Kimi K2
Major release: A new general-purpose AI model from a leading lab, the kind behind ChatGPT, Claude or Gemini: a new flagship or generation.Open model: Its files are public (open weights), so anyone can download it and run it on their own computer, usually for free.
Key facts
- Released
- Jul 11, 2025
- What it does
- Text and chat: Writes, answers questions and holds a conversation.Code: Writes, explains and fixes code.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.
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- How
- Free to download, with some licence limits
- Size
- Parameters: The numbers a model learns during training: a rough measure of its size. Bigger usually means more capable, but slower and pricier to run. 7B means 7 billion.
- Announced as
- “Kimi K2: Open Agentic Intelligence”
From trckr's archive of releases before it started watching. Date and details from Epoch AI's database of AI models (CC BY 4.0).
Price and limits
What developers pay to use it through the API: How developers plug a model into their own apps and pay per use. A model that's "in the API" can be used by programmers, even if it isn't in a chat app yet., per million Tokens: The small chunks of text a model reads and writes, about three-quarters of a word each. Prices and limits are counted in tokens. sent (input) or written back (output), and how much it can take in at once.
- Input
- $0.57
- per million tokens
- Output
- $2.30
- per million tokens
- Context window: How much a model can keep in mind at once: your question, any files you share and its own replies. Measured in tokens; 1,000 tokens is about 750 words.
- 131K tokens
- about 98,000 words
From OpenRouter, checked .
How it scores
From independent testers, never the lab's own claims.
Compare Kimi K2 with
It came out 25 days after Kimi Dev 72b, the lab's previous model.
The details
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