Kimi K2 Thinking

MoonshotAI· released 6 Nov 2025

moonshotai/kimi-k2-thinking

Input / 1M tokens: $0.6
Output / 1M tokens: $2.5

Context window262K tokens

Longest answer: 236K tokens

reads textopen weightstool callingreasoning

About

Kimi K2 Thinking is a text reasoning model from MoonshotAI, with tool support and open weights. It accepts text and returns text. Its context window is 262,144 tokens, with a maximum output of 235,929 tokens. The listed summary presents it as an extension of the K2 line into agentic, long-horizon reasoning and notes its Mixture-of-Experts architecture. The model ID is moonshotai/kimi-k2-thinking, and its Hugging Face ID is moonshotai/Kimi-K2-Thinking. MoonshotAI is its maker and lab, and its family is moonshotai. Released on 2025-11-06, it costs USD 0.6 per 1M input tokens and USD 2.5 per 1M output tokens. Its official listing is at https://openrouter.ai/moonshotai/kimi-k2-thinking.

Who it is for

This model may suit teams building text-based reasoning workflows that use tools and need a long context or substantial output. Its open weights may also matter to builders choosing an open-weight model.

What is good

Open weights are available
Reasoning and tools are supported
262,144-token context window
Maximum output of 235,929 tokens

What to know first

Text-only inputs and outputs
Output costs USD 2.5 per 1M tokens

Verdict

Kimi K2 Thinking offers reasoning and tool support, open weights, and a 262,144-token context window. Its listed output price is USD 2.5 per 1M tokens, compared with USD 0.6 per 1M input tokens.

Details

Lab: MoonshotAIopenrouter.ai · 3 Oct 2026
Context: 262Kopenrouter.ai · 3 Oct 2026
Input price: $0.6 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $2.5 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 235,929 tokensopenrouter.ai · 3 Oct 2026
Inputs: textopenrouter.ai · 3 Oct 2026
Open weights: Yesopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/moonshotai/kimi-k2-thinking· checked 3 Oct 2026