MoonshotAI: Kimi K2 0905

by MoonshotAI

Kimi K2 0905 is the September update of [Kimi K2 0711](moonshotai/kimi-k2). It is a large-scale Mixture-of-Experts (MoE) language model developed by Moonshot AI, featuring 1 trillion total parameters with 32 billion active per forward pass. It supports long-context inference up to 256k tokens, extended from the previous 128k. This update improves agentic coding with higher accuracy and better generalization across scaffolds, and enhances frontend coding with more aesthetic and functional outputs for web, 3D, and related tasks. Kimi K2 is optimized for agentic capabilities, including advanced tool use, reasoning, and code synthesis. It excels across coding (LiveCodeBench, SWE-bench), reasoning (ZebraLogic, GPQA), and tool-use (Tau2, AceBench) benchmarks. The model is trained with a novel stack incorporating the MuonClip optimizer for stable large-scale MoE training.

Avg Score

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Pricing

$0.39

input

$1.90

output

per 1M tokens

Context

262K

tokens

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Other Models from MoonshotAI

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Model	Score	Latency	Cost/1M
MoonshotAI: Kimi K2 Thinking	82.4%	10.2s	$1.07
MoonshotAI: Kimi K2 0711	—	—	$0.0000
MoonshotAI: Kimi K2 0711	—	—	$1.45
MoonshotAI: Kimi Dev 72B	—	—	$0.72

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Quickstart

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View on OpenRouter

import { OpenRouter } from "@openrouter/sdk";

const openrouter = new OpenRouter({
  apiKey: "<OPENROUTER_API_KEY>"
});

const completion = await openrouter.chat.completions.create({
  model: "moonshotai/kimi-k2-0905",
  messages: [
    {
      role: "user",
      content: "Hello!"
    }
  ]
});

console.log(completion.choices[0].message.content);

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