Kimi

Moonshot AI

An AI assistant from Moonshot AI, known for ultra-long context. Its Kimi K2 model family (2025) is released as open weights on GitHub.

Product preview

Overview

Kimi is Moonshot AI's assistant, best known for pushing context length to extremes — early versions famously handled millions of Chinese characters in a single conversation. That makes it a favorite for digesting very long documents: contracts, novels, financial filings and multi-file code repositories.

The core experience is free, with file uploads, web search and a polished mobile app. Its open K2 model releases have also made it popular with developers who want frontier-adjacent long-context ability they can self-host.

Pros / Cons

Pros

Exceptionally long context — millions of characters in one conversation
Strong Chinese-language understanding and generation
Free core experience with file and web features
Open K2 model releases for self-hosting

Cons

English and other non-Chinese quality trails the global leaders
Fewer integrations and plugins than Western platforms
Peak-hour speed limits on the free tier

Who it's for

Summarizing and querying very long Chinese documents

Academic and legal document analysis

Whole-repository code review in one conversation

Bottom line

The long-context specialist — the first pick for very long Chinese documents and rising fast elsewhere.

Key Features

Ultra-long context

Document understanding

Multi-turn chat

Open-weight K2 models

Compare Kimi with alternatives

Kimi vs ChatGPT Kimi vs Claude Kimi vs Gemini 4 products · Conversational AI

Frequently asked questions

What is Kimi?

Kimi is a Conversational AI tool developed by Moonshot AI. The company was founded in 2023 and is headquartered in Beijing, China. An AI assistant from Moonshot AI, known for ultra-long context. Its Kimi K2 model family (2025) is released as open weights on GitHub.