Kimi K3 Fast

Reviewed by Proof · Updated

Definition

Kimi K3 Fast is a model id luv13 lists as luv13/kimi-k3-fast, named after Moonshot AI's Kimi K3.

Key facts

Model id

luv13/kimi-k3-fast
luv13 price
$0.33 per 1M tokens, input and output
Availability
Available

Key takeaways

  • The luv13 model id is luv13/kimi-k3-fast.
  • Moonshot AI's official model list doesn't include a model named Kimi K3 Fast (checked 2026-10-01), so this page gives no maker specs.
  • There is no separate maker product page for a "Fast" SKU; do not invent context, modalities, or architecture for this id.
  • luv13 hasn't published how it differs from luv13/kimi-k3.
  • For the maker's facts about Kimi K3 itself, see Kimi K3.

Overview

luv13 lists this model as "Kimi K3 Fast". The name points to Kimi K3 from Moonshot AI, but Moonshot's official model list on its API platform shows kimi-k3 and no separate "fast" model, and there's no maker model card for it. So this page doesn't state a maker, context window, modalities or release date for it.

Gaps (as of 2026-10-01): no Moonshot Fast model card, no published maker modalities or context window for this id, and no luv13 note on how routing or latency differs from luv13/kimi-k3. Price is still the flat luv13 rate; see Pricing.

If you're choosing between the two, send the same prompts to both ids and compare.

Examples

Set your key first: export LUV13_API_KEY=sk-luv13-... (see Keys and Accounts).

curl:

curl https://api.luv13.ai/v1/chat/completions \
  -H "Authorization: Bearer $LUV13_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "luv13/kimi-k3-fast", "messages": [{"role": "user", "content": "Hello"}]}'

Python (pip install openai):

import os
from openai import OpenAI

client = OpenAI(base_url="https://api.luv13.ai/v1", api_key=os.environ["LUV13_API_KEY"])
reply = client.chat.completions.create(
    model="luv13/kimi-k3-fast",
    messages=[{"role": "user", "content": "Hello"}],
)
print(reply.choices[0].message.content)

JavaScript (npm install openai, Node.js):

import OpenAI from "openai";

const client = new OpenAI({ baseURL: "https://api.luv13.ai/v1", apiKey: process.env.LUV13_API_KEY });
const reply = await client.chat.completions.create({
  model: "luv13/kimi-k3-fast",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(reply.choices[0].message.content);

Without a valid key, all three return HTTP 401 with "type": "invalid_auth" (checked on 2026-09-30). See Errors and Status Codes.

FAQ

What model id do I use on luv13? luv13/kimi-k3-fast, exactly as GET /v1/models lists it. See Model IDs.

How is it different from Kimi K3? luv13 hasn't published that yet, and Moonshot AI's official model list has no model by this name.

How much does it cost on luv13? See Pricing.

Sources