Kimi

Yes, Kimi is completely free to use with generous context window and message limits. A Pro plan from $19 per month unlocks higher limits and priority access during peak hours, while the free tier remains one of the most generous among long-context AI chatbots.

Kimi supports up to 2 million tokens of context in a single conversation, one of the longest context windows available in any AI chatbot. This allows it to process very long documents, entire codebases, or multiple files at once.

Yes, Kimi excels at document analysis thanks to its long context window. You can upload multiple lengthy documents and ask questions across all of them, making it ideal for research and document review.

Kimi was developed by Moonshot AI and is particularly strong in Chinese language understanding and generation, while also performing well in English. It is one of the best options for Chinese-language AI tasks.

Yes, Kimi supports file uploads including PDF, Word, Excel, and other common document formats, and can analyze and answer questions about the content within its long context window.

Kimi offers a longer context window (2 million tokens vs 200K for Claude) and is free, while Claude generally provides more nuanced reasoning and better instruction following. Kimi is better for processing very long documents, Claude for complex analysis.

Kimi is the specialist to reach for when the task is a document problem rather than a chat problem. Its context window reaches up to 2 million tokens in a single conversation, enough to hold entire books, full codebases, or hundreds of pages of research in one pass. Typical high value jobs include contract review, literature synthesis, transcript analysis, and codebase understanding, and it answers in both Chinese and English with particular strength on Chinese content. For general chat and broad everyday use, a general-purpose assistant still fits better.

Moonshot publishes flat token pricing for the Kimi K3 generation: $3 per million input tokens, $15 per million output tokens, and $0.30 per million cached input tokens. Cached repeats are the budget lever for production workloads that re-send long documents.

Yes. Web search integration is built in, so Kimi can pull current pages into an answer and combine them with uploaded documents. That makes it practical for research briefs that need both live sources and your own reference files in one thread.

Kimi handles code understanding, review, and multi-step reasoning across large files, and the 2 million token context lets it hold several modules of code at once. For quick editor autocomplete a dedicated coding assistant feels snappier, but for whole-project analysis Kimi is a strong free option.

Kimi is built by Moonshot AI, a Beijing based model lab. The assistant is free to use, and the underlying models are also served through an API that developers use for long-document and agent workloads.

Yes. You can upload several documents, from PDFs to code files, and ask questions that span all of them in the same thread. This cross-file workflow is where the long context window pays off most compared with assistants that truncate after a few uploads.