Moonshot AI Reasoning

Kimi K2 Thinking

Open-source reasoning model for step-by-step thinking

Reasoning Context window

Text + Vision Modalities

Reasoning Specialty

Yes Streaming

Get API key — free View docs →

Model ID kimi-k2-thinking /v1/chat/completions

Our pricing

Input tokens per 1M tok

$0.400

Output tokens per 1M tok

$1.68

Pay-as-you-go · No minimums · Cancel anytime

OpenAI-compatible ( api.belugapi.com/v1)

Start for free →

No credit card required to test

Capabilities

What Kimi K2 Thinking
can do for you.

Native API parity with the official provider — every feature surfaced one-to-one.

Streaming

Server-sent events out of the box

Vision

Analyze images, charts & documents

Function calling

Parallel & nested tool calls

Reasoning

Deep chain-of-thought for hard tasks

Integration

2-line migration.
Zero friction.

BelugAPI is 100 % compatible with the OpenAI SDK. Point base_url to our endpoint and you're done — no refactoring, no learning curve.

Same request & response schema

Python · Node.js · REST · Go · Ruby

Streaming, tool-calling, structured output

Automatic failover & load balancing

Python

from openai import OpenAI

client = OpenAI(
  api_key=bel-your-key,
  base_url=https://api.belugapi.com/v1
)

response = client.chat.completions.create(
  model=kimi-k2-thinking,
  messages=[{"role": user, "content": Hello!}]
)
print(response.choices[0].message.content)

Node.js

import OpenAI from openai;

const client = new OpenAI({
  apiKey:  bel-your-key,
  baseURL: https://api.belugapi.com/v1,
});

const res = await client.chat.completions.create({
  model:    kimi-k2-thinking,
  messages: [{ role: user, content: Hello! }],
});
console.log(res.choices[0].message.content);

cURL

curl https://api.belugapi.com/v1/v1/chat/completions \
  -H Authorization: Bearer bel-your-key \
  -H Content-Type: application/json \
  -d {"model":"kimi-k2-thinking","messages":[{"role":"user","content":"Hello!"}]}

Highlights

Built for production.

Reasoning

Tool use

Complete guide

Everything about
Kimi K2 Thinking.

Specifications, pricing, capabilities, and integration tips — kept up to date with every Moonshot AI release.

By Moonshot AI 2 min read Updated May 2026

Open-source reasoning model for step-by-step thinking

Overview

Kimi K2 Thinking is a cutting-edge ai reasoning model developed by Moonshot AI, designed to push the boundaries of artificial intelligence-powered content generation. Released as an open-source model, it empowers developers, researchers, and enterprises to build custom solutions without licensing restrictions.

This model excels in reasoning, tool use, making it a top choice for professionals seeking high-quality, scalable AI solutions. Whether you're building production applications, researching new AI capabilities, or creating stunning visual content, Kimi K2 Thinking delivers industry-leading performance and reliability.

Key Specifications

Specification	Details
Model Name	Kimi K2 Thinking
Provider	Moonshot AI
Category	AI Reasoning Model
Model Type	Reasoning
Context Window	256K

Pricing

Input: $0.4/M tokens
Output: $1.68/M tokens

Key Features & Capabilities

Reasoning: Advanced capability for professional-grade output.
Tool Use: Advanced capability for professional-grade output.

Use Cases & Applications

Complex problem solving
Scientific research assistance
Mathematical computation
Multi-step workflow automation

Frequently asked questions

What is Kimi K2 Thinking best used for?

Kimi K2 Thinking excels at reasoning, tool use, making it ideal for professional and enterprise applications.

Who developed Kimi K2 Thinking?

Kimi K2 Thinking was developed by Moonshot AI, a leading AI research and development company.

How do I integrate Kimi K2 Thinking into my application?

You can integrate Kimi K2 Thinking via its official API endpoint using standard HTTP requests with your API key. SDKs are available for Python, JavaScript, and other languages.

What is the pricing model for Kimi K2 Thinking?

Pricing is based on input. Check the pricing section above for detailed rates.

Ready to ship? Start using Kimi K2 Thinking in under 30 seconds.

Get free API key