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What is Kimi K2 Thinking?

Kimi K2 Thinking is an advanced open-source reasoning model developed by Moonshot AI, specifically designed for complex, multi-step workflows where it adeptly merges chain-of-thought reasoning with the use of tools across various sequential tasks. It utilizes a state-of-the-art mixture-of-experts architecture, encompassing an impressive total of 1 trillion parameters, though only approximately 32 billion parameters are engaged during each inference, which boosts efficiency while retaining substantial capability. The model supports a context window of up to 256,000 tokens, enabling it to handle extraordinarily lengthy inputs and reasoning sequences without losing coherence. Furthermore, it incorporates native INT4 quantization, which dramatically reduces inference latency and memory usage while maintaining high performance. Tailored for agentic workflows, Kimi K2 Thinking can autonomously trigger external tools, managing sequential logic steps that typically involve around 200-300 tool calls in a single chain while ensuring consistent reasoning throughout the entire process. Its strong architecture positions it as an optimal solution for intricate reasoning challenges that demand both depth and efficiency, making it a valuable asset in various applications. Overall, Kimi K2 Thinking stands out for its ability to integrate complex reasoning and tool use seamlessly.

What is K2 Horizon?

K2 Horizon consists of a collection of six open models, namely the 375B-A23B, 36B-A4B, 32B, 7B, 3.7B, and 0.9B, each meticulously designed to excel in specific areas such as reasoning, mathematics, coding, agentic tasks, and overall functional capabilities. These models are built upon a cohesive architecture that incorporates a shared vocabulary, training methodologies, interfaces, evaluation frameworks, and deployment tools, which enable smooth transitions between different model sizes and effective management of varying workloads. Leading the lineup, the 375B-A23B model excels in complex reasoning, software development, research endeavors, and long-term agentic operations, whereas the 32B and 36B-A4B models emphasize strong local deployment capabilities. The 36B-A4B model is distinguished by its cutting-edge Mixture-of-Value Attention mechanism, which fuses sparse attention with Mixture-of-Experts layers, enabling it to utilize around 4 billion parameters per token, thereby closely rivaling the performance of the denser 32B model. This innovative architecture not only enhances versatility but also optimizes resource utilization across a diverse array of applications, making K2 Horizon a formidable presence in the field of model technology. Additionally, the collective strengths of these models allow for a comprehensive approach to tackling various challenges within their respective domains.

Media

Media

Integrations Supported

GPT-5
GPT-5.1
GPT-5.1 Instant
GPT-5.1 Thinking
GPT-5.2
GPT-5.2 Instant
GPT-5.2 Thinking
GPT-5.3 Instant
GPT-5.4
GPT-5.4 Pro
GPT-5.5
GPT-5.6 Sol
GPT-5.6 Terra
GPT-6 Astra
Hugging Face
Nebius Token Factory
OpenClaw
Oxlo.ai
Shiori
Zo Computer

Integrations Supported

GPT-5
GPT-5.1
GPT-5.1 Instant
GPT-5.1 Thinking
GPT-5.2
GPT-5.2 Instant
GPT-5.2 Thinking
GPT-5.3 Instant
GPT-5.4
GPT-5.4 Pro
GPT-5.5
GPT-5.6 Sol
GPT-5.6 Terra
GPT-6 Astra
Hugging Face
Nebius Token Factory
OpenClaw
Oxlo.ai
Shiori
Zo Computer

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Open source
Free Version
Free Trial Offered?

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Moonshot AI

Date Founded

2023

Company Location

United States

Company Website

moonshotai.github.io/Kimi-K2/thinking.html

Company Facts

Organization Name

Institute of Foundation Models

Date Founded

2025

Company Location

United States

Company Website

ifm.ai/blog/k2/

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