Moonshot AIReasoning Model

Kimi K3.1 Pro

Moonshot AI's Kimi K3.1 Pro: the next release of the Kimi K3 open-weight reasoning family, with a 1M-token context window, native vision, tool calling, and a controllable reasoning-effort dial, served on an OpenAI-compatible API.

import OpenAI from "openai";

const openai = new OpenAI({
  baseURL: "https://api.inference.net/v1",
  apiKey: "<YOUR_API_KEY>",
});

const completion = await openai.chat.completions.create({
  model: "kimi-k3.1-pro",
  messages: [
    {
      role: "user",
      content: "What is the meaning of life?"
    }
  ],
  stream: true,
});

for await (const chunk of completion) {
  process.stdout.write(chunk.choices[0]?.delta.content as string);
}

import OpenAI from "openai";

const openai = new OpenAI({
  baseURL: "https://api.inference.net/v1",
  apiKey: "<YOUR_API_KEY>",
});

const completion = await openai.chat.completions.create({
  model: "kimi-k3.1-pro",
  messages: [
    {
      role: "user",
      content: "What is the meaning of life?"
    }
  ],
  stream: true,
});

for await (const chunk of completion) {
  process.stdout.write(chunk.choices[0]?.delta.content as string);
}

Prompt caching

No special request field is needed. Keep the prompt prefix stable and byte-identical across calls.
Check usage.prompt_tokens_details.cached_tokens in the response to confirm cache reads.

Related models

Model

InputCache readOutput

Kimi K3

1024K input contextVisionToolsReasoning$3.00 / $15.002 variants

977K input contextVisionToolsReasoning$0.10 / $0.50

256K input contextTools$0.102 / $0.48

125K input context$0.05 / $0.23

$0.05

$0.23

Schematron V2 Turbo

125K input context$0.03 / $0.15

$0.03

$0.15

Start building with Kimi K3.1 Pro today

Serverless, OpenAI-compatible, and billed per token. No commitments.