Moonshot AIReleased July 1, 2025

Moonshot Kimi k2

Open Source#8 Arena Rank1T MoE parameters

Context

131K

Input

$0.55

Key Specifications

🏆

Arena Rank

#8

📐

Context Window

131K

📥

Input Price

per 1M tokens

$0.55

📤

Output Price

per 1M tokens

$2.20

🧠

Parameters

1T MoE

🔓

Open Source

Yes

Best For

Codingagentic tasksreasoning

About Moonshot Kimi k2

Moonshot Kimi k2 is a massive open-source model with 1 trillion mixture-of-experts parameters, making it one of the largest openly available AI models. Developed by Chinese AI startup Moonshot AI (creators of the popular Kimi chatbot), it rivals frontier proprietary models on coding and agentic benchmarks while being freely accessible. The model uses an efficient MoE architecture where only a fraction of parameters activate per token, keeping inference costs manageable despite its enormous size. Kimi k2 excels at code generation, tool use, and multi-step reasoning tasks. Its release represents a significant milestone in open-source AI, demonstrating that the community can produce models competitive with the largest proprietary systems.

Pricing per 1M tokens

Input Tokens

$0.55

Output Tokens

$2.20

Compare Moonshot Kimi k2

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Frequently Asked Questions

What is Moonshot Kimi k2?▾
Moonshot Kimi k2 is a massive open-source model with 1 trillion mixture-of-experts parameters, making it one of the largest openly available AI models. Developed by Chinese AI startup Moonshot AI (creators of the popular Kimi chatbot), it rivals frontier proprietary models on coding and agentic benchmarks while being freely accessible. The model uses an efficient MoE architecture where only a fraction of parameters activate per token, keeping inference costs manageable despite its enormous size. Kimi k2 excels at code generation, tool use, and multi-step reasoning tasks. Its release represents a significant milestone in open-source AI, demonstrating that the community can produce models competitive with the largest proprietary systems.
How much does Moonshot Kimi k2 cost?▾
Moonshot Kimi k2 costs $0.55 per 1 million input tokens and $2.20 per 1 million output tokens. Pricing is based on token usage, making it cost-effective for both small and large-scale applications.
What is Moonshot Kimi k2's context window?▾
Moonshot Kimi k2 has a context window of 131K tokens. This determines how much text the model can process in a single request — larger context windows allow the model to handle longer documents, maintain more conversation history, and reason over bigger codebases.
Is Moonshot Kimi k2 open source?▾
Yes, Moonshot Kimi k2 is open source. This means the model weights are publicly available, allowing developers and organizations to download, fine-tune, and self-host the model on their own infrastructure. Open-source models offer greater flexibility and data privacy control.
What is Moonshot Kimi k2 best for?▾
Moonshot Kimi k2 is best suited for: Coding, agentic tasks, reasoning. These use cases leverage the model's specific strengths in terms of capability, speed, and cost-effectiveness within Moonshot AI's model lineup.