Kimi K3.1 Pro

Kimi K3.1 Pro

Moonshot AI
Pythia

Pythia

EleutherAI
+
+

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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

Pythia combines interpretability analysis and scaling laws to understand how knowledge develops and evolves during training in autoregressive transformers.

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 Not Supported
Mac Not Supported
Linux Not Supported
Cloud 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 developers

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

EleutherAI
Founded: 2020
eleuther.ai

Alternatives

Alternatives

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Alpaca

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Chinchilla

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GPT-6.1 Sol

GPT-6.1 Sol

OpenAI
Falcon-40B

Falcon-40B

Technology Innovation Institute (TII)
Kimi K2

Kimi K2

Moonshot AI
GPT-NeoX

GPT-NeoX

EleutherAI
Kimi K3

Kimi K3

Moonshot AI
VideoPoet

VideoPoet

Google

Categories

Categories

AI Models Supported

Integrations

.NET Supported
Bash Supported
C# Supported
Cherry Studio Supported
Cloudflare Supported
Fireworks AI Supported
Forefront Not Supported
Hermes Agent Supported
Java Supported
Kimi Supported
Kimi Work Supported
Novita AI Supported
OpenTag Supported
PrivatClaw Supported
Python Supported
Scala Supported
Shiori Supported
Together AI Supported
TypeScript Supported
Unity AI Gateway Supported

Integrations

.NET Not Supported
Bash Not Supported
C# Not Supported
Cherry Studio Not Supported
Cloudflare Not Supported
Fireworks AI Not Supported
Forefront Supported
Hermes Agent Not Supported
Java Not Supported
Kimi Not Supported
Kimi Work Not Supported
Novita AI Not Supported
OpenTag Not Supported
PrivatClaw Not Supported
Python Not Supported
Scala Not Supported
Shiori Not Supported
Together AI Not Supported
TypeScript Not Supported
Unity AI Gateway Not Supported
Claim Kimi K3.1 Pro and update features and information
Claim Kimi K3.1 Pro and update features and information
Claim Pythia and update features and information
Claim Pythia and update features and information