A NEW PERSPECTIVE ON EVERY INPUT

Kimi K31 ProThink beyond text.

Meet Kimi K31 Pro, your workspace for clear thinking across words, images and spoken ideas. Explore the Moonshot AI model in a focused playground, then bring it into your product through one API.

Try Kimi K31 Pro Read the API guide

10 welcome credits · Google sign-in · Pay as you go

K31 / PLAYGROUND

ONE CONVERSATION. MORE CONTEXT.

Look at this product sketch and turn my voice notes into a launch plan.

Bring the visual details and the spoken brief together. Find the key decisions, then turn them into a practical next step.

TextImagesAudio

Illustrative workflow · Text responses

Kimi K31 Pro context window

3 ways in

Text, images & transcribed audio

One API

Kimi K31 Pro in your application

SEE THE WHOLE PICTURE

Kimi K31 Pro, with room for the full idea.

Use Kimi K31 Pro to move between a question, a visual reference and a recorded thought without losing the thread.

Kimi K31 Pro for text

Give Kimi K31 Pro a brief, a difficult question or a draft. Ask for an explanation, a rewrite or a structured plan.

Kimi K31 Pro for images

Show Kimi K31 Pro screenshots, diagrams and photographs. Ask it to describe details, compare evidence or explain what it sees.

Kimi K31 Pro for audio notes

Upload a recording to Kimi K31 Pro. The service transcribes speech first, then Kimi reasons over the transcript alongside your prompt.

Kimi K31 Pro for coding

Bring code and interface references to Kimi K31 Pro. Explore implementation options, debug a problem and review an approach.

Kimi K31 Pro for long context

Keep relevant background together with Kimi K31 Pro. The upstream model offers a 1,048,576-token context window; service request limits also apply.

Kimi K31 Pro for your product

Move from the Kimi K31 Pro playground to an OpenAI-compatible API, using the same account, API keys and credit balance.

FROM INPUT TO INSIGHT

What will you make with Kimi K31 Pro?

Research with Kimi K31 Pro

Ask Kimi K31 Pro to compare supplied sources, surface disagreements and identify the questions that need more evidence.

Design with Kimi K31 Pro

Use Kimi K31 Pro to discuss a screenshot or wireframe and translate visual observations into an actionable product brief.

Write with Kimi K31 Pro

Turn rough notes into a first draft with Kimi K31 Pro, then refine the tone and structure through conversation.

Study with Kimi K31 Pro

Work through an explanation with Kimi K31 Pro. Add a diagram, ask follow-up questions and test your understanding.

Start a Kimi K31 Pro conversation in minutes.

Sign in to Kimi K31 Pro

Continue with Google and receive 10 Kimi K31 Pro welcome credits when your account is created.

Give Kimi K31 Pro context

Write your prompt and attach an image or audio recording. Kimi K31 Pro also supports video input.

Build with Kimi K31 Pro

Review the response and actual credits used. Connect Kimi K31 Pro to your application when you are ready.

BUILT FOR BUILDERS

Kimi K31 Pro, one request away.

Use Kimi K31 Pro through /v1/chat/completions. Send text or multipart messages, keep your key on the server and inspect usage after every response.

Build with the Kimi K31 Pro API

POST https://k31.pro/v1/chat/completions

{
  "model": "moonshotai/kimi-k3.1-pro",
  "messages": [{
    "role": "user",
    "content": "Give this idea a new perspective."
  }],
  "max_completion_tokens": 64,
  "stream": false
}

Choose your Kimi K31 Pro plan

Start with 10 welcome credits. Choose an existing credit pack or subscription when you need more.

1 USD = 10,000 credits. Existing credit packs and subscription plans keep their prices and allocations. Kimi usage is billed by actual input, cache and output usage, including audio transcription when used. Credits are reserved before a request and settled afterward, with a one-credit minimum per successful request.

Starter

$10

For your first workflows and integration.

100,000 credits, no expiry
Text, image and audio workflows
Usage-based credit billing
Online playground
API key management
Request usage & credit history

Recommended

Pro

$100

For regular use and repeated evaluations.

1,000,000 credits, no expiry
Text, image and audio workflows
Usage-based credit billing
Online playground
API key management
Request usage & credit history

Volume

$1,000

For higher usage at the same unit rate.

10,000,000 credits, no expiry
Text, image and audio workflows
Usage-based credit billing
Online playground
API key management
Request usage & credit history

A closer look at Kimi K31 Pro

What is Kimi K31 Pro?+

Kimi K31 Pro is the independent playground and API service at k31.pro for Moonshot AI’s Kimi K3.1 Pro model, routed through OpenRouter.

Does Kimi K31 Pro understand audio natively?+

On this service, Kimi K31 Pro accepts audio through speech-to-text preprocessing. OpenRouter currently lists native text, image and video inputs for the model. Audio transcription is an additional processing step, and its cost is included in usage billing.

How much does Kimi K31 Pro cost?+

Kimi K31 Pro uses credits based on actual usage, with a temporary reservation before a request. New accounts receive 10 credits. Existing credit packs and subscription plans are available on the pricing page.

How do I sign in to Kimi K31 Pro?+

Use Google to sign in to Kimi K31 Pro. Email verification-code sign-in is currently disabled.

Is Kimi K31 Pro an official Moonshot AI website?+

Kimi K31 Pro is an independent service. It is not affiliated with or endorsed by Moonshot AI. The upstream model is provided through OpenRouter.

What can I upload to Kimi K31 Pro?+

Kimi K31 Pro supports PNG, JPEG and WebP images, supported videos and audio recordings. Embedded files are limited to 4 MiB each, 8 MiB total and 8 files per conversation. Audio is transcribed before inference.

Your next idea starts with Kimi K31 Pro.

Bring a question, a picture or a spoken thought to Kimi K31 Pro. Give the full idea a place to begin.

Try Kimi K31 Pro