Kimi K3.1 Pro Reviews & Ratings

Kimi K3.1 Pro

5.0 out of 5 stars

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What is Kimi K3.1 Pro?

Kimi K3.1 Pro is a multimodal large language model developed by Moonshot AI to support advanced reasoning, autonomous AI agents, software development, 3D creation, and complex knowledge work. The model is based on a mixture-of-experts architecture containing approximately 2.8 trillion total parameters and 104 billion active parameters. Its one-million-token context window enables the processing of extensive documents, source code repositories, technical materials, and long-running task histories. Kimi K3.1 Pro builds on the Kimi K3 foundation with additional reinforcement learning and post-training optimization across programming, analytical reasoning, and agentic tasks. Its software engineering capabilities include code generation, debugging, terminal operations, automated testing, application development, and multistep problem-solving across existing repositories. The model can develop interactive websites, animated interfaces, browser-based 3D environments, and game projects using tools and frameworks such as Three.js, Unity, Unreal Engine, and Godot. Its multimodal reasoning capabilities allow it to interpret images, sketches, and visual references when generating technical designs or structured outputs. Three-dimensional modeling features include CAD script generation, parametric geometry creation, asset modification, and integration with tools such as Blender. Financial reasoning capabilities support complex spreadsheet models, financial statement analysis, investment research, cross-document verification, and evidence-based reporting. Kimi K3.1 Pro also supports tool-assisted workflows in which AI agents plan tasks, execute actions, evaluate results, and refine outputs across multiple steps. The model is available through Kimi's web and mobile applications, Kimi Work, Kimi Code, and the Kimi API, with a Highspeed variant providing faster inference and an open-weight release planned for November 4, 2026.

What is Jurassic-1?

Jurassic-1 features two distinct model sizes, with the Jumbo variant being the most expansive at 178 billion parameters, showcasing the highest level of intricacy among language models available to developers. Presently, AI21 Studio is undergoing an open beta phase, encouraging users to sign up and start engaging with Jurassic-1 via a user-friendly API and an interactive online platform. At AI21 Labs, we aim to transform the way individuals interact with reading and writing by incorporating machines as cognitive partners, a vision that necessitates collaborative efforts to achieve. Our journey into the realm of language models began during what we call our Mesozoic Era (2017 😉). Building on this initial research, Jurassic-1 represents the first series of models we are now making available for widespread public use. Looking ahead, we are eager to witness the innovative ways in which users will harness these technological advancements in their creative endeavors. Furthermore, we believe that this collaboration between humans and machines will unlock new frontiers in communication and expression.

Media

Media

Integrations Supported

APIFree
C#
ClinePass
Cosmos
Factory Droid
HTML
Kimi Claw
Kimi Code
Kimi Code CLI
Lua
Nebius Token Factory
Objective-C
OpenCode
OpenCode Go
OpenTag
Pi Agent
Ruby
Swift
XML
ZooClaw

API Availability

Has API

API Availability

Pricing Information

$2 per 1M tokens
API usage is pay-as-you-go: $2 per million input tokens and $10 per million output tokens. Cached input is $0.20 per million tokens; cache writes are $2 per million tokens. Kimi Code also provides tier-based membership access, with quotas and context limits depending on the tier.

Pricing Information

Pricing not provided

Supported Platforms

SaaS
Windows
Mac
On-Prem
Linux

Supported Platforms

SaaS
Windows
Mac
On-Prem
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Moonshot AI

Date Founded

2023

Company Location

China

Company Website

www.kimi.ai/

Company Facts

Organization Name

AI21 Labs

Date Founded

2017

Company Location

Israel

Company Website

www.ai21.com/blog/announcing-ai21-studio-and-jurassic-1

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

AI Reasoning Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

Open-Weight AI Models

Not specified

Categories and Features

AI Models

Not specified

Large Language Models

Not specified

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