月之暗面Web · iOS · Android
Chinese assistant known for very long context — feed it whole document sets at once
We deliberately put “not for” on the same screen — a review that only lists strengths carries no information.
Free quota plus paid plans; see the official site.
Editorial opinion, not an aggregated user rating. Data last verified: 2026-09-29.
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You are still comparing. See where this tool sits in the landscape before committing an afternoon to it.
Form factor：conversational
Moonshot AI launches Kimi, a long-context assistant built for very long documents.
https://en.wikipedia.org/wiki/Moonshot_AIMoonshot AI open-sources Kimi K2, a 1-trillion-parameter MoE model aimed at agents.
https://en.wikipedia.org/wiki/Moonshot_AISolid dots mark events whose subject is this tool; hollow dots mark events that mention it. All entries come from this site's timeline, where every event carries a reachable source.
First release: not stated. Not derived automatically. The earliest timeline event mentioning this tool may be a version milestone, a different product with the same name, or a passing mention rather than a launch; each needs checking against an official source, so this is left empty.
We have not published a hands-on review of Kimi yet. This entry is a structured summary; the in-depth review will appear here.
OpenAI
The largest general assistant by user base, with the most complete ecosystem
Free; Plus USD 20/mo; Pro USD 200/mo; Team USD 25/user/mo; Enterprise custom.
Anthropic
Strong long-document comprehension and writing quality; Projects can hold a knowledge base
Free; Pro USD 20/mo; Max USD 200/mo; Team USD 25/user/mo; Enterprise custom.
This page is an editorial summary, not an official page. Trademarks and product names belong to their respective owners. If anything here is wrong or out of date, tell us and we will correct it. Last verified: 2026-09-29.