Kimi K3.1 Pro

Kimi K3.1 Pro

Moonshot AI
Leanstral

Leanstral

Mistral AI
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About

Kimi K3.1 Pro is a multimodal large language model developed by Moonshot AI for advanced reasoning, software development, 3D modeling, financial analysis, and autonomous AI agent workflows. The model uses a mixture-of-experts architecture with approximately 2.8 trillion total parameters and 104 billion active parameters, supporting a context window of one million tokens. Its coding capabilities include debugging existing applications, generating complete software projects, developing interactive websites, and creating applications with game engines. Kimi K3.1 Pro can analyze images, interpret spatial relationships, generate CAD scripts, and create three-dimensional assets from text descriptions or visual references. Its reasoning and tool-use capabilities support financial modeling, investment research, document analysis, and multistep business workflows. The model is available through Kimi's web and mobile applications, Kimi Work, Kimi Code, and the Kimi API, with a Highspeed variant.

About

Leanstral is an open-source code agent developed by Mistral AI specifically designed to work with the Lean 4 proof assistant. The model focuses on generating code while also formally verifying its correctness against strict mathematical or software specifications. Unlike traditional coding assistants, Leanstral integrates directly with formal proof systems to ensure that generated code satisfies defined logical requirements. Its architecture is optimized for proof engineering tasks and operates efficiently with sparse model parameters. Leanstral is released under the Apache 2.0 license, making it freely accessible for developers, researchers, and organizations to use and customize. The model is designed to operate within real-world formal repositories rather than isolated problem environments. By combining code generation with formal verification, Leanstral aims to reduce the need for manual human review in complex software and mathematical development.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Not Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Software developers, AI engineers, researchers, financial analysts, and teams building applications or agentic workflows with AI models.

Audience

AI researchers, software engineers, and developers working with formal verification, proof assistants, and mathematically rigorous software development

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

API

Offers API Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$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.
Free Version Not Supported
Free Trial Not Supported

Pricing

Free
Open source
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Pros & Cons from Real Users

Pros

  • I can give it a large coding job, a research project, or a multi-step agent workflow and it does a much better job staying organized all the way through. Coding is probably the biggest jump. Moonshot reports a 65.7% score on Terminal-Bench 4.0, ahead of GPT-6 Astra’s reported 58.2% and just behind Claude Opus 5.5 at 66.4%. It feels especially good for terminal work, repo-level changes, and tasks where the agent has to keep using tools for a while. The 1M-token context window is also genuinely useful. I can keep a huge amount of source code, documentation, financial material, screenshots, and prior work in context without constantly trimming things down.

Cons

  • The main downside is that the full weights are not available yet. Moonshot says they will be released soon, so the open-weight story is promising, but I would wait for that release before judging local deployment and customization.

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Moonshot AI
Founded: 2023
China
www.kimi.ai/

Company Information

Mistral AI
Founded: 2023
France
mistral.ai

Alternatives

Alternatives

GPT-5.5

GPT-5.5

OpenAI
GPT-6.1 Sol

GPT-6.1 Sol

OpenAI
Claude Opus 4.6

Claude Opus 4.6

Anthropic
Kimi K2

Kimi K2

Moonshot AI
MiMo-V2.6-Pro

MiMo-V2.6-Pro

Xiaomi Technology
Kimi K3

Kimi K3

Moonshot AI
Leanstral 1.5

Leanstral 1.5

Mistral AI

Categories

Categories

AI Coding Agents Supported
AI Coding Models Supported
AI Models Supported

Integrations

APIFree Supported
C# Supported
Claude Code Supported
Cline Supported
Command Code Supported
CoreWeave Supported
Go Supported
HTML Supported
Kotlin Supported
Model Context Protocol (MCP) Supported
Offloop Supported
Okara Supported
Ollama Supported
OpenCode Go Supported
Pi Agent Supported
PrivatClaw Supported
Python Supported
Rust Supported
Scala Supported
Tabbit Browser Supported

Integrations

APIFree Not Supported
C# Not Supported
Claude Code Not Supported
Cline Not Supported
Command Code Not Supported
CoreWeave Not Supported
Go Not Supported
HTML Not Supported
Kotlin Not Supported
Model Context Protocol (MCP) Not Supported
Offloop Not Supported
Okara Not Supported
Ollama Not Supported
OpenCode Go Not Supported
Pi Agent Not Supported
PrivatClaw Not Supported
Python Not Supported
Rust Not Supported
Scala Not Supported
Tabbit Browser Not Supported
Claim Kimi K3.1 Pro and update features and information
Claim Kimi K3.1 Pro and update features and information
Claim Leanstral and update features and information
Claim Leanstral and update features and information