Kimi is the AI assistant from the Chinese company Moonshot AI, which became known for early support of very long texts and then released very large open-weight models. Kimi's main difference from an ordinary chatbot is its focus on "work": multi-step research, building slides and documents, and an agent that runs tools itself and delivers a finished output. The international version is in English, and the version inside China has a separate address.

What is Kimi good for?#

  • Reading long documents: A student uploads several PDF papers at once and gets a comparative summary and a list of sources.
  • Deep research: An online shop manager wants a competitor market report, and Kimi browses dozens of web pages and writes a sourced report.
  • Building slides and documents: From a topic or file, it makes a presentation ready for a meeting that can then be edited.
  • Agentic tasks: In agent mode, it writes and runs code, builds a web page or analyzes data.
  • Coding: Developers use Kimi models in coding tools and the command line, and there is a specialized coding version too.

Strengths and weaknesses#

Strengths:

  • Good handling of very long texts and files
  • A strong agent and deep research in the free version (with caps)
  • Open-weight models among the largest openly released
  • An API compatible with common standards and usually cheaper than US competitors

Weaknesses:

  • Writing in languages other than English and Chinese is weaker than the best-known assistants
  • Data is processed on a Chinese company's servers
  • Its open-weight models are too large to run on a personal computer

Free version and pricing#

Kimi is freemium. Chat and simple search are available in the free version, and heavier features such as the agent, deep research and slide generation have limited quotas. A paid membership raises the quotas. The API for developers is billed by usage. Check the official site for current prices.

Language support#

Kimi understands many languages and replies in them, but its text can be stiff. The best use for non-native English speakers is to have it read English sources and give a summary in their own language; then edit the text yourself.

Getting started in three steps#

  1. Open the international version of the site and sign up with email or a Google account.
  2. Choose chat mode for a simple question and research or agent mode for a detailed report.
  3. Don't treat the agent's output as final; check the sources and numbers yourself.

Kimi alternatives#

  • DeepSeek: simpler and more popular for chat and reasoning.
  • Qwen: free, with broader language coverage and small models for local use.
  • GLM: another open-weight Chinese rival, focused on coding and agents.
  • Claude: more precise for working with long documents and for careful writing.

To understand agents better, read what is an AI agent and how it differs from a chatbot, and for working with long files, working with long documents using AI: summarize, ask and compare.