepaid credits or BYOK (0% fee) take over with no plan to pick.

All ways to use AI models free →Run Kimi K3 locally (open weights) →

Production-grade

Code samples

import OpenAI from "openai"

const client = new OpenAI({
  baseURL: "https://api.companyfabric.com/v1",
  apiKey: process.env.COMPANYFABRIC_API_KEY,
})

const res = await client.chat.completions.create({
  model: "moonshotai/kimi-k3",
  max_tokens: 1024,
  temperature: 0.7,
  messages: [{ role: "user", content: "Say hello from the fabric." }],
})

console.log(res.choices[0].message.content)

Playground

Try it in the browser

Playground$3 in / $15 out per 1M tokens

Model

Max output

Prompt

Comparisons

Kimi K3 vs the alternatives

Kimi K3 vs Claude Sonnet 4.5

Sonnet 4.5 is the reliability ceiling for agent loops; K3 delivers a surprising share of that at roughly a third of the price. The pattern that wins: K3 as the volume lane, Sonnet on escalation.

FAQ

Frequently asked questions

How much does the Kimi K3 API cost?

$3 / M input · $15 / M output. Every call is metered exactly and shown before you run it.

How do I get a Kimi K3 API key?

Create a CompanyFabric account, and one key unlocks Kimi K3 and every other model in the library. Free starter credits are included, no subscription, no card required to try it.

Why use Kimi K3 on CompanyFabric instead of going direct?

One key, one prepaid balance, and one rate-limit envelope across the whole library, at pricing at parity with or below the direct API. Model switching is a one-line change, and BYOK routing is 0% fee.

Is the API OpenAI-compatible?

Yes, point any OpenAI SDK at api.companyfabric.com/v1 and set model to "moonshotai/kimi-k3".

Can I use the output commercially?

Commercial output use permitted per Moonshot terms.

How does billing work?

Prepaid credits via card, or BYOK with your own provider keys at 0% platform fee. No subscription required; balances never expire.

Provider

About Moonshot AI

Moonshot AI publishes the kimi family. Also in this family: Kimi K2.6. License: Commercial output use permitted per Moonshot terms.

One key. Every model. Exact prices.

Run Kimi K3 with free starter credits. Free starter credits included, no subscription required.

Get your API key Browse all models